UNIT 6
Tractor Hitches
PTO’s
Hydraulics
www.precisiongps.com
Tractors are
Powerful Machines
Get ‘er done!
Tractor Hook-Up Parts
Hydraulic Plugs
3-Point Hook-Up
PTO
Shaft
Drawbar
THE DRAWBAR
 Designed to pull
loads
 Adjust to the
correct height to
ensure safe towing
 Position so the PTO
shaft is straight
http://www.four-h.purdue.edu/tractor_safety/
2 TYPES
#1- Stationary
 Extends backward or
forward
 Two or three positions
possible with pin movement
 Must be adjusted to PTO
http://www.four-h.purdue.edu/tractor_safety/
2 TYPES
continued
#2- Swinging
 Swings in direction
tractor turns.
 Must be secured in
fixed position to travel
on the road or when
using PTO.
 Can be locked in
position to be used as a
fixed type.
http://www.four-h.purdue.edu/tractor_safety/
Drawbar Safety
 Must adjust for PTO use
 ONLY attach to drawbar,
2-point, or
3-point hitch if pulling
load (Never to any
other part).
 Raising height of bar
excessively can cause
overturn
http://www.four-h.purdue.edu/tractor_safety/
Proper Hitching Procedures:
 Back tractor slowly
into place.
 Place tractor into
neutral and engage
brake before
dismounting.
 Connect directly
behind tractor.
 Use lynch pin or hitch
pin for locking, along
w/ cotter pin or clip.
 Always hitch your own
tractor.
Hitch Pin
www.johnnyproducts.com
Lynch Pin
www.hollywoodracks.com
THREE POINT HITCH PARTS:
Top Link
Two Lower
Draft Links
http://www.four-h.purdue.edu/tractor_safety/
Benefits of 3-Point Hitch
 Easy adjustment of load with control
levers.
 Level implement laterally.
 Adjust implement pitch.
 Most hitches equipped with sway blocks
to restrict side-to-side motion.
Hitching Safety
 NEVER work under a raised implement.
 NEVER depend on a hydraulic valve for your
safety.
 Place supports under implement.
 Stop and shut down tractor before
performing maintenance.
 Be aware of location of others.
How many different categories of ThreePoint hitches are there?
 Difference between categories is by size.
Category
I
II
III
IV
Max. Drawbar Power
20-45 hp
40-100 hp
80-225 hp
180-400 hp
(This is on the test…)
Quick Attachment Couplers
 Used for fast connection and release
of implements.
 Make sure you hook hitch pins
uniformly.
 Check coupler for proper locking,
cracks and wear.
Power Take-Off (PTO)
www.acs.aone.net
3 Types:
 Continuous Running
- operates when master clutch is engaged
 Independent
- transmission and PTO powered through
separate clutches
-PTO will still run when tractor is stopped or
in motion
 Transmission Driven
- PTO runs only when tractor is in motion
PTO & Drawbar Height
Requirements
Type
PTO Speed
Shaft Size
#Teeth
on PTO
Height
Continuous
540 r.p.m.
1 3/8”
6
14”*
Independent
1000 r.p.m.
1 3/8”
21
16”*
Transmission
1000 r.p.m.
1 ¾”
20
20”*
*+/- 2”
PTO Safety
 Many accidents occur
because of PTO
 NEVER attempt to
remove anything from
PTO while it is in motion.
 A tractor engine should
always be shut off before
leaving the operators
seat to perform any
adjustment, lubrication,
or cleanout of implement
www.osh.dol.govt
PTO Shields
 Developed to make
tractor PTO
operation safer.
 Shields should
always be kept in
place when machine
is running.
PTO Shield Types
 Master
– prevent contact with
PTO stub shaft
 Stub shaft guard
– enclose stub shaft
when not being used
 Tunnel Shield
– attaches to master
shield
PTO Shields Types (cont.)
 Integral-journal
Shield
– completely encloses
PTO shaft and rotates
with shaft
 Fully shielded
power shaft (1972)
- completely covers
universal joints and PTO
shaft coupler
What should you do if When working on someone’s farm and the
boss tells you to use a piece of machinery,
but the PTO shaft guard is missing. What
should you do?



A- Perform the task without saying anything
B- Wrap the shaft in duct tape, because duct
tape fixes everything!
C- Talk to your adult supervisor about the
missing shield and tell them the shield needs to
be put on before doing the assigned task.
HYDRAULICS
 Provides power for steering, brakes,
lifting, and powering equipment
 Uses tractor engine to operate
hydraulic systems
Hydraulics Safety
 Check for leaks using
a card as shown.
 NEVER USE HAND
OR FINGERS!
 Escaping hydraulic
under extreme
pressure
 Can penetrate the
skin causing serious
injury.
REMOTE HYDRAULIC
CYLINDERS
 Single Acting
- One pressure line
 Double Acting
-Two pressure lines
- Driven by the tractors hydraulic
pump
 Flow adjustment possible
Hand Signals
Why do we use them?
Accidents frequently occur due to……
 Equipment being loud
 Can not hear each other
 Universal communication
Slow it down –
decrease speed
Raise
equipment
This far to go
Move out – Take off
Follow Me
http://www.four-h.purdue.edu/tractor_safety/
Stop
Stop the
Engine
Start the
Engine
Speed Up
Come to Me
Lower
Equipment
http://www.four-h.purdue.edu/tractor_safety/
CONCLUSION