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Groundsmaster 4500--D/4700--DHydraulic System Page 4 -- 68
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 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 when working on hydraulic equipment.
CAUTION
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil. Controls must be operated with the
ignition switch in RUN and the engine OFF. Make
sure all electrically operated control valves are
actuated. Return ignition switch to OFF when
pressure has been relieved. Remove key from
the ignition switch.
3. Putcaps orplugs onany hydrauliclines,hydraulic fit-
tings and components left open or exposed to prevent
system contamination.
4. Put labels on disconnected hydraulic lines and
hosesforproper installationafterr epairs arecompleted.
5. Note the position of hydraulic fittings (especially el-
bow fittings) on hydraulic components before removal.
Markpartsif necessarytomake surethey willbealigned
properly when installing hydraulic hoses and tubes.
After Repair or Replacement of Components
1. Checkoillevel in thehydraulic reservoirand addcor-
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).
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
outof system(see ChargeHydraulic Systemin thissec-
tion).
7. Checkforhydraulic oilleaks.Shutoffengineandcor-
rectleaksifnecessary.Checkoillevelinhydraulic reser-
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
withthistype ofinjury.G angrene mayresultfrom
such an injury.
IMPORTANT: Checkhydraulic linesand hosesdaily
for leaks, kinked lines, loose mounting supports,
wear, loose fittings or deterioration.Make all neces-
sary repairs before operating the machine.