Groundsmaster 4100--D/4110--DHydraulic System Page 4 -- 74
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 deck 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.
WARNING
Before disconnecting or performing any work
on the hydraulic system, all pressure in the sys-
tem must be relieved. See Relieving Hydraulic
SystemPressureintheGeneralInformationsec-
tion in this chapter.
3. Putcapsorplugsonanyhydrauliclines,hydraulicfit-
tings and components left open or exposed to prevent
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 reinstalling hydraulic hoses and tubes.
After Repair or Replacement of Components
1. Checkoillevelinthehydraulicreservoirandaddcor-
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 w ith c lean hydraulic oil
before installing hydraulic components.
3. Make sure all caps or plugs are removed from hy-
draulic tubes, hydraulic fittings and components before
reconnecting.
4. Use proper tightening methods when installing hy-
draulichosesandfittings (see Hydraulic FittingInstalla-
tion and Hydraulic Hose and Tube Installation 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 fittings ordeterioration. Makeallneces-
sary repairs before operating.
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