Groundsmaster 4300--D Hydraulic SystemPage 4 -- 77
CAUTION
Beforeopeninghydraulicsystem,operateallhy-
draulic controls to relieve system pressure and
avoid injury from pressurized hydraulic oil. See
RelievingHydraulicSystemPressurein theGen-
eral Information section of this chapter.
Removal (Fig. 74)
1. Parkthemachineonalevelsurface,engageparking
brake, lower cutting decks and stop engine. Remove
key from the ignition switch.
2. Chock rearwheelstopreventmachine 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 R emoving and
Installing Hydraulic System Components at the begin-
ning of the Service and Repairs section of this chapter.
WARNING
Beforejackingupthemachine,reviewandfollow
Jacking Instructions in Chapter 1 -- Safety.
5. Jack up machineenough to allowthe removalof the
front wheel. Support machine with jack stands.
6. Removefrontwheelfrommachine(seeFrontWheel
Removal in the Serviceand 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: DONOThitwheel hub,pullerorwheel
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
wheelmotortopreventhydraulicsystemcontamination.
13.Label hydraulic connections at wheel motor for as-
sembly purposes.
14.Disconnecthydrauliclinesfromfittingsonwheelmo-
tor. Allow lines to drain into a suitable c ontainer.
15.Put caps or plugs on disconnected lines and fittings
to prevent contamination.
16.Support wheel motor to prevent it from falling. Re-
movefour(4)locknutsfromcapscrewsthatsecuremo-
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.Ifhydraulicfittingsaretoberemovedfromwheelmo-
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 ayellow identificationmark on themotor
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
andplacenewO--ringstofittings.Install fittingsintomo-
torports using marksmade duringthe removalprocess
toproperlyorientatefittings(seeHydraulicFittingInstal-
lationintheGeneralInformationsectionofthischapter).
2. Positionwheelmotortoframe.Slidebrakeassembly
withbrake bracket(item 14), brakespring bracket(item
30)andfour(4)capscrewsontowheelmotorandframe.
3. Install and tightenfour (4) locknuts ontocapscrews
tosecuremotorandbrakecomponentstoframe.Torque
cap screws from 80 to 100 ft--lb (109 to 135 N--m).
4. Thoroughly clean motor shaft and wheel hub taper.
5. Installsquare keyintothewheelmotor shaftkeyslot.
Alignwheelhubwithkeyandslidewheelhubontomotor
shaft.
IMPORTANT: Do not reuse lock nut that secures
wheelhubtowheelmotorafterithasbeenremoved.
Hydraulic
System
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