Groundsmaster 4300--D Hydraulic SystemPage 4 -- 81
Removal (Fig. 75)
CAUTION
Before opening hydraulic system, operateall hy-
draulic controls to relieve system pressure and
avoid injury from pressurized hydraulic oil. See
Relieving Hydraulic System Pressure in the Gen-
eral Information section of this chapter.
1. Park the machine ona level surface,engage parking
brake, lower cutting decks and stop engine. Remove
key from the ignition switch.
2. Read the General Precautions for Removing and
Installing Hydraulic System Components at the begin-
ning of the Service and Repairs section of this chapter.
3. Chock front wheels to preventmachine froms hifting.
4. Loosen, but do not remove, five (5) wheel lug nuts
and lock nut (item 14) that secures wheel hub to wheel
motor.
WARNING
Before jacking up the machine,review and follow
Jacking Instructions in Chapter 1 -- Safety.
5. Jack up machine enough to allow the removal of the
rear wheel. Support machine with jack stands.
6. Removerear wheel assembly fromthe machine (see
RearWheelRemovalin the ServiceandRepairssection
of Chapter 6 -- Chassis).
IMPORTANT: DO NOT hit wheel hub, wheel hub
puller or wheel motor with a hammer during wheel
motor removal or installation. Hammering may
cause damage to the wheel motor.
7. Make sure that lock nut (item 14) that secures wheel
hub to wheel motor is loosened at least two (2) turns.
Usehubpuller (see Special Toolsinthis chapter) toloos-
en wheel hub from wheel motor.
8. Remove loosened lock nut and wheel hub from mo-
tor shaft. Discard lock nut. Locate and retrieve woodruff
key from wheel motor shaft.
9. Thoroughlycleanhydraulic hose ends and fittings on
rear wheel motor to prevent hydraulic system contami-
nation.
10.Label all hydraulic hoses for assembly purposes.
Remove hydraulic hoses from fittings on wheel motor.
Allow hoses to drain into a suitable container.
11.Put clean plugs in disconnected hydraulic hoses and
fittings to prevent system contamination.
12.Support the wheel motor to prevent it from falling dur-
ing removal.
13.Remove four (4) cap screws and lock washers that
secure wheel motor to the steering spindle.
14.Remove wheel motor from frame.
15.If necessary, remove hydraulic fittings from wheel
motor. Remove and discard O--rings from fittings.
Installation (Fig. 75)
IMPORTANT: Because of internal differences in
rear wheel motors, DO NOT interchange rear wheel
motors on machine (i.e. do not put right side motor
on left side of machine). The left side wheel motor
has a yellow identification mark on the motor hous-
ing. If necessary, use parts catalog and part number
on wheel motor to identify RH and LH motors.
1. If fittings were removed from wheel motor, lubricate
and install new O--rings to hydraulic fittings. Install fit-
tings into wheel motor ports (seeHydraulic FittingInstal-
lation in theGeneral Information section ofthis chapter).
2. Position rear wheel motor to steering spindle. Make
sure that ports in wheel motor are facing toward the rear
of the machine.
3. Secure wheel motor to spindle with four (4) cap
screws and lock washers.
4. Remove caps or plugs from disconnected hydraulic
hoses and wheel motor fittings that were placed during
wheel motor removal to prevent contamination.
5. Using labels placed during the removal process,
properly connect hydraulic hoses to wheel motor fittings
(see Hydraulic Hose and Tube Installation in the Gener-
al Information section of this chapter).
6. Make sure that tapers of wheel motor s haft and
wheel hub are thoroughly clean.
7. Positionwoodruff key to keyslot in wheel motor shaft.
IMPORTANT: Do not reuse lock nut that secures
wheel hub towheel motorafter it has beenremoved.
Hydraulic
System
