Service Manual

Groundsmaster 4300--D Hydraulic SystemPage 4 -- 77
CAUTION
Before opening hydraulic system, operate all 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.
Removal (Fig. 74)
1. Parkthe machine ona levelsurface, engage parking
brake, lower cutting decks and stop engine. Remove
key from the ignition switch.
2. Chock rear wheels to prevent machine fromshifting.
3. Loosen, but do not remove, five (5) wheel lug nuts
and lock nut (item 17) that secures wheel hub to wheel
motor.
4. Read the General Precautions for Removing and
Installing Hydraulic System Components at the begin-
ning of the Service and Repairs section of this chapter.
WARNING
Beforejackingupthe machine,review and follow
Jacking Instructions in Chapter 1 -- Safety.
5. Jack up machine enough to allow the removal of the
front wheel. Support machine with jack stands.
6. Removefront wheel from machine (see Front Wheel
Removal in the Service and Repairs section of Chapter
6 -- Chassis).
7. Remove return spring and clevis pin that secure
brake cable clevis to brake actuator lever. Position
brake cable clevis away from actuator lever.
8. Remove brake drum.
9. Make sure wheel hub lock nut (item 17) is loosened
at least two (2) turns.
IMPORTANT: DO NOT hit wheel hub, puller or wheel
motor with a hammer during wheel hub removal or
installation. Hammering may cause damage to the
wheel motor.
10.Use hub puller (see Special Tools in this chapter) to
loosen wheel hub from wheel motor.
11.Remove lock nut and wheel hub from motor shaft.
Discard lock nut. Locate and retrieve square key.
12.Thoroughly clean hydraulic line ends and fittings on
wheelmotortopreventhydraulic systemcontamination.
13.Label hydraulic connections at wheel motor for as-
sembly purposes.
14.Disconnect hydraulic linesfrom fittings onwheelmo-
tor. Allow lines to drain into a suitable container.
15.Put caps or plugs on disconnected lines and fittings
to prevent contamination.
16.Support wheel motor to prevent it from falling. Re-
move four (4) lock nuts fromcap screwsthat secure mo-
tor and brake bracket to frame.
17.Remove four (4) cap screws, brake assembly with
brake bracket (item 14) and brake spring bracket (item
30) from wheel motor and frame.
18.Remove wheel motor from machine.
19.If hydraulic fittingsaretoberemovedfrom wheel mo-
tor, mark fitting orientation to allow correct assembly.
Remove fittings from motor and discard O--rings.
Installation (Fig. 74)
IMPORTANT: Because of internal differences in
front wheel motors, DO NOT interchange front
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
housing. If necessary, use parts catalog and part
number on wheel motor to identify RH and LH mo-
tors.
1. If fittings were removed from wheel motor, lubricate
and place new O--rings to fittings. Install fittings intomo-
tor ports using marks made during the removal process
toproperly orientate fittings(seeHydraulic FittingInstal-
lationin the GeneralInformation section ofthischapter).
2. Positionwheelmotor to frame.Slidebrakeassembly
with brake bracket (item 14), brake spring bracket (item
30)andfour (4) cap screwsontowheelmotorandframe.
3. Install and tighten four (4) lock nuts onto c ap screws
tosecuremotor andbrakecomponentstoframe.Torque
cap screws from 80 to 100 ft--lb (109 to 135 N--m).
4. Thoroughly clean motor shaft and wheel hub taper.
5. Install square key into the wheel motor shaft keyslot.
Alignwheelhubwithkey and slide wheel hub ontomotor
shaft.
IMPORTANT: Do not reuse lock nut that secures
wheelhub to wheelmotor after ithas been removed.
Hydraulic
System