Service and Repairs
General Precautions for Removing and Installing Hydraulic System Components
Before Repair or Replacement of Components
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.
After Repair or Replacement of Components
1.
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.
Thoroughly clean machine before disconnecting, re-
2. If component failure is severe or hydraulic system is
contaminated, flush hydraulic system (see Flush Hy-
draulic System in this section).
moving or disassembling any hydraulic components.
Make sure hydraulic components, hose connections
andfittingsarethoroughlycleaned.Alwayskeepinmind
the need for cleanliness when working on hydraulic
components.
3.
Lubricate O--rings and seals with clean hydraulic oil
before installing hydraulic components.
4.
draulic tubes, hydraulic fittings and components before
reconnecting.
Make sure all caps or plugs are removed from hy-
CAUTION
5.
draulic hoses and fittings (see Hydraulic Fitting Installa-
tion in the General Information section of this chapter).
Use proper tightening methods when installing hy-
Before loosening any hydraulic component, op-
erate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulicoil.SeeRelievingHydraulic SystemPres-
sure in the General Information section of this
chapter.
6.
proper adjustment, binding or broken parts.
After repairs, check control linkages and cables for
7.
After repairs are completed, clean hydraulic compo-
3.
Operateallhydraulic controlstorelieve systempres-
nents, hose connections and fittings to prevent future
accumulation of dirt and debris on hydraulic compo-
nents.
sure before loosening any hydraulic connection (see
Relieving Hydraulic System Pressure in the General In-
formation section).
8.
After disconnecting or replacing any hydraulic com-
4.
tings or components left open or exposed to prevent
contamination.
Putcapsorplugsonanyhydrauliclines,hydraulicfit-
ponents, operate machine functions slowly until air is
outofsystem(seeHydraulicSystemStartUpinthissec-
tion).
5.
place labels to ensure proper installation after repairs
are completed.
Before disconnecting hydraulic lines and hoses,
9.
ered, shut off engine and correct leaks.
Check for hydraulic oil leaks. If any leaks are discov-
10.Check
oil if necessary.
oil level in hydraulic reservoir and add correct
6.
Note the position of hydraulic fittings (especially el-
bow fittings) on hydraulic components before removal.
Mark parts if necessary to make sure that fittings will be
aligned properly when reinstalling hydraulic hoses and
tubes.
Hydraulic System
Page 4 -- 60
Groundsmaster 4300--D
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