FE 35, 40, 55, EC 70
1
Service Manual
FE 35, FE 40, FE 55
Electric Trimmers,
EC 70 Electric Edger
As the design concept of the FE 35
and FE 40 trimmers is almost
identical, the descriptions and
servicing procedures generally apply
to both. Differences are described in
detail.
-
The motors of the FE 55 trimmer and
EC 70 edger are identical. The shafts
and drives are different and are
described separately.
- Parts of the motor must neither be
repaired nor modified in any way.
You should make use of the illustrated
parts lists while carrying out repair
work. They show the installed
positions of the individual components
and assemblies. Microfilmed parts list
are always more up to date than
printed lists.
Warning: When carrying out
repairs to electric power tools it is
essential to observe all relevant
national safety regulations and
ordinances.
Important notes:
- Every time you open the housing,
clean the motor with a soft brush.
Always use the mounting screws
specified in the parts list - other
screws must not be used.
- Always use original STIHL
replacement parts.
- Original STIHL parts can be
identified by the STIHL part
number, the STIHl logo and
the STIHL parts symbol (
The symbol may appear alone on
small parts.
A fault on the machine may have
several causes. Consult the
"Troubleshooting Chart" when
tracing faults.
Refer to the "Technical Information
Bulletins" for engineering changes
which have been introduced since
publication of this service manual.
Service manuals and technical
information bulletins are intended
exclusively for the use of STIHL
servicing dealers and staff and must
not be passed to third parties.
The STIHL Special Tools manual
lists all special servicing tools
currently available from STIHL.
STIHl
FE 35, 40, 55, EC 70
2
CONTENTS
1.
Specifications
3
3.6
Motor (FE 35, FE 40)
3.7
Carbon Brushes
1.1
Motor
3
1.2
Cutting Tool
4
1.3
Gearhead
4
Feed Mechanism
1.4
Special Accessories
5
(FE 40)
1.4.1
For User
5
1.5
Tightening Torques
5
2.
Troubleshooting
Chart
(FE 35, FE 40)
3.8
3.9
2.1
Motor
6
2.2
Mowing Head
6
3.
Electrical Circuit
7
3.2
Wiring Diagrams
3.3
(FE 35, FE 40)
3.4
3.5
(FE 55, EC 70)
Gearhead (EC 70)
23
5.2.1
Disassembly
23
26
Adjusting Automatic
5.2.2
Assembly
Feed Mechanism
5.3
Mowing Head / Motor
Fanwheel
16
3.12
Adapter
16
3.13
Strain Relief Flap
16
4.
Shaft
17
Line Feed Lever/
Activating Cord (FE 35)
18
Drive Shaft
(FE 55, EC 70)
4.5
17
Drive Tube
(FE 55, EC 70)
4.4
17
Connecting Tube /
Loop Handle
9
19
Loop Handle
(FE 55, EC 70)
10
5.2
3.11
9
Capacitor
21
(FE 35, FE 40)
4.3
Trigger / On/Off Switch /
Bearing Housing
15
4.2
Power Cable
(FE 55, EC 70)
14
20
21
(FE 55)
Motor (FE 55, EC 70)
8
On/Off Switch
5.1
Mounting Plate
7
Power Cable
(FE 35, FE 40)
13
Switch Unit of Automatic
Cutting Tool Drive
15
4.1
3.1
5.
(FE 40)
3.10
6
11
6.
28
Special Servicing
Tools and Aids
30
6.1
Special Servicing Tools
30
6.2
Servicing Aids
31
FE 35, 40, 55, EC 70
1.
1.1
3
SPECIFICATIONS
Motor
Rating:
Rated current:
Voltage:
Frequency:
Maximum speed
(without nylon line):
Fuse:
Insulation:
Radio interference
suppression:
Type of enclosure:
FE 35
FE 40
350 W
1.6 A
220 - 240 V
50 Hz
400 W
1.8 A
220 - 240 V
50 Hz
11,700 rpm
10A
Class II VIDE
11,700 rpm
10A
Class II VIDE
Level "N"
VIDE 0875
IP 20 to DIN 40050
Level "N"
VIDE 0875
IP 20
to DIN 40050
FE 55/EC70
Rating:
Rated current:
Voltage:
Frequency:
Rated speed at width
of cut, 350 mm (14 in) 1)
Maximum speed
(without nylon line):
Fuse:
Insulation:
Radio interference
suppression:
1) with
cutting blade on EC 70
600 W
2.6 A
230 V
50 Hz
650 W
2.7 A
240 V
50 Hz
660 W
5.5 A
120 V
60 Hz
8,500 rpm
8,500 rpm
8,500 rpm
13,500 rpm
10A
Class II VDE
13,500 rpm
10A
Class II VIDE
13,500 rpm
15A
Class II VDE
Conforms to EEC
directive 76/885 and
DIN 57 875
Conforms to EEC
directive 76/885 and
DIN 57 875
Conforms to EEC
directive 76/885 and
DIN 57 875
FE 35, 40, 55, EC 70
1.2
Cutting Tool
4
FE 35
FE 40
FE 55
Mowing head:
with two nylon lines
with two nylon lines
with two nylon lines
Line diameter:
1.6 mm (0.065 in)
1.6 mm (0.065 in)
2.0 mm (0.080 in)
Width of cut:
300 mm (12 in)
300 mm (12 in)
350 mm (14 in)
Nylon line in spool:
10 m (33 ft)
10 m (33 ft)
2x3.75m(2x12.3ft)
Line feed:
semi-automatic
fully automatic
semi-automatic
EC 70
Cutting blade
4133 713 4101
1.3
EC 70
Type:
Gearhead
Spiral-tooth
bevel gear drive
Gear ratio:
1.24
Bearings:
Deep-groove ball bearings
Lubrication:
STIHL gear lubricant
0781 120 1117
FE 35, 40, 55, EC 70
1.4
5
Special Accessories
1.4.1 For User
Spool with nylon line (10 m/33 ft)
4802 710 4300
1)
Replacement nylon line (15.2 m/50 ft reel)
0000 930 2515
2)
Replacement nylon line (spool) (FE 55)
4004 710 4304
4)
Shoulder strap
4130 710 9000
2)
Goggles
1.5
5)
Tightening Torques
Fastener
Thread
size
For component
Torque
Nm
lbf.ft
Tapping screw
IS-P4x19
Tapping screw
Handle
1.2
0.9
1)
IS-P4x19
Housing
1.1
0.8
1)
Tapping screw
IS-P4x35
Housing
1.2
0.9
1)
Pan head screw
M4x8
Mounting screw
1.8
1.3
1)
Tapping screw
IS-P6x19
Housing
5.5
4.0
2) 3)
Tapping screw
B3.5x9.5
Bearing housing
3.0
2.2
2)
Spline screw
IS-M5x18
Clamp on bearing housing
6.5
4. 8
2)
Spline screw
IS-M 6x20
Clamp screw in gearhead
7.5
5. 5
1) FE 35, FE 40
2) FE 55
3) EC 70
4) Not available in Europe
5) Standard equipment in some markets
Remarks
FE 35, 40, 55, EC 70
2.
TROUBLESHOOTING
CHART
2.1
Motor
6
Condition
Cause
Remedy
Motor does not run
Plug not in power outlet
Connect plug to power outlet
Carbon brushes worn
(FE 35, FE 40)
Fit new carbon brushes
Switch unit faulty (FE 40)
Replace switch unit
Motor faulty
Replace motor
2.2
Mowing Head
Condition
Cause
Remedy
Poor cutting performance
Cutting line too short
Readjust nylon line
(FE 35, FE 55)
Automatic feed mechanism
not properly adjusted
Adjust automatic feed
mechanism correctly
Does not cut
Spool empty
Fit new spool
FE 35, FE 55: Line is not
advanced when line feed
lever is operated
Spool empty
Fit new spool
Line sticking in spool
Grip ends of line and pull
firmly outward
Activating cord broken
Fit new activating cord
FE 40: Line is not advanced
even though feed process is
audible, or no click is heard
Ends of line not projecting
from spool
Pull ends of line about 10 cm
(4") out of spool
FE 40: Line is advanced too
late or too often and cut off by
line limiting blade on deflector
Automatic feed mechanism
not properly adjusted
Adjust automatic feed
mechanism correctly
FE 35, 40, 55, EC 70
3.
ELECTRICAL CIRCUIT
3.1
Wiring Diagrams
Top:
1 = Power cable
2 = Switch with capacitor
3 = Wires with flat connectors
4 = Brush holder with carbon brush
Bottom:
1 = Power cable
2 = Capacitor 1 1
3 = Switch
4 = Wires from motor
1)
Capacitor not installed
in all countries
7
Top:
1 = Power cable
2 = Switch
3 = Wires with right-angle connectors
4 = Brush holder with carbon brush
5 = Switch unit (electronic)
6 = Solenoid
FE 35, 40, 55, EC 70
8
3.2 Power Cable
(FE 35, FE 40)
Top: Handle
mounting screws
Bottom:
Removing on/off switch
1 = Screws
Top:
Cable protector
Bottom:
Correct position of power cable
1 = Cable protector
1 = Line feed lever
2 = Activating cord
Caution: The power cable must
positioned as shown so that it is not
pinched when the handle is assembled.
Make sure all wires are reconnected to
their original terminals - see 3.1.
- On FE 35, check that the activating
ord is attached to line feed lever.
Make sure that line feed lever is
properly seated in the handle molding.
- Tighten handle mounting screws to
1.2 Nm (0.9 Ibf.ft).
Warning! Always unplug the unit from the
power supply before performing any
servicing or repair work.
- Take the power cable out of the handle
molding and slip the cable protector off
the end of the cable.
- Take out the handle mounting screws.
Remove the two halves of the handle
from the connecting tube.
Installation is a reversal of the removal
sequence.
- Lift the on/off switch out of its seat,
remove the screws and pull the wires
out of the switch.
Note: Pay special attention to the
following points.
- The cable protector must be properly
engaged and the power cable correctly
positioned in the handle molding.
Warning! Always use only the handle
molding mounting screws specified in
the parts list.
- On FE 35, check smooth action of
line feed lever.
FE 35, 40, 55, EC 70
3.3
On/Off Switch
(FE 35, FE 40)
9
3.4
Power Cable
(FE 55, EC 70)
Top:
Removing wires (FE 40)
Top:
Housing mounting screws
Top: Correct position of on/off
switch
Bottom:
On/off switch (FE 35)
1 = Capacitor
Bottom:
Removing on/off switch
1 = Connector tabs
Bottom: Correct
position of
connecting wires
- Disconnect the power cable from the
on/off switch - see 3.2.
- Use a thin pointed tool (e.g. scriber) to
push back the clamping springs in the
switch and then pull the wires out of the
switch.
Installation is a reversal of the removal
sequence.
Note: Fit wires by pushing them into the
openings in the switch.
- Take out housing mounting
crews and remove the righthand housing molding.
- Pull the on/off switch out of its
seat in the left-hand housing
molding and pull the two wires
off the connector tabs.
- Remove wires of power cable from
the left-hand housing molding.
Installation is a reversal of the removal
sequence.
- Fit on/off switch in its seat and check
that it is properly located.
- Position connecting wires correctly in
housing molding.
FE 35, 40, 55, EC 70
10
3.5
Cable protector
Trigger / On/Off Switch /
Capacitor
(FE 55, EC 70)
Top:
Removing trigger
Bottom:
Connectors on switch
1 = On/off switch
2 = Push-on distributor
3 = Capacitor
- Pull the push-on distributors off
the connector tabs on the switch
and remove the capacitor.
Caution: The power cable must
positioned as shown so that it is not
pinched when the handle is assembled.
Make sure both wires are reconnected to
their original terminals - see 3.1.
Installation is a reversal of the
removal sequence.
- The cable protector The cable
protector must be properly engaged in
the housing recess.
Important: All wires must be
reconnected to their original
terminals - see 3.1.
- Tighten housing molding mounting
screws to 5.5 Nm (4.0 Ibf.ft).
Warning! Always use only the housing
molding mounting screws specified in the
parts list.
- Remove the right-hand housing
molding - see 3.4.
- Remove the trigger.
- Pull the on/off switch out of its seat in
the left-hand housing molding and
disconnect all wires from the connector
tabs and the push-on distributors.
FE 35, 40, 55, EC 70
3.6
11
Motor (FE 35, FE 40)
Top:
1 = Retaining lug
2 = Deflector shield
Bottom:
Clamp nut
Top:
Housing mounting screws
Bottom:
Activating cord on line feed
lever (FS 35)
- Use a screwdriver to lift the retaining
lug on the deflector shield a little and
then pull off the deflector shield.
- Remove housing mounting screws
and lift away the upper housing
molding.
- Unscrew the clamp nut from the
housing.
- Disconnect the activating cord from
the adjusting lever.
Top:
Removing the solenoid
1 = Actuating pin
2 = Iron core
Bottom:
Removing the iron core
- On FE 40, remove the solenoid from
the mounting plate and pull the
actuating pin out of the iron core at the
same time.
- Pull the iron core out of the solenoid
and put solenoid to one side.
FE 35, 40, 55, EC 70
12
Top:
1 = Adjusting lever
2 = Actuating pin
Top:
Connections on motor
Bottom:
Lifting motor out of housing
Bottom:
Housing slots
- Pull the actuating pin out of the
adjusting lever.
- Lift the motor with mowing head out
of the housing.
- Pull the connectors off the motor.
Note: The mowing head and mounting
plate have to be removed to replace the
motor -see 5.3.
Installation is a reversal of the removal
sequence.
Note: Pay special attention to the
following points.
Top:
Correct position of cable
(FE 35)
Bottom:
Correct position of wiring
(FE 40)
- The mounting plate must engage the
housing slots.
- Position wires in the notches in the
housing web.
- Fit the connecting tube - see 4.2.
FE 35, 40, 55, EC 70
13
3.7
Carbon Brushes
(FE 35, FE 40)
Top:
1 = Tab
2 = Spring
Correctly positioned
activating cord
- On FE 35, hook activating cord onto
adjusting lever and position it behind the
pin.
- Place the upper housing molding in
position. Screw on the clamp nut. Insert
mounting screws and tighten down to 1.2
Nm (0.9 Ibf.ft).
Opening cover
Bottom:
1 = Carbon brush
2 = Retaining tag
The commutator is subject to normal wear.
The friction generated by the carbon
brushes causes the commutator surface to
wear gradually and eventually leaves deep
scores. The scores cause an increase in
sparking between the carbon brushes and
commutator. Therefore, before installing
new carbon brushes, inspect the
commutator for wear and replace the
complete motor if necessary.
- Remove the motor - see 3.6.
- Use a small screwdriver to remove the
cover.
- Bend open the tab on the brush holder
and remove the spring.
Note: Carbon brushes must always be
replaced in pairs.
- Push the retaining rings in the brush
holder slightly toward the mowing head
so that the worn carbon brush can slip
out of the brush holder.
- Fit new carbon brush, push the spring
into the brush holder and bend the tab
back to the horizontal position.
- Close the cover.
- Install the motor - see 3.6.
FE 35, 40, 55, EC 70
14
3.8 Switch Unit of Automatic
Feed Mechanism
(FE 40)
Top:
Solenoid mounting plate
Bottom:
Removing switch unit
Top:
Right angle connectors on switch unit
Bottom:
Switch unit assembly
(original version)
1 = Thermistor
Switch unit assembly
(new version)
1 = Solenoid
2 = Solenoid mounting plate
3 = Switch unit
4 = Iron core
5 = Actuating pin
The complete switch unit has to be
replaced if any one of its components is
faulty. The new and original parts cannot be
combined. The new switch unit assembly
can be identified as follows:
The connecting wires between the switch
unit and solenoid are yellow instead of
red. No thermi- is fitted.
- Fit the iron core, cross hole facing
outward, in the solenoid.
Important: All wires must be reconnected
to their original terminals - see 3.1.
- Remove the motor - see 3.6.
- Take the solenoid mounting plate out
of its seat in the housing.
- Remove the switch unit from the
housing molding.
- Pull the right angle connectors off the
switch unit.
Installation is a reversal of the removal
sequence.
Note: A modified switch unit is installed to
avoid the need to solder the switch unit's
sensitive printed circuit board.
FE 35, 40, 55, EC 70
3.9
Adjusting Automatic
Feed Mechanism (FE 40)
Potentiometer
15
3.10
Motor
(FE 55, EC 70)
Top:
Switch
Top:
Lifting motor out of housing
Bottom:
Wires from motor
Bottom:
Correct position of wiring
If the automatic feed mechanism
malfunctions, its tripping point can be
corrected on the potentiometer.
- Remove upper housing molding –
see 3.6.
- Use a small screwdriver to rotate the
potentiometer on the switch unit.
Note: Turn clockwise = feed is activated
when cutting line is shorter (later).
Turn counterclockwise = feed is
activated when cutting line is longer
(earlier).
- Refit upper housing molding.
- Pull the drive tube off the adapter –
see 4.3.
- Remove the motor from the lefthand
housing molding.
- Remove the on/off switch from its seat
in the left-hand housing molding.
Installation is a reversal of the removal
sequence.
- Pull the wires from the motor off the
switch terminals.
Note: Reconnect both wires to the
original terminals - see 3.1.
Position the wires in the slot in the
housing molding.
FE 35, 40, 55, EC 70
3.11
Fanwheel
16
3.12
Adapter
3.13
Strain Relief Flap
Top:
Removing the fanwheel
Top:
Prying adapter off shaft
Top:
Removing strain relief flap
Bottom: Press-fitted fanwheel a
= 3.5 mm (0.14 in)
Bottom:
Installing the adapters
Bottom:
Torsion spring
- Remove the motor - see 3.10.
- Remove the motor - see 3.10.
- Rest fanwheel on bench and use a piece
of round stock (6 mm/ 1/4" dia.) to press
it off the shaft.
- Use a hot air blower (e.g. hair dryer) to
heat the adapter and then pry it off the
shaft with two screwdrivers.
- Take the strain relief flap out of the
left-hand half of the housing.
- Press the fanwheel, blades first, onto the
shaft until distance "a" is obtained.
- Press adapter on to shaft as far as
stop.
- Remove the torsion spring from the
flap.
- Install the motor - see 3.10.
- Install the motor - see 3.10.
- When refitting the flap, make sure
that torsion spring is properly seated.
- Separate the two halves of the
housing - see 3.4.
FE 35, 40, 55, EC 70
4.
SHAFT
4.1
Line Feed Lever/
17
4.2
Top:
Removing the connecting tube
1 = Cable
Top:
Activating cord on adjusting lever
Bottom:
Activating cord on line feed lever
Connecting Tube /
Loop Handle
Correctly positioned
activating cord
Bottom:
Cylindrical pin
- Tie a piece of string (about 1000 mm/39
in long) to the activating cord.
- Pull the activating cord out of the
connecting tube so that the string is still
inside the tube and can be used to fit
the new activating cord.
Installation is a reversal of the removal
sequence.
Note: After fitting the new activating cord,
pass it behind the pin the connecting tube
and around the pin in the housing
molding.
- Remove upper housing molding –
see 3.6.
- Remove the activating cord - see 4.1.
- Remove the on/off switch - see 3.3.
- Unhook activating cord from
adjusting lever.
- Remove the connecting tube and pull
out the cable at the same time.
- Remove the handle - see 3.2.
- Unhook the activating cord from
the line feed lever.
- Pull the cylindrical pin out of the
connecting tube.
FE 35, 40, 55, EC 70
18
4.3
Drive Tube
(FE 55, EC 70)
Top:
Removing clamp nut
Top:
Installing connecting tube (FE 35)
1 = Hole at end of slot
Bottom:
1 = Clamp nut
2 = Loop handle
Bottom:
Installing connecting tube (FE 40)
1 = Slot
Bottom:
Removing the drive tube
- Slip the clamp nut off the connecting
tube.
- On FE 35, fit connecting tube so that
the cylindrical pin engages the hole
at the end of the slot.
- Take out the housing mounting
screws and remove the righthand
housing molding.
- On FE 40, fit connecting tube so that
the cylindrical pin engages the slot.
- Raise the drive tube until the
retaining block is clear of the
recess in the left-hand housing
molding.
- Release clamp nut on loop handle
and pull the loop handle off the
connecting tube.
Installation is a reversal of the
removal sequence.
Top: Housing
mounting screws
- Pull the drive tube off the adapter.
Note: Pay special attention to the
following points:
FE 35, 40, 55, EC 70
19
4.4
1 = Retaining block
2 = Peg
3 = Recess in housing molding
- To replace the drive tube, remove
the bearing housing on the FE 55
or the gearhead on the EC 70 –
see 5.1 or 5.2.
Pull out the drive shaft, see 4.4, and
remove the loop handle, see 4.5.
Reassemble in the reverse sequence.
Note: Push the drive tube onto the
adapter. Fit peg of retaining block into
hole in drive tube and engage retaining
block in recess in housing molding.
Torque down housing mounting screws
to 5.5 Nm (4.0 Ibf.ft).
Drive Shaft
(FE 55, EC 70)
Withdrawing flexible shaft
(FE 55, EC 70)
Drive shaft must project
a = 15 mm (0.6 in) on FE 55
20 mm (0.8 in) on EC 70
The drive shaft is supported inside the drive
tube in bearing bushes. It is not possible to
replace the bearing bushes, i.e. a new drive
tube has to be installed in the event of a
fault or damage.
- Pull the drive shaft out of the drive tube.
- On FE 55, remove the bearing housing,
see 5.1. On EC 70, remove the gearhead,
see 5.2.
Important: Apply the grease uniformly and
thinly to the whole drive shaft. Do not pump
grease directly into the drive tube.
- Coat the drive shaft with STIHL
multipurpose grease, see 6.2, before
installation.
- Push the drive shaft into the drive tube.
Note: Push the drive shaft into the drive
tube until dimension "a" is obtained (see
illustration). If necessary, apply slight
pressure to the shaft and rotate it slowly
until it can be pushed in to the specified
dimension.
- Fit the bearing housing or gearhead.
FE 35, 40, 55, EC 70
4.5
20
Loop Handle
(FE 55, EC 70)
Top:
Clamp screw on loop handle
Bottom:
Removing the fixing
Top:
Pulling off handle hose
Bottom:
1 = Loop handle
2 = Clamping block
1 = Clamp screw
2 = Square nut
- Place the square nut in position and
insert the clamp screw from the
other side. Line up the loop handle
and tighten down clamp screw
firmly.
- Take the clamp screw out of the
loop handle. Remove the loop
handle and clamping block from the
drive tube.
- To replace the handle hose,
unscrew the fixing screw from the
loop handle.
- Turn the loop handle to one side
and pull off the handle hose.
- Refit the loop handle on the drive
tube. Place the clamping block
against the drive tube and slide it
sideways into the loop handle (see
illustration).
FE 35, 40, 55, EC 70
5.
CUTTING TOOL DRIVE
5.1
Bearing Housing (FE 55)
Top:
1 = Clamp
2 = Deflector shield
Bottom:
1 = Bearing housing
2 = Clamp
- Remove the mowing head (if
fitted).
- Release screw on clamp and pull
deflector shield off the bearing
housing.
- Release screw on bearing
housing clamp and slip the clamp
off the bearing housing.
21
Top:
Fixing screw
Top:
Removing the circlip
Bottom:
Pliers 0811 611 8200
Bottom:
Removing the washer
- Take the fixing screw out of the
bearing housing and pull bearing
housing off the drive tube.
- Remove the circlip from the
output shaft.
- Remove the washer from the
output shaft.
FE 35, 40, 55, EC 70
22
Top:
Removing the output shaft
Top:
Pressing home plain bearing
Bottom:
Press arbor 4119 893 7200
Bottom: Pressing home plain
bearing
- Pull the output shaft out of the
bearing housing.
- Use press arbor to install the two
plain bearings until they butt against
shoulder on bearing housing.
- Carefully drive the two plain
bearings out of the bearing
housing.
Assembly is a reversal of the
disassembly sequence.
Note: Pay special attention to the
following points:
Top:
Lining up holes in bearing housing and drive
tube
Bottom:
Correct position of deflector shield in relation to
bearing housing
- Push bearing housing onto drive
tube so that the holes line up.
- Insert the fixing screw and tighten
down to 3 Nm (2.2 Ibf.ft) .
- Line up recess in neck of deflector
shield with peg on bearing housing.
Push deflector onto bearing
housing as far as stop.
- Torque down bearing housing
clamp screw to 6.5 Nm (4.8 Ibf.ft).
FE 35, 40, 55, EC 70
5.2
Gearhead (EC 70)
5.2.1
Disassembly
Top:
Unscrewing flanged nut
Bottom:
1 = Thrust plate
2 = Cutting blade
- Use 5 mm (0.2 in) drift to block the
output shaft and unscrew the flanged
nut.
Note: Flanged nut has left-hand
thread.
- Take the thrust plate and cutting
blade off the output shaft.
23
Top:
Removing thrust plate
Top:
Removing deflector shield
Bottom:
1 = Clamp
2 = Clamp screw
3 = Star knob screw
Bottom:
1 = Washer
2 = Retainer
3 = Mounting screws
4 = Star knob screw
- Take the thrust plate off the output
shaft.
- Remove the deflector shield from the
gearhead.
- Unscrew the clamp screw and star
knob screw from the clamp and then
remove the clamp.
Note: The following three operations
must be performed to replace the
deflector shield:
- Take the mounting screws out of
the retainer, pull the star knob
screw out of the bore and remove
the washer.
FE 35, 40, 55, EC 70
Top:
Removing bearing bolt
from depth wheel
Bottom:
1 = Rubber flap
2 = Fastening screw
- Unscrew the bearing bolt from the
depth wheel and remove the wheel.
- Take out the fastening screw
and remove the rubber flap.
24
Top:
Clamp screw
Bottom:
Pliers 0811 641 8380
- Release clamp screw on gearhead
and pull the gearhead off the drive
tube.
- Remove the circlip from groove in
input end of the gearhead.
Top:
Removing circlip from input end of
gearhead
Bottom:
Removing circlip from output
end of gearhead
- Remove the circlip from groove in
output end of the gearhead.
- Heat the gearhead housing to about
110 to 140°C (230 -280°F). Remove
the gearhead components from the
input end first and then the output
end by knocking the gearhead
against a wooden base.
FE 35, 40, 55, EC 70
25
Top:
Removing output shaft
Top:
Pliers 0811 611 8200
Bottom:
1 = Bevel gear
2 = Ball bearing
Bottom:
Removing the circlip from the
drive pinion
- Press the output shaft out of the ball
bearing.
- Pull the ball bearing and bevel
gear off the output shaft.
- Remove the circlip from the
drive pinion.
Top:
Pressing drive pinion out of
ball bearings
Bottom:
Pinion set
- Press the drive pinion out of the ball
bearings.
- Clean all parts and inspect them for
signs of wear or damage.
Note: The drive pinion and bevel gear
are only available as matched pairs,
i.e. as a pinion set.
FE 35, 40, 55, EC 70
26
5.2.2 Assembly
Top:
1 = Drive pinion
2 = Open ball bearing
3 = Sealed ball bearing
Bottom:
Ball bearing on output shaft
- Heat the ball bearings for input end
to about 50°C (120°F) and push
them onto the drive pinion so that
the open bearing locates against
the pinion.
- Fit the circlip in the groove.
- Heat ball bearing for output end to
about 50°C (120°F and push it onto
the output shaft as far as stop.
Top:
Pushing bevel gear onto the
output shaft
Bottom:
Fitting the sealed ball bearing in
gearhead housing
Top:
Fitting the output shaft
Bottom:
Fitting the drive pinion
- Push the bevel gear (teeth
first) onto the output shaft.
- Place the preassembled output
shaft in position and press it home
as far as stop.
- To install the bearing and pinion
set, heat the gearhead housing to
about 140°C (285°F), e.g. on a
heating plate or with a hot air
blower.
- Place the preassembled drive
pinion in position and press it
home as far as stop.
- Push the sealed ball bearing into the
housing as far as stop.
Note: Make sure the teeth of the drive
pinion and bevel gear mesh properly
during installation.
FE 35, 40, 55, EC 70
27
Top:
Fitting gearhead on drive tube
Screw plug for gear
lubricant
-
-
Bottom:
Washers
Fit the circlips in their respective
grooves at the input and output ends of
the gearhead housing.
- Refit the rubber flap.
- To fit the depth wheel, slip washer
over the bearing bolt. Push the
bearing bolt through the depth wheel,
fit a washer at the other side and
screw the bearing bolt into the
deflector shield.
Remove the screw plug from the
gearhead, screw the tube of grease into
position and fill the gearhead with
grease.
Note: Use STIHL gear lubricant, see 6.2,
for lubrication of the bevel gear drive.
- Position the deflector shield against
the gearhead. Fit a washer on the
clamp screw and place the clamp in
position.
Important: Fill the gearhead with approx.
20 g (3/4 oz) grease.
- Fit a new self-locking nut and tighten
it down firmly.
Service note:
Top up gearhead with grease
(max. 5...10 g / 1/4 - 3/8 oz) only if no
grease is visible on the inside of the
screw plug.
-
Unscrew the tube of grease, refit the
screw plug and tighten it down firmly.
Fitting the clamp
1 = Deflector shield
2 = Washer
- Slide the gearhead onto the drive tube
-turn the output shaft back and forth at
the same time so that the square end
of the drive shaft engages the square
socket in the drive pinion.
- Push the gearhead as far as stop and
line it up. Tighten down the two clamp
screws to 7.5 Nm (5.5 Ibf.ft).
- Refit the cutting blade by reversing
the removal sequence.
FE 35, 40, 55, EC 70
5.3
28
Mowing Head / Motor
Mounting Plate
(FE 35, FE 40)
Top:
Prying off the driver
Removing cap
Bottom:
Removing mowing head housing
Top:
Prying out support roller
Bottom:
Mounting screws of
motor mounting plate
The mowing head housing and driver
should be installed with the motor
removed. This avoids excessive bearing
loads when pressing on the driver.
- Remove the motor - see 3.6.
- Clamp the motor, with the
mowing head facing up, in a
vise.
Important: Use protective jaws. Take
care not to damage winding.
- Hold the mowing head housing
steady.
- Press the cap downward, turn it
counterclockwise as far as stop and
lift it away.
- Heat the driver (e.g. with hot air
blower or hair dryer) and use two
screwdrivers to lever it off (see
illustration).
-Take the spool out of the mowing head
housing.
- Remove the mowing head housing.
- To replace the motor mounting plate,
perform the following operations:
- Carefully pry the support roller
(above the mounting screw) out of
its seat.
- Take the mounting screws out of the
motor mounting plate and remove the
mounting plate.
FE 35, 40, 55, EC 70
29
Top:
Mowing head housing with
retrofitted sleeves
Adapter sleeve
Bottom:
Mowing head housing with
aluminum sleeves
Top:
1 = Slot in mowing head housing
2 = Adapter sleeve
Bottom:
Pressing on the driver
- If necessary, use a 2.5 mm (0.10 in)
punch to drive the adapter sleeve
out of the rotor shaft.
Assembly is a reversal of the
disassembly sequence.
Note: Pay special attention to the
following points:
- Torque down mounting screws of motor
mounting plate to 1.8 Nm (1 .3 Ibf.ft).
- Carefully press the support roller
(shorter bearing pin must face rotor
shaft) into its seat.
Note: Mowing head housings with
aluminum sleeves (for nylon line)
are installed from machine numbers
X 19 966 870 (FE 35) and X 19 971 252
(FE 40).
If the trimmer still has a mowing head
housing with retrofitted sleeves, it is
advisable to install a mowing head housing
with aluminum sleeves for improved nylon
line control and better heat dissipation.
- Fit the mowing head housing so that
the adapter sleeve engages the slot.
- Press the driver onto the rotor
shaft as far as it will go.
- Fit the spool, projecting edge facing
up, so that the nylon lines locate in
the sleeves.
- Hold the mowing head housing
steady.
- Fit the cap in position, press it
downward and turn it clockwise as
far as stop.
- Install the motor - see 3.6.
FE 35, 40, 55, EC 70
30
6.
Special Servicing Tools and Aids
6.1
Special Servicing Tools
No.
Part Name
Part No.
1
Crimping tool
5910 890 8210
Attaching connectors to electric wires
2
Pliers A 10
0811 611 8200
External circlip on bearing housing and
drive pinion
3
Press arbor
4119 893 7200
Installing plain bearings in
bearing housing
4
Pliers A 19
0811 641 8380
Internal circlip on gearhead
Application
FE 35, 40, 55, EC 70
6.2
No.
31
Servicing Aids
Part Name
Part No.
Application
1
Electrician's repair kit
0000 007 1013
2
STIHL multipurpose grease
0781 120 1109
Lubricating drive shaft
(FE 55, EC 70)
3
STIHL gear lubricant
0781 120 1117
Lubricating gearhead (EC 70)