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Groundsmaster 4000--D/4010--DHydraulic System Page 4 -- 72
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 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. Put caps or plugs on any hydrauliclines, hydraulicfit-
tings and components left open or exposed to prevent
contamination.
4. Put labels on disconnected hydraulic lines and
hoses for proper installation after repairs arecompleted.
5. Note the position of hydraulic fittings (especially el-
bow fittings) on hydraulic components before removal.
Mark parts if necessary to make sure theywill be aligned
properly when installing hydraulic hoses and tubes.
After Repair or Replacement of Components
1. Check oil level in the hydraulic 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 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 Hoseand Tube
Installation and Hydraulic Fitting Installation in the Gen-
eral 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. Checkforhydraulicoilleaks. Shutoff engineandcor-
rectleaksif necessary.Check oil levelinhydraulicreser-
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.Gangrene may result from
such an injury.
IMPORTANT: Check hydraulic linesand hosesdaily
for leaks, kinked lines, loose mounting supports,
wear, loose fittings or any hose deterioration. Make
all necessary repairs before operating.