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Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
SECTION 2: OPERATION
A.
PREOPERATIONAL CHECKS
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CAUTION: BEFORE USING THE EQUIPMENT, THE OPERATOR
MUST CAREFULLY READ THE INSTRUCTIONS IN THE SAFETY
SECTION OF THIS MANUAL AND IN THIS SECTION. THE
OPERATOR MUST ALSO BECOME FAMILIAR WITH THE TOW
TRACTOR’S CONTROLS, INDICATORS, AND EQUIPMENT AS
DESCRIBED IN TABLES 2-1 thru 2-7 OF THIS SECTION.
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NOTE: In temperatures below 40 °F (4.4 °C), ensure that units with an
engine coolant heater option are connected to engine external power source 1
hour prior to engine starting and operation.
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Note
NOTE: In temperatures below 40 °F (4.4 °C), ensure that in units with an
engine fuel heater option, heaters are operating 10 minutes prior to engine
starting and turned off before ENGINE STOP/RUN switch is placed in the
RUN position.
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CAUTION: NEVER RUN THE ENGINE WITH RECEPTACLE
CONNECTED TO THE OPTIONAL ENGINE COOLANT HEATER. A
FLOW CHECK VALVE STOPS COOLANT FLOW THROUGH THE
HEATER WHILE THE ENGINE IS RUNNING. THE HEATER WILL BE
DAMAGED IF CONNECTED TO THE HEATER RECEPTACLE WHILE
THE ENGINE IS RUNNING.
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In order to ensure safe, reliable operation, perform the following checks prior to operating the tractor:
Ensure the park brake switch is applied (set to ON).
2.
Walk around the tractor and inspect it for damage or missing equipment.
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Check for damaged or under-inflated tires. Check that cold tire pressure is 130 psi
(896.3 kPa). Look for cuts and cracks in the tire’s sidewalls and for foreign objects in the
tread.
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4.
Check the front/rear axle differential cases and planetary hubs for oil leaks.
5.
Check for proper operation of the hitches.
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Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
Check for damage to the vehicle’s lights and beacons. Check that all lights are in proper
working order.
7.
Check that the fire extinguishers are in place and fully charged .
8.
Look underneath the tractor for signs of leaking coolant, hydraulic fluid, transmission fluid,
or lubricating oil. If significant leaks are found, repair them before using the unit for regualar
operation.
9.
Check the engine oil.
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WARNING: DO NOT LOOSEN OR REMOVE THE RADIATOR CAP
WHEN THE COOLANT IS HOT. HOT COOLANT UNDER PRESSURE
CAN SPRAY OR BOIL OUT, CAUSING SEVERE BURNS.
Check that the engine coolant level is approximately 1-1/2 in (4 cm) below top of radiator fill
neck. If not, add coolant as necessary, being careful not to overfill. Visually check for
coolant leaks.
11.
Inspect the engine compartment for loose hardware, loose wires, and leaking lines or fittings.
12.
Check the hydraulic fluid level in the sight glass on the hydraulic reservoir. The sight glass is
slightly above eye level on the driver’s side of the vehicle between the front and rear axles. A
very low fluid level indicates a serious leak in the system. If that is the case, find the leak and
repair it immediately.
13.
Check the operation of the hazard flasher, stoplights, taillights, headlights, backup lights, and
dash panel lights.
14.
Check the fuel level.
NOTE: By keeping the fuel tank as full as possible, the tendency for
moisture to condense on the inner surfaces of the fuel tank can be minimized
or eliminated. Top off the fuel tank at the end of the day’s operation as part
of the post-operation maintenance routine.
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CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
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CAUTION: IF THE EMERGENCY STEERING PUMP IS OPERATED
FOR MORE THAN 1 MINUTE, ITS MOTOR MAY OVERHEAT AND BE
DAMAGED. DO NOT OPERATE THE EMERGENCY PUMP ANY
LONGER THAN NECESSARY.
Place one hand on the steering wheel and the other on the Emergency Steering switch.
Depress the switch and hold it down while turning the steering wheel a quarter turn or less in
each direction. Listen to the pump’s operation. The steering wheel should turn effortlessly
and the feel and sound should be smooth. Release the switch.
16.
Start the engine. With the (foot) brake pedal depressed, cycle the transmission through all
gears and allow transmission to reach 160 °F (71.8 °C). Return to neutral and check the
transmission’s oil level. Add oil as required but do not overfill.
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TOW TRACTOR CONTROLS, INDICATORS AND OPERATIONAL EQUIPMENT
Table 2-1 lists the front cab controls, indicators, and equipment not found on the instrument
panel and explains the specific function of each. Reference Figure 2-1 for location of the
items listed.
2.
Table 2-2 lists the front cab instrument panel controls and indicators and explains the specific
function of each. Reference Figure 2-2 for location of the items listed.
3.
Figure 2-3 Steering Mode Selection Display.
4.
Table 2-4 lists Cab Select Plate controls and indicators and explains the specific function of
each. Reference Figure 2-4 for location of the items listed.
5.
Table 2-5 lists the rear operator station option controls, indicators, and equipment not found
on the instrument panel and explains the specific function of each. Reference Figure 2-5 for
location of the items listed.
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Table 2-6 lists the rear operator station instrument panel controls and indicators and explains
the specific function of each. Reference Figure 2-6 for location of the items listed.
1-2-3
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Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
1. Front cab controls, indicators, and equipment.
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Figure 2-1. Front Cab Controls, Indicators and Equipment
1-2-4
Orig
CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
Table 2-1. Front Cab Controls, Indicators and Equipment
Parking Brake Switch
4
Transmission Shift Selector
5
Horn Button
6
Turn Signal and Hazard Switch
Intercom Plug, Front Bumper
17
Front Hitch Light
18
Heater/Defroster Unit
19
Headlight, R/H
20
Turn Signal/Parking Light, R/H
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Fuse Box
22
Warning Beacon
23
Dome Light
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Headlight, L/H
11
Brake Pedal
12
Accelerator Pedal
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Disk Horn, 24V, Low Note
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Emergency Engine Shutdown Switch This switch shuts down the engine in a emergency. To
use, press down on the red buttin. To reset, pull up the
button.
Instrument Panel, Front Cab
Refer to Figure 2-2 for desriptions of the instrument panel
controls and indicators.
Turn Signal/Parking Light, L/H
The turn signals flashes when the turn signal/hazard
switch is set to signal a turn or hazard. The parking light
will illuminate steadily when the parking lights switch is ON.
15
The headlight illuminates the area in front of the tractor
when the headlights switch is in LO or HI and the parking
light switch is ON.
The brake pedal is foot operated and located in the front of
operator and to the left of accelerator pedal. Pushing on it
engages the service brakes.
The accelerator pedal is foot-operated and located in the
front of operator and to the right side of the brake pedal. It
regulates the speed of engine.
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Cab Ventilation Fans
This is high tone, disk style sound making device. This
horn is used to warm others of the approach of the
vehivle or of its presence.
They provide cooling air circulation when activated by
the integral swithes.
This is low tone, disk style sound making device. This
horn is used to warm others of the approach of the
vehivle or of its presence.
This intercom plug accepts a communication cable
linking the aircraft and the tow tractor.
This light illuminates the front hitch when the front hitch
light switch is ON.
It provides front cab heating and windshield defrosting.
Its two-speed blower is controlled by the blower fan
switch.
The headlight illuminates the area in the front of the
tractor when the headlights switch is in LO or HI and
the parking light switch is ON.
The turn signals flash when the turn signal/hazard
switch is set to signal a turn or hazard. The parking
light illuminates steadily when the parking lights switch
is ON.
The fuse box contains fuses, relay and circuit breaker
for electrical system circuit protection.
The operator actuated beacon alerts others that the
tow tractor is in operation.
When turned ON by an integral switch, the dome light
illuminates the cab's interior.
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Intercom Plug, Front Cab
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This mehanical gauge indicates the hydraulic system
pressure
The front cab intercom plug is interconnected to plugs
located inside rear operator station (optional), on the front
bumper, and on the rear bumper
This switch is used to set the parking brake. To set the
parking brake, move switch to ON position and observe
that the parking brake applied indicators are illuminated.
To release the parking brake, move the switch to OFF
position.
The transmission shift selector selects the direction of
travel and speed range of the tractor.
The horn button is located in the center of steering wheel
and sounds the horns. To sounds the horns, push in on
the botton
This switch controls the turn signals and hazard warning
lights. To indicate a left turn, pull the arm down. To
indicate a right turn, push the arm up. The arm must be
manually returned to the center position (OFF) after each
turn. To actuate the hazard lights, pull outward (away from
the steering wheel) on the tab, located directly behind the
turn signal switch arm. To turn off the hazard lights, push
up or pull down on the turn signal switch arm until the tab
pops back into position.
DESCRIPTION
Disk Horn, 24V, High Note
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Hydraulic System Pressure Gauge
NAME
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ITEM
DESCRIPTION
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ITEM NAME
1-2-5
Orig
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
2. Front cab instrumental panel controls and indicators.
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Figure 2-2. Front Cab Instrument Panel
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CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
Table 2-2. Front Cab Instrument Panel
ITEM
NAME
DESCRIPTION
Emergency Engine Stop Button
This shuts down the engine in an emergency situation.
Press down on the button to stop the engine. To reset,
pull up on the button.
2
Left Turn Indicator
This light illuminates when the left turn signal is on.
3
Low Oil Pressure Light
This light illuminates whenever the engine oil pressure
drops below 5.8 psi (39.99 kPa).
4
Engine Fault Light
This light illuminates whenever the engine experiences
a fault condition
5
Glow Plug Light
This light illuminates whenever the glow plugs come on
and goes out when they reach the proper temperature.
The engine is then ready to start.
6
Alternator No Charge Light
This light illuminates when the alternator is not
charging the electrical system.
7
Dash Panel Lights
8
Multifunction LCD Display Panel
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The dash panel lights are used to illuminate the
instrument panel during low-light conditions. These
lights automatically turn on when the Parking/Headlight
Switch is turned on.
The multifunction LCD display shows vehicle and
engine data gauges including: tachometer, vehicle
speed, fuel level, coolant temperature, oil pressure and
transmission oil temperature. The display will also
show the user if any engine or transmission fault codes
are present as well as give a description of the
fault.When the tractor is in reverse, the display will
change to show the rear view camera.
9
Transmission Warning Light
This light illuminates when a problem occurs with the
transmission.
10
Four-Wheel Steering System
Warning Light
This light illuminates when a problem occurs with the
four-wheel steering system.
11
High Beam Indicator
This light tells the operator that high beam headlights
are selected.
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Chapter 1
Section 2
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GT110 (24V0 Aircraft Tow Tractor
Figure 2-2. Front Cab Instrument Panel (Cont'd)
1-2-8
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CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
Table 2-2. Front Cab Instrument Panel (Cont'd)
NAME
DESCRIPTION
Parking Brake Applied Light
This light illuminates whenever the parking brake is
engaged.
13
Right Turn Indicator
This light illuminates when the right turn signal is on.
14
Transmission Display
This displays gear selection, fault codes, and other
information from the transmission. (See ZF operation
manual located in Chapter 5.)
15
Engine Diagnostic Connector
This connector attaches the Deutz programming cable to
the port. (Only performed by an authorized Deutz or
TUG representative. See the Deutz service manual in
Chapter 5 for more details.)
16
Front Cab Lift Switch (Optinal)
This switch lifts and lower front cab. Push and hold the
switch as indicated to raise or lower the cab.
17
Headlight Mode Switch
18
Parking/Headlight Switch
19
Amber Beacon Switch
20
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ITEM
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Rear Hitch Light Switch
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CD389
Front Hitch Light Switch
This switch selects the headlight mode. Pressing the
switch to the upper position turns on the low beams and
the lower position turns on the high. The headlights are
turned on/off using the Parking/Headlight Switch.
This 3-position switch controls the headlights and
parking lights. The upper position turns off all lights, the
middle position will illuminate the parking and dash
lights. The lower position turns on the headlights.
This switch controls the amber beacon. Pressing the
lower side of the rocker switch turns the hitch light on.
Pressing the upper side of the switch turns it off.
This switch controls the rear hitch light when the tractor is
being operated from the front cab. Pressing the lower
side of the rocker switch turns the hitch light on. Pressing
the upper side of the switch turns it off.
This switch controls the front hitch light. Pressing the
lower side of the rocker switch turns on the light.
Pressing the upper side of the switch turns it off.
1-2-9
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Chapter 1
Section 2
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GT110 (24V0 Aircraft Tow Tractor
Figure 2-2. Front Cab Instrument Panel (Cont'd)
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CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
Table 2-2. Front Cab Instrument Panel (Cont'd)
ITEM
NAME
DESCRIPTION
Emergency Steering Pump Switch
This switch activates the emergency steering pump.
Press and hold the switch to start the pump. Release the
switch to stop it. The steering pump activates only if the
hydraulic system pressure is below 1800 psi. Do NOT
press and hold the switch for more than 1 minute!
23
Rear Window Defroster Switch
This momentory switch operates the rear window
defroster. Press once to turn the defroster ON. The
switch has timer relay that will turn the defroster OFF
after 9-12 minutes. It can alse be manually turned OFF
by pressing the defroster switch a second time.
24
Blower Heater Fan Switch (Optinal) The front cab's blower fan is controlled by this switch.
The blower fan is used to heat the cab and has a HIGH
and LOW speed position.
25
Heated Mirror Switch
26
Windshield Washer Switch
27
Windshield Wiper Switch
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Switch, Starter
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CD389
This momentory switch operates the heated mirrors.
Press once to turn the heated mirrors ON, press again to
turn it OFF.
Pressing and holding this switch will activate the
windshield washers. Once the switch is released, the
washers turn off.
This 3-position switch controls the windshield wipers.
The upper position turns the wipers on low speed, the
middle position turns the wipers OFF. The lower position
turns the wipers on high speed.
The starter switch starts and stops the engine and
connects and disconnects the electrical controls. The
switch has three positions: STOP, RUN, and START.
Moving the switch from STOP to RUN energizes the
electrical system. Moving the switch from RUN to
START starts the engine. (Once the engine starts, release
the switch.) To stop the engine, place the transmission in
neutral, set parking brake ON, and turn the switch to
STOP.
1-2-11
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Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
3. Front cab steering display.
LCD
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(Four-Wheel
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Figure 2-3. Front Cab Steering Display
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The steering terminal allows the user to interact with the four wheel stering system. From this terminal
the operator can select a steering mode, view rear axle position/mode, and obtain diagnostic information
for the steering system.
1-2-12
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CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
4. Front cab select plate.
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NAME
DESCRIPTION
Indicator, Front Cab
Indicator light shows that front cab is selected
2
Indicator, Rear Operator Station
Indicator light shows that rear operators station is selected
3
Indicator, Shifters In Neutral
This green indicator illuminates if both front and rear
transmission sheifters are in Neutral
4
Indicator, Front Park Brake Switch Thes red light is on if the front parking brake switch is set to
On
ON and the Stop, Run, Start switch is in RUN
5
Indicator, Rear Park Brake Switch
On
Thes red light is on if the rear parking brake switch is set to
ON and the Stop, Run, Start switch is in RUN
6
Indicator, Park Brake Applied
This red light comes on if the parking brake is applied and
the STOP, RUN, START switch is in RUN
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Figure 2-4. Front Cab Select Plate
7
Indicator, Rear Shifter Not In
Neutral
This red light indicates that the front shifter is not in Neutral
8
Cab Select Switch
This switch shifts operational control from the front cab to
rear ooperator station. It transfers control of the accelerator,
parking brake, transmission, and steering; hower, service
brake control remains active in both cabs regardless of
which cab is selected.
Table 2-4. Front Cab Select Plate
CD389
1-2-13
Orig
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
5. Rear operator station controls, indicators, and equipment.
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Figure 2-5. Rear Operator Station Controls, Indicators and Equipment
1-2-14
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CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
Table 2-5. Rear Operator Station Controls, Indicators and Equipment
ITEM
NAME
DESCRIPTION
Headlight, L/H
The headlight illuminates the area in back of the tractor
when the rear headlights switch is in activated.
2
Reverse Light, L/H
The reverse light is ON when front cab shifter is in reverse
position
3
Brake Light, L/H
The brake light is on when front cab brake pedal is pushed.
4
Turn/Hazard Light, L/H
The turn signals flash when the turn signal/hazard switch is
set to signal a turn or hazard. The parking light illuminates
steadily when the parking lights switch is ON.
5
License Plate Holder
License plate is to be installed on this holder.
6
Fire Extinguisher
20lb fire extinguisher. In case of emergency follow
instructions located on the fire extiguisher
7
Intercom Plug, Front Cab
The rear operator compartment intercom plug is
interconnected to plugs located inside front cab and on the
front bumper.
8
This switch shuts down the engine in an emergency
Emergency Engine Shutdown Switch situation. Press down on the red button to stop engine. To
reset, pull up the button.
9
The horn button is located in the center of steering wheel
and sounds the horns. To sound the horns, push in on the
botton
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Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
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Figure 2-5. Rear Operator Station Controls, Indicators and Equipment (Cont'd)
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Orig
CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
Table 2-5. Rear Operator Station Controls, Indicators and Equipment (Cont'd)
ITEM
NAME
DESCRIPTION
Transmission Shift Selector
The transmission shift selector selects the direction of
travel and speed range of the tractor.
11
Rear Hitch Light
This light illuminates the rear hitch when the rear hitch
light switch is ON.
12
Instrument Panel, Rear
Operator Station
Refer to Figure 2-4 for descriptions of the instrument
panel controls and indicators.
13
Turn/Hazard Light, R/H
The turn signals flash when the turn signal/hazard
switch is set to signal a turn or hazard. The parking light
illuminates steadily when the parking lights switch is
ON.
14
Brake Light, R/H
The brake light is on when front cab brake pedal is
pushed.
15
Reverse Light, L/H
The reverse lights is ON when front cab shifter is in
reverse position
16
Headlight, R/H
17
Brake Pedal
18
Accelerator Pedal
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The headlight illuminates the area in the back of the
tractor when the rear headlights switch is activated.
The brake pedal is foot operated and located in the
front of operator and to the left of accelerator pedal.
Pushing on it engages the service brakes.
The accelerator pedal is foot-operated and located in
the front of operator and to the right side of the brake
pedal. It regulates the speed of engine.
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1-2-17
Orig
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
6. Rear operator station instrument panel.
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Figure 2-6. Rear Operator Station Instrument Panel
1-2-18
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CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
Table 2-6. Rear Operator Station Instrument Panel
NAME
DESCRIPTION
1
Steering Terminal
2
Transmission Display
This displays gear selection, fault codes, and other
information from the transmission. (See ZF operation
manual located in Chapter 5.)
3
Glow Plug Light
This light illuminates whenever the glow plugs come on
and goes out when they reach the proper temperature. The
engine is then ready to start.
4
Alternator No Charge Light
This light illuminates when the alternator is not charging
the electrical system.
5
Low Oil Pressure Light
This light illuminates whenever the engine oil pressure
drops below 5.8 psi (39.99 kPa).
6
Engine Fault Light
7
Transmission Warning Light
8
Four-Wheel Steering System
Warning Light
9
Indicator, Front Shifter Not In
Neutral
This red light indicates that the front shifter is not in
Neutral
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ITEM
This green indicator illuminates if both front and rear
transmission sheifters are in Neutral
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The steering terminal allows the user to interact with the
four wheel steering system. From this terminal the operator
can select a steering mode, view rear axle position/mode,
and obtain diagnostic information for the steering system.
(See Fig. 2-3 this Section)
Indicator, Shifters In Neutral
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This light illuminates whenever the engine experiences a
fault condition
This light illuminates when a problem occurs with the
transmission.
This light illuminates when a problem occurs with the fourwheel steering system.
11
Indicator, Front Park Brake Switch
On
12
Indicator, Rear Park Brake Switch On This red light is on if the rear parking brake switch is set to
ON and the Stop, Run, Start switch is in RUN
CD389
This red light is on if the front parking brake switch is set
to ON and the Stop, Run, Start switch is in RUN
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Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
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Figure 2-6. Rear Operator Station Instrument Panel (Cont'd)
1-2-20
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CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
Table 2-6. Rear operator Station Instrument Panel (Cont'd)
ITEM
NAME
DESCRIPTION
Indicator, Park Brake Applied
This red light comes on if the parking brake is applied
and the STOP, RUN, START switch is in RUN
14
Parking Brake Switch
This switch is used to set the parking brake. To set the
parking brake, move switch to ON position and observe
that the parking brake applied indicators are illuminated.
To release the parking brake, move the switch to OFF
position.
15
Cab Select Switch
This switch shifts operational control from the rear cab to
front cab. It transfers control of the accelerator, parking
brake, transmission, and steering; hower, service brake
control remains active in both cabs regardless of which
cab is selected.
16
Indicator, Rear Operator Station
Indicator light shows that rear operators station is
selected
17
Indicator, Front Cab
Indicator light shows that front cab is selected
18
Rear Hitch Light Switch
19
Emergency Steering Pump Switch
20
Rear Work/Headlight Switch
The rear work/ headlights are turned on/off using the
Rear Work/Headlight Switch.
Emergency Engine Stop Button
This shuts down the engine in an emergency situation.
Press down on the button to stop the engine. To reset,
pull up on the button.
The dash panel Light is used to illuminate the instrument
panel during low-light conditions. This light
automatically turns on when Parking/Headlight Switch is
turned on
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This switch controls the rear hitch light when the tractor
is being operated from the rear cab. Pressing the lower
side of the rocker switch turns the hitch light on.
Pressing the upper side of the switch turns it off.
22
CD389
Dash Panel Light
This switch activates the emergency steering pump.
Press and hold the switch to start the pump. Release the
switch to stop it. The steering pump activates only if the
hydraulic system pressure is below 1800 psi. *Do NOT
press and hold the switch for mor
1-2-21
Orig
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
7. Rear cab controls, indicators and equipment
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Figure 2-7 Rear Cab Controls, Indicators and Equipment
1-2-22
Orig
CD389
GT110 (24V0 Aircraft Tow Tractor
Chapter 1
Section 2
Table 2-7 Rear Cab Controls, Indicators and Equipment
ITEM
NAME
Description
Intercom Plug, Rear Cab
The rear cab intercom plug is interconnected to plugs located
inside the front cab, on the front bumper, and on the rear
bumper
2
Horn Button
The horn button located in the center of the steering wheel,
sounds the horns when pushed.
3
Emergency Stop
Pulling up on this button will execute an emergency stop on the
engine. To reset the emergency stop button, push down on it.
4
Park Brake Switch
This switch sets the parking brake. Put the switch to ON position
to set the parking brake. Observe that the rear parking brake ON
and park brake applied indicators are illuminated. Put switch to
the OFF position to release the parking brake.
5
Rear Cab Instrument Panel
Refer to Figure 2-8 for description of the instrument panel
controls and indicators
6
Stop/Park/Turn/BackUp Light
Set, RH
This stop/ turn signal element flashes when the turn
signal/hazard switch (item #6, Table 2-1) is set to signal a turn or
hazard. The stop/turn element illuminates when the service
brakes are applied. The parking element illuminates when the
park lights are turned on. The backup light illuminates when the
front cab shift selector is set to reverse.
7
Intercom Plug, Rear Bumper
8
Dash Panel Light
9
Transmission Shifter
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10 Stop/Park/Turn/BackUp Light
Set, LH
11 Service Brake Pedal
CD389
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This intercom plug accepts a communication cable linking an
aircraft and tow tractor.
The dash panel light illuminates the instrument panel in low-light
conditions.
The transmission shift selector selects the direction of travel of
the tractor. When operating from the rear cab, the speed range
of the tractor is four forwards and three reverse gears
The stop/turn signal element flashes when the turn signal/hazard
switch (item #6, Table 2-1) is set to signal a turn or hazard. The
stop/turn element illuminates when the service brakes are
applied. The parking element illuminates when the park lights
are turned on. The backup light illuminates when the front cab
shift selector is set to reverse (R).
The service brake pedal is in front of and to the right of the
operator. It actuates the service brake system and operates
similarly to an automobile brake pedal.
1-2-23
Orig
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
8. Rear cab dash panel
14
13
12
11
7
7
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3
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Figure 2-8 Rear Cab Dash Panel
1-2-24
Orig
CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
Table 2-8 Rear Cab Dash Panel
ITEM
DESCRIPTION
12
1
Engine Fault Light
This light illuminates whenever the engine experiences a fault
condition
2
Emergency Engine
Stop Button
This shuts down the engine in an emergency situation. Press down
on the button to stop the engine. To reset, pull up on the button.
13
Left Turn Indicator
This light illuminates when the left turn signal is on.
14
4
Low Oil Pressure
Light
This light illuminates whenever the engine oil pressure drops below
5.8 psi (39.99 kPa)
15
Glow Plug Light
This light illuminates whenever the glow plugs come on and goes
out when when they reach proper temperature. The engine is then
ready to start
CD389
Transmission Warning
Light
Rear Cab Select Plate
This panel has steering terminal (Fig. 2-3)
17
Parking Brake Applied
Light
This Light illuminates whenever the parking brake is engaged.
18
Four Wheel Sreering
System Warning Light
This light illuminates when a problem occurs with four wheel
steering system.
19
Emergency Steering
Pump Switch
This switch activates the emergency steering pump. Press and hold
the switch to start the pump. Release the switch to stop it. The
steering pump activates only if the hydraulic system pressure is
below 1800 psi. Do NOT press and hold the switch for more
than 1 minute!
20
Blower Heater Fan
Switch
The rear cab's blower fan is controlled by this switch. The blower
fan is used to heat the cab and has a HIGH and LOW speed
position.
21
Windshield Washer
Switch
Pressing and holding this switch will activate the windshield
washers. Once the switch is released, the washers turn off.
Windshield Wiper Switch
This3-position switch controls the windshield wipers. The upper
position turns the wipers on low speed, the middle position turns
the wipers OFF. The lower position turns the wipers on high speed.
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This light illuminates when a problem occurs with the transmission
10
High Beam Indicator
This light tells the operator that high beam headlights are selected.
11
Right Turn Indicator
This light illuminates when the right turn signal is on.
This panel allow to select operation of the unit from front cab (Fig.
2-9)
Faceplate 4 Wheel
Steering Display
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Multifunction LCD
Display Panel
The multifunction LCD Display shows vehicle and engine data
gauges including: tachometer, vehicle speed, fuel level, coolant
temperature, oil pressure and transmission oil temperature. The
display will also show the user if any engine or transmission fault
codes are present as well as give a description of the fault.
Headlight Mode Switch
This switch selects the headlight mode. Pressing the switch to the
upper position turns on the low beams and the lower position turns
on high. The headlights turned on/off using the Parking/Headlight
Switch
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The dash panel lights are used to illuminate the instrument panel
during low-light conditions.
Parking/Headlight Switch
This 3-position switch controls the headlights and parking lights.
The upper position turns OFF all lights, the middle position will
illuminate the parking and dash lights. The lower position turns on
headlights.
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Dash Panel Lights
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This light illuminates when the alternator is not charging the electric
system.
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Alternator No Charge
Light
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5
Transmission Display
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3
DESCRIPTION
This displays gear selection, fault codes, and other information
from the transmission. (See ZF operation manual located in
Chapter 5.)
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NAME
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ITEM
NAME
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1-2-25
Orig
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
9. Rear cab select panel.
Table 2-9 Rear Cab Select Plate
3
4
ITEM
2
Indicator, Rear Operator Station
Indicator light shows that rear operators station is selected
3
Indicator, Shifters In Neutral
This green indicator illuminates if both front and rear
transmission sheifters are in Neutral
4
Indicator, Front Park Brake
Switch On
Thes red light is on if the front parking brake switch is set
to ON and the Stop, Run, Start switch is in RUN
Indicator, Rear Park Brake Switch
On
Thes red light is on if the rear parking brake switch is set
to ON and the Stop, Run, Start switch is in RUN
6
Indicator, Park Brake Applied
This red light comes on if the parking brake is applied and
the STOP, RUN, START switch is in RUN
7
Indicator, Front Shifter Not In
Neutral
This red light indicates that the front shifter is not in
Neutral
Cab Select Switch
This switch shifts operational control from the front cab to
rear ooperator station. It transfers control of the
accelerator, parking brake, transmission, and steering;
hower, service brake control remains active in both cabs
regardless of which cab is selected.
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Indicator light shows that front cab is selected
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Indicator, Front Cab
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DESCRIPTION
1
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5
6
NAME
Figure 2-9 Rear Cab Select Plate
1-2-26
Orig
CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
C.
1.
FRONT CAB OPERATOR'S SEAT
The standard operator and passenger suspension seat (Figure 2-10) features several
adjustments for the operator’s comfort and to position the seat for optimum access to all
controls.
Lumbar Adjustment. To make the lumbar adjustment, turn knob until the seat is in desired
position. Note symbols on knob (+ or - ) to increase or decrease, and turn knob in the desired
direction.
Back Angle Adjustment. To adjust backrest to the desired angle, turn knob until the backrest
is in the desired position. Turning the knob in the clockwise direction will angle the seat to
the rear, and turning the knob counterwise will angle the seat back more forward.
3.
Height Control Adjustment. To adjust height of seat to the desired position, turn knob as
indicated by the plus (+) symbol to increase height of seat or turn knob in the direction of the
minus (-) symbol to lower the seat.
4.
Fore/Aft Adjustment. To move the seat fore or aft, pull the handle to the left, hold in position,
slide the seat to the desired position, and release the handle.
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2.
BACKREST ADJUSTMENT
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REAR HEIGHT
AND INCLINATION
ADJUSTMENT
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AND INCLINATION
ADJUSTMENT
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WEIGHT ADJUSTMENT
HORIZONTAL ADJUSTMENT
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LUMBAR
ADJUSTMENT
FORE/AFT
ADJUSTMENT
BACK ANGLE
ADJUSTMENT
HEIGHT CONTROL
ADJUSTMENT
FORE/AFT
ADJUSTMENT
FRONT
SIDE
Figure 2-10. Front Cab Seats
CD389
1-2-27
Orig
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
The optional operator and passenger Scissor suspension seat (Figure 2-11) features several
adjustments for the operator’s comfort and to position the seat for optimum access to all
controls.
Height Control Adjustment. To adjust height of seat to the desired position, turn knob as
indicated by the plus (+) symbol to increase height of seat or turn knob in the direction of the
minus (-) symbol to lower the seat.
2.
Fore/Aft Adjustment. To move the seat fore or aft, pull the handle to the left, hold in position,
slide the seat to the desired position, and release the handle.
FORE/AFT
ADJUSTMENT
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1.
HEIGHT CONTROL
ADJUSTMENT
FORE/AFT
ADJUSTMENT
FRONT
SIDE
Figure 2-11. Front Scissor Cab Seats (Optional)
1-2-28
Orig
CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
D.
OPERATIONAL PROCEDURES
WARNING: NEVER OPERATE CONTROLS FROM OUTSIDE
OPERATOR’S COMPARTMENT. SEVERE PERSONAL INJURY OR
DEATH CAN RESULT.
Starting Procedure
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1.
WARNING: ENSURE THAT ALL PERSONNEL ARE CLEAR OF THE
TOW TRACTOR BEFORE STARTING THE ENGINE.
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WARNING: DO NOT ATTEMPT TO ADJUST THE SEAT WHILE THE
TRACTOR IS IN MOTION. LOSS OF TRACTOR CONTROL MAY
RESULT.
Adjust the operator’s seat so that all controls may be comfortably reached.
(b)
Verify that the parking brake switches are set to ON and the shift selector is in neutral
(N), and the emergency stop button is not activated.
(c)
Check that all other switches are OFF.
(d)
Turn the STOP, RUN, START switch clockwise to RUN. The glow plug light will
illuminate.
(e)
Wait for the glow plug light to extinguish. This is a signal that the engine is ready to
start.
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CAUTION: TO AVOID OVERHEATING OF STARTER MOTOR, DO NOT
OPERATE STARTER MOTOR MORE THAN 30 SECONDS WITHOUT
ALLOWING A MINIMUM COOLING PERIOD OF 2 MINUTES.
CD389
1-2-29
Orig
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
(f)
Turn the STOP, RUN, START switch to START.
(g)
Start the engine and then check the engine oil pressure gauges and the voltmeter.
Observe that they are within limits. Ensure that all warning indicators are
extinguished.
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NORMAL OPERATING CONDITIONS
NORMAL
Temperature
Engine Oil Pressure
Transmission Fluid Temperature
Voltmeter
185-200°F (85-93 °C)
30-90 psi (241-621 kPa)
160-210 °F (71-99°C)
+24 Volts
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SYSTEM
Allow the engine to idle for approximately 5 minutes (warm up).
(i)
Turn on all necessary system switches (lights, etc.) for the operation. An operational
check of all accessory systems should be performed at this time, ensuring they
operate properly.
(j)
Turn the steering wheel until the wheels are in the straight-ahead position. Set the
steering mode select switch to the desired steering mode.
(k)
Depress the foot brake pedal. Release the parking brake by setting the parking brake
switch to OFF and wait until the PARK BRAKE indicator light extinguishes.
(l)
Select the desired direction of travel and speed range by placing the shifter in the gear
most appropriate for the speed and weight of the tow.
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WARNING: DO NOT SHIFT TRANSMISSION WHILE HANDLING
AIRCRAFT.
Release the foot brake pedal and slowly depress the accelerator pedal.
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(m)
1-2-30
Orig
CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
2.
Parking Brake Operation
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WARNING: ALWAYS SET THE PARKING BRAKE ON BEFORE
SHUTTING OFF THE ENGINE OR EXITING THE CAB. FAILURE TO
SET THE PARKING BRAKE CAN RESULT IN THE TRACTOR
ROLLING AWAY, CAUSING SEVERE PERSONAL INJURY, DEATH,
AND/OR PROPERTY DAMAGE.
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CAUTION: THE PARKING BRAKE MUST BE RELEASED BEFORE
THE TRACTOR IS MOVED. EXCEPT IN AN EMERGENCY
SITUATION, DO NOT APPLY THE PARKING BRAKE WHILE THE
TRACTOR IS IN MOTION. PARKING BRAKE DAMAGE WILL OCCUR.
To set the park brake, move the parking brake switch to the ON position, and observe
that the park brake applied indicator illuminates.
(b)
To release the park brake, move the parking brake switch to the OFF position, and
observe that the park brake applied indicator turns off.
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NOTE: The parking brake must be released (set to OFF) before any forward
or reverse gear is selected via the transmission shift selector. If not, the horn
will sound as a warning.
The remote hand pump, located above the passenger side ballast compartment,
provides a means of releasing the parking brake should the main piston pump and the
emergency pump fail. To use the emergency hand pump, follw these steps:
Push down on the black knob and rotate clockwise.
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(2)
CD389
Remove the handle from its storage location and insert it into the hand pump.
(3)
Pump until 1800 psi is shown on the gauge. DO NOT EXCEED 2500 psi.
(4)
To reactivate the park brake, push down on the knob and rotate counterclockwise.
1-2-31
Orig
Chapter 1
Section 2
Transmission Range Selection
The transmission selector is an electronic control unit with a stick type selector.
There is a forward and reverse selector side for the transmission selector. The selector
control normally resides in the neutral position. The desired direction of travel is
always selected starting from the neutral position. Forward gears are selected by
depressing the button on top of the shifter joystick and pushing it forward. Pushing
the joystick to the right will up-shift and pushing it to the left will down shift. The
desired gear can be observed on the gauge on the dash. Reverse is done in the
opposite manner. Depressing the button on top of the joystick and pulling back on it,
will select Reverse 1. To up-shift, follow the same procedures as for selecting a
forward gear. Note there are 4 forward speeds and 2 reverse speeds.
(b)
The ZF Powershift transmission must be manually shifted into the desired gear. Use
the gear most appropriate for the conditions. Shift to the next higher speed when the
top speed in any particular gear is reached. Do not tow farther than 6.2 miles (10 km)
or faster than 6 mph (10 km/hr). Only tow aircraft in first or second gear.
(c)
Generally, up shifting and down shifting is best accomplished by shifting through the
normal sequence of speeds. Downshifting will produce a braking effect, unless the
engine is stopped. In that case, no braking will occur.
(d)
Stop the tractor before shifting into any reverse speed.
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3.
GT110 (24V0 Aircraft Tow Tractor
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CAUTION: DO NOT COAST THE TOW TRACTOR IN NEUTRAL.
DOING SO MAY RESULT IN SEVERE DAMAGE TO THE
TRANSMISSION.
Neutral (N). Select Neutral when starting the engine, when checking the tractor’s
accessories, and when idling the engine for extended periods. Use NEUTRAL with
the parking brake set if leaving the tractor unattended with the engine running.
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CAUTION: NEVER SHIFT FROM ANY FORWARD GEAR TO REVERSE
OR FROM REVERSE TO ANY FORWARD GEAR WHILE THE
TRACTOR IS IN MOTION. THE TRACTOR CAN BE DAMAGED OR
STOP SUDDENLY.
(f)
1-2-32
Orig
1-2-3-4 Range Selections. Occasionally, certain conditions make it necessary to
restrict shifting to a lower range. In addition to more pulling power at lower speeds,
these selections provide progressively greater engine braking for going down medium
grades. (The lower the gear range, the greater the braking effect.)
CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
4.
(g)
Reverse 1-2. Select a speed range in Reverse adequate to the task at hand. The
reverse gears work in the same manner as the forward speed ranges.
(h)
Rear Cab Shift Selector. The Rear Cab Shift Selector is tagged with four forward
speeds and two reverse. The third and fourth forward gears are the same. Otherwise,
the rear cab shifter operates identically to the front cab shifter.
Cab Selection
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To transfer operational control between the front and rear cabs.
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switch
Table 2-12. Cab Select Plate
CD389
1-2-33
Orig
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
WARNING: MOVING THE CAB SELECT SWITCH WHILE THE
TRACTOR IS IN MOTION CAN CAUSE THE TRACTOR TO LOSE
CONTROL, POSSIBLY RESULTING IN DEATH, SEVERE PERSONAL
INJURY, OR PROPERTY DAMAGE.
Stop the tractor.
(b)
Return the transmission shift selector to neutral (N).
(c)
Set the parking brake switch to the ON position, and observe that the park brake
applied indicator illuminates.
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To select front to rear or rear to front cab control, press the release latch (the raised
portion of the rocker switch) and press the rocker switch to make the selection. The
switch should lock in position. All controls except the service brake pedal will
transfer to the other cab. To make another cab control selection, the change must be
initiated from the cab (front or rear) that was selected.
Steering Mode Selection
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CAUTION: PRESS THE RELEASE LATCH (THE RAISED PORTION OF
THE ROCKER SWITCH) PRIOR TO MAKING A SELECTION FROM
FRONT TO REAR OR FROM REAR TO FRONT CAB CONTROL
SELECTION. FORCING THE SWITCH INTO POSITION WILL
DAMAGE THE LOCKING DEVICE, ALLOWING THE SWITCH TO BE
ACCIDENTALLY ACTIVATED.
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WARNING: BEFORE ATTEMPTING TO USE THE U-30 AIRCRAFT
TOW TRACTOR, THE OPERATOR AND ASSOCIATED GROUND
SUPPORT EQUIPMENT EMPLOYEES MUST BE TRAINED ON THE
OPERATION OF THE UNIT AND ITS STEERING MODES. ALL
PERSONNEL SHOULD REMAIN AWARE OF POSSIBLE DANGEROUS
SITUATIONS TO AVOID SERIOUS INJURY OR DEATH.
1-2-34
Orig
CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
WARNING: WHEN THE GT110 UNIT IS IN OPERATION, ALL
PERSONNEL EXTERNAL TO THE VEHICLE NEED TO MAINTAIN A
SAFE DISTANCE FROM FRONT AND REAR WHEEL WELLS TO
AVOID CONTACT WITH THE WHEELS OR BECOME TRAPPED
BETWEEN THE VEHICLE FRAME AND THE WHEEL:
SINCE THE GT110 CAN STEER WITH FOUR WHEELS, IT IS VERY
AGILE AND CAN CHANGE DIRECTION / MOVE SIDEWAYS
MUCH FASTER THAN A CONVENTIONAL ROAD VEHICLE;
·
WHEN STEERING, THE WHEELS WILL PROTRUDE OUTSIDE
THE WHEEL WELL;
·
IN CERTAIN CIRCUMSTANCES, THE WHEELS MAY ALIGN FOR
STRAIGHT AHEAD OR TURN LEFT / RIGHT EVEN WHEN THE
VEHICLE IS STATIONARY.
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THEREFORE, MAINTAINING A SAFE DISTANCE TO AVOID
CONTACT IS CRITICAL.
The steering modes are operated through a Steering Logic Controller (SLC). The SLC
contains an LCD display and eight white buttons, with blue back lighthing, to
confirm the mode selected. On the GT110 unit, only the three left white buttons on
the top row are utilized (see Figure 2-13).
(b)
When the Start/Run/Stop switch is moved from Stop to Run, the LCD display backlighting will illuminate and “TUG Technologies Corporation” will be written in the
display for a period of about 3-5 seconds. Simultaneously, the (8) blue lights will
illuminate for about 5 seconds. The company name will extinguish and two audio
beeps will be heard and all (8) lights will flash in synchronization.
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(c)
CD389
After the two audio beeps, seven of the (8) lights will extinguish and one will remain
brightly illuminated. The single blue light illuminated will be the TRACK (front
wheel steering) mode button because this is the default steering mode. If the rear
wheels are not centered at this point, the light will be flashing. There are three ways
to bring rear axle into center position.
1-2-35
Orig
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
LCD
COORD
Mode
(Four-Wheel
Steering)
CRAB
Mode
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TRACK
Mode
(Front-Wheel
Steering)
Turn the steering wheel back and forth.
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(2)
Press and hold the TRACK mode button.
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Figure 2-13. Steering Logic Controller (SLC)
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(3)
Turn off the park brake, place the tractor into gear, and start moving in either
forward or reverse. The rear axle will slowly swing into the center position
as the tractor moves.
With any of these methods, the blue light will become solid (and discontinue
flashing) when the rear axle is centered. The screen will display the image shown in
Figure 2-14, also indicating a centered rear axle.
(d)
1-2-36
Orig
With the GT-110 park brake on, and the unit running, ensure that no one is near the
tractor as the axles will be turning.
CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
<L
<L
R>
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Rear axle turned all the way to the left
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R>
Rear axle centered
Press the key pad button for the desired steering mode. If both axles are centered
then the selected mode button will be blue. If the light is flashing, press and hold the
button until this light turns solid. The steering system is now in the desired steering
mode and can be driven normally.
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Figure 2-14. Rear Axle Indicators
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Note
CD389
NOTE: Alternatively, the steering wheel can be turned back and forth or the
tractor can be placed into gear and be allowed to move. Either of these
actions will cause the rear axle to automatically align to the correct position
based on the front axle’s position.
(f)
The LCD display always shows the position of the rear axle because the rear axle is
the only axle being controlled by the steering computer. The front axle is solely
controlled by the steering wheel (i.e. the operator).
(g)
The steering mode can be changed at any time while the transmission is in first or
second gear AND the steering angle is less than 10 degrees to either the right or left.
1-2-37
Orig
Chapter 1
Section 2
The steering mode can be changed at any angle while the transmission is in neutral.
(i)
If the transmission is placed into either 3rd or 4th gear, the LCD display will give a
warning beep and will place the system into TRACK mode. If the tractor is moving,
the rear axle will lock into place the next time that the operator brings it to the center
position. If the tractor is not moving, turning the steering wheel will move the rear
axle to the center position automatically. For safety reasons, no other modes besides
TRACK mode can be used in 3rd or 4th gears due the achievable speeds in these
gears.
(j)
When the transmission is downshifted to 1st or 2nd gear, the steering mode can again
be switched to any of the three modes but will remain in TRACK mode until another
mode is chosen.
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6.
GT110 (24V0 Aircraft Tow Tractor
Front Cab Lift Operation
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To raise or lower the front cab:
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WARNING: FULLY LOWER THE CAB PRIOR TO EXITING TO AVOID
POSSIBLE INJURY.
Check that no one is entering, exiting, or close to the cab before beginning to raise or
lower the cab.
(b)
Press and hold the upper part of the CAb Lift Switch to raise the cab. Press and hold
the lower portiion of the Cab Lift Switch to lower cab.
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(a)
Once the desired cab height has been reached, release the Cab Lift Switch.
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WARNING: DO NOT LOWER THE CAB UNTIL ASSURED THAT NO
PERSONNEL ARE NEAR OR UNDERNEATH IT. DO NOT LOWER OR
RAISE THE CAB IF ANYONE ELSE IS ENTERING OR EXITING OR
WORKING NEAR THE FRONT HITCH. OTHERWISE, SEVERE
PERSONAL INJURY MIGHT RESULT.
Back Up Alarm
The back-up alarm activates automatically anytime the transmission is put into Reverse (R)
and the tractor’s START-RUN-STOP switch is in RUN. Since it is wired into the same circuit
as the back-up lights, it will sound anytime the back-up lights are on.
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CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
8.
Moving an Aircraft
Shutdown Procedure
10.
Bring the tractor to a full stop.
(b)
Place the transmission in Neutral (N).
(c)
Set the parking brake switch to ON.
(d)
Turn off all system and accessory switches.
(e)
Allow the engine to run at idle for approximately 5 minutes, then shut it down by
turning the STOP, RUN, START switch to STOP.
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(a)
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9.
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Each individual airline has established procedures for attaching the tractor to an aircraft,
detaching the tractor from an aircraft, or for towing or pushing back an aircraft. All operators
must be familiar with these procedures prior to operating the tractor in any aircraft related
operations. Aircraft should only be towed in low gear to prevent transmission/power train
overheating.
Centralized On-Board Chassis Lubrication System
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This system will automatically or manually provide lubricant to several points on the tow
tractor, including king pins, ball joints, steering cylinders, and bolsters. The system requires
manual lubrication if the lines have run out of grease or have been drained for any reason.
The lube system unit is centrally located on the front bulkhead within the engine
compartment. To manually lubricate the system, press the pushbutton located on the bottom
of the unit (Figure 2-15).
Note: Failing to allow the engine to cool down properly may cause
permanent damage to the turbocharger assembly.
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Note
CD389
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Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
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Figure 2-15. Autmatic Lubrication System Reservoir
Internal Jacking System (Option)
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(For tractors that do not have this option, please refer to Chapter 2, Section 1 for jacking
instructions).
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WARNING: BE CERTAIN THAT ALL PERSONNEL ARE CLEAR OF
THE UNDERSIDE AND ARE WELL AWAY FROM THE TRACTOR
PRIOR TO USING THE INTERNAL JACKING FEATURE.
Note: The tractor's engine must be running, the parking brake set to "ON",
and the transmission shifter must be in neutral (N) for the system to work.
Note
(a)
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To raise the tractor using the internal jacking system:
(1)
Visually ensure that personnel are not near or underneath the tractor.
(2)
Check that the parking brake is ON and that the transmission shifter is in
neutral (N). Start the engine.
CD389
Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
CAUTION: TO AVOIUD GETTING THE TRACTOR INTO POSSIBLY
UNSTABLE POSITION, DO NOT RAISE BOTH ENDS OF IT AT THE
SAME TIME.
Open the jacking system shuoff valve.
(4)
Each jacking system valve handle on the jacking system valve assembly
controls one jack. Select the valve(s) that operate(s) the desired jack(s). It is
recommended that one side of the tractor be raised at a time.
(5)
Pull out the valve handlr(s) to lower the jack(s) and raise the vechicle. Hold
the valve handle out until the tractor reaches the desired height.
(6)
Repeate steps (4) and (5) as necessary.
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(3)
Place blocks or jack stands underneath the tractor before performing any
work.
(8)
Shut down the engine (if prudent) to avoid unnecessary risk during any
maintenance procedures.
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(7)
To lower the tractor using the internal jacking system:
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(b)
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WARNING: PLACE BLOCKS OR JACK STANDS OF ADEQUATE
CAPACITY UNDERNEATH THE VEHICLE BEFORE ALLOWING
PERSONNEL TO WORK ON OR NEAR IT. DEATH OR SEVERE
INJURY COULD OTHERWISE RESULT.
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WARNING: BE CERTAIN THAT ALL PERSONNEL ARE CLEAR OF
THE UNDERSIDE AND ARE WELL AWAY FROM THE TRACTOR
PRIOR TO LOWER IT.
CD389
(1)
Visually ensure that personnel are not near or underneath the tractor.
(2)
Remove the blocks or other supporting materials from underneath the
vehicle.
(3)
Check that the transmission is still in neutral (N), parking brake is ON, and
start the engine if it has been shut down.
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Chapter 1
Section 2
GT110 (24V0 Aircraft Tow Tractor
To lower the tractor, push in the appropriate jack operating valve handle(s) as
required until tractor is completely down.
(5)
Once the tractor is lowered, push in and hold the appropriate jack handle(s)
until each jack is fully retracted.
(6)
Close the jacking system shutoff valve
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(4)
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