Groundsmaster 4300--DHydraulic System Page 4 -- 60
Service and Repairs
General Precautions for Removing and Installing Hydraulic System Components
Before Repair or Replacement of Components
1. Before removing any parts from the hydraulic sys-
tem, park machine on a level surface, engage parking
brake, lower cutting decks and stop engine. Remove
key from the ignition switch.
2. Thoroughlycleanmachinebeforedisconnecting,re-
moving or disassembling any hydraulic components.
Make sure hydraulic components, hose connections
andfittingsarethoroughlyc leaned.Alwayskeepinmind
the need for cleanliness when working on hydraulic
components.
CAUTION
Before loosening any hydraulic component, op-
erate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulicoil.SeeRelievingHydraulicSystemPres-
sure in the General Information section of this
chapter.
3. Operateallhydrauliccontrolstorelievesystempres-
sure before loosening any hydraulic connection (see
RelievingHydraulic SystemPressure intheGeneralIn-
formation section).
4. Putcapsorplugsonanyhydrauliclines,hydraulicfit-
tings or components left open or exposed to prevent
contamination.
5. Before disconnecting hydraulic lines and hoses,
place labels to ensure proper installation after r epairs
are completed.
6. Note the position of hydraulic fittings (especially el-
bow fittings) on hydraulic components before removal.
Mark partsif necessary tomake sure thatfittings willbe
aligned properly when reinstalling hydraulic hoses and
tubes.
After Repair or Replacement of Components
1. If a component failure occurred in the closed loop
traction circuit (e.g. piston pump or wheel motor), filter-
ing the traction circuit is recommended (see Filtering
Closed--Loop Traction Circuit in this section).
2. If component failure issevere or hydraulic systemis
contaminated, flush hydraulic system (see Flush Hy-
draulic System in this section).
3. Lubricate O--rings and seals with clean hydraulic oil
before installing hydraulic components.
4. Make sure all caps or plugs are removed from hy-
draulic tubes, hydraulic fittings and components before
reconnecting.
5. Use proper tightening methods when installing hy-
draulichoses andfittings (seeHydraulic FittingInstalla-
tion in the General Information section of this chapter).
6. After repairs, check control linkages and cables for
proper adjustment, binding or broken parts.
7. After repairsare completed, cleanhydraulic compo-
nents, hose connections and fittings to prevent future
accumulation of dirt and debris on hydraulic compo-
nents.
8. After disconnecting or replacing any hydraulic com-
ponents, operate machine functions slowly until air is
outofsystem(seeHydraulicSystemStartUpinthissec-
tion).
9. Checkforhydraulic oilleaks.Ifanyleaksare discov-
ered, shut off engine and correct leaks.
10.Checkoillevel inhydraulicreservoirandaddcorrect
oil if necessary.
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