Service and Repairs
General Precautions for Removing and Installing Hydraulic System Components
Before Repair or Replacement of Components
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.
After Repair or Replacement of Components
1.
1. Checkoillevelinthehydraulic reservoir andaddcor-
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.
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.
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.
WARNING
4.
Use proper tightening methods when installing hy-
draulic hoses and fittings (see Hydraulic Hose andTube
Installation and Hydraulic Fitting Installation in the Gen-
eral Information section of this chapter).
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.
5.
proper adjustment, binding or broken parts.
After repairs, check control linkages or cables for
6.
After disconnecting or replacing any hydraulic com-
3.
tings and components left open or exposed to prevent
contamination.
Putcapsorplugsonanyhydrauliclines,hydraulicfit-
ponents, operate machine functions slowly until air is
out ofsystem (see Charge Hydraulic System in this sec-
tion).
4.
hosesforproperinstallationafterrepairsarecompleted.
Put labels on disconnected hydraulic lines and
7.
rectleaksifnecessary.Checkoillevelinhydraulicreser-
voir and add correct oil if necessary.
Checkforhydraulicoilleaks.Shutoffengineandcor-
5.
Note the position of hydraulic fittings (especially el-
bow fittings) on hydraulic components before removal.
Markpartsifnecessarytomakesuretheywillbealigned
properly when installing hydraulic hoses and tubes.
Check Hydraulic Lines and Hoses
IMPORTANT: Checkhydraulic linesandhosesdaily
for leaks, kinked lines, loose mounting supports,
wear, loose fittings or any hose deterioration. Make
all necessary repairs before operating.
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.
Hydraulic System
Page 4 -- 72
Groundsmaster 4000--D/4010--D
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