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Groundsmaster 4000--D Hydraulic SystemPage 4 -- 61
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, apply parking
brake, lower cutting decks or attachments and stop en-
gine. Remove key from the ignition switch.
2. Clean machine before disconnecting, removing or
disassembling any hydraulic components. Make sure
hydraulic components, hoses connections and fittings
are cleaned thoroughly. Always keep in mind the need
for cleanliness w hen working on hydraulic equipment.
CAUTION
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil.
3. Putcaps or plugs on any hydraulic lines,hydraulicfit-
tings and components left open or exposed to prevent
contamination.
4. Put labels on disconnected hydraulic lines and
hoses forproperinstallation after repairs arecompleted.
5. Note the position of hydraulic fittings (especially el-
bow fittings) on hydraulic components before removal.
Mark partsifnecessary to make sure they willbealigned
properly when installing hydraulic hoses and tubes.
After Repair or Replacement of Components
1. Checkoillevelin the hydraulic reservoir and add cor-
rect oil if necessary. Drain and refill hydraulic system
reservoir and change oil filter if component failure was
severe or system is contaminated (see Flush Hydraulic
System in this section).
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 in the General Information section of this chapter).
5. After repairs, check control linkages or cables for
proper adjustment, binding or broken parts.
6. 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).
7. Checkfor hydraulicoilleaks. Shutoffengine andcor-
rectleaksif necessary.Checkoillevel inhydraulicreser-
voir and add correct oil if necessary.
Check Hydraulic Lines and Hoses
WARNING
Keep body and hands away from pin hole leaks
or nozzles that eject hydraulic fluid under high
pressure. Use paper or cardboard, not hands, to
search for leaks. Hydraulic fluid escaping under
pressure can have sufficient force to penetrate
the skin and cause serious injury. If fluid is in-
jected into the skin, it must be surgically re-
moved within a few hours by a doctor familiar
withthistypeof injury.Gangrenemay resultfrom
such an injury.
IMPORTANT: Check hydraulic lines and hoses daily
for leaks, kinked lines, loose mounting supports,
wear, loose fittings or any hose deterioration. Make
all necessary repairs before operating.
Hydraulic
System