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Groundsmaster 4500--D/4700--D Hydraulic SystemPage 4 -- 73
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. Clean machine before disconnecting, removing or
disassembling any hydraulic components. Make sure
hydraulic components, hose connections and fittings
are cleaned thoroughly. Always keep in mind the need
for cleanliness when working on hydraulic equipment.
WARNING
Before disconnecting or performing any work
on the hydraulic system, all pressure in the sys-
tem must be relieved. See Relieving Hydraulic
System Pressure in the General Information sec-
tion in this chapter.
3. Put caps or plugs on any hydraulic lines, hydraulic fit-
tings and components left open or exposed to prevent
system co ntamination.
4. Put labels on disconnected hydraulic lines and
hoses for proper installation after repairsare completed.
5. Note the position of hydraulic fittings (especially el-
bow fittings) on hydraulic components before removal.
Mark parts if necessary tomake sure they will be aligned
properly when installing hydraulic hoses and tubes.
After Repair or Replacement of Components
1. Check oil level in the hydraulic reservoir and add cor-
rect oil if necessary. Drain and refill hydraulic system
reservoir and change oil f ilters if component failure was
severe or system is contaminated (see Flush Hydraulic
System in this section).
IMPORTANT: Follow all local codes and regulations
when recycling or disposing hydraulic fluid and fil-
ters.
2. Lubricate O--rings and seals with clean hydraulic oil
before installing hydraulic components.
3. Make sure caps or plugs are removed from the hy-
draulic tubes, hydraulic fittings and components before
reconnecting.
4. Use proper tightening methods when installing hy-
draulic hoses and fittings (see Hydraulic Fitting Installa-
tion and Hydraulic Hose and Tube Installation in the
General I nformation section of this chapter).
5. After repairs, check control linkages and cables for
proper adjustment, binding or broken parts.
6. If piston (traction) pump, front wheel motors or rear
axle motor was removed from machine for service, fill
housing through case drain with new hydraulic oil before
starting engine. This will ensure that internal compon-
ents have adequate lubrication during initial operation.
7. After disconnecting or replacing any hydraulic com-
ponents, operate machine functions slowly until air is
out of system (see Charge Hydraulic System in this sec-
tion).
8. Before returning machine to regular operation,
check for hydraulic oil leaks. Shut off engine and correct
leaks if necessary. Check oil level in hydraulic reservoir
and a dd correct oil if necessary.
Hydraulic
System