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. Putcapsorplugsonanyhydrauliclines,hydraulicfit-
tings and components left open or exposed to prevent
system contamination.
4. Put labels on disconnected hydraulic lines and
hosesforproperinstallationafterrepairsarecompleted.
5. Note the position of hydraulic fittings (especially el-
bow fittings) on hydraulic components before removal.
Markpartsifnecessarytomakesuretheywillbealigned
properly when installing hydraulic hoses and tubes.
After Repair or Replacement of Components
1. Checkoillevelinthehydraulicreservoirandaddcor-
rect oil if necessary. D rain and refill hydraulic system
reservoir and change oil filter if component failure was
severe or system is contaminated (see Flush H ydraulic
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-
draulichosesandfittings (see Hydraulic FittingInstalla-
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
outofsystem(seeChargeHydraulicSysteminthissec-
tion).
7. Checkforhydraulicoilleaks.Shutoffengineandcor-
rectleaksifnecessary.Checkoillevelinhydraulicreser-
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
withthistypeofinjury.Gangrenemayresultfrom
such an injury.
IMPORTANT: Checkhydrauliclinesandhosesdaily
for leaks, kinked lines, loose mounting supports,
wear,loose fittingsordeterioration. Makeall neces-
sary repairs before operating the machine.
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