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, engage parking
brake, lower cutting units 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).
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 components.
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.
CAUTION
4.
Use proper tightening methods when installing hy-
draulic hoses and fittings (see Hydraulic Fitting Installa-
tion).
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.
5. After repairs, check control linkages or cables for
proper adjustment, binding, or broken parts.
6.
ponents, operate machine functions slowly until air is
out of system (see Charge Hydraulic System).
After disconnecting or replacing any hydraulic com-
3.
tings, and components left open or exposed to prevent
contamination.
Putcapsorplugsonanyhydrauliclines,hydraulicfit-
7. Checkforhydraulicoilleaks.Shutoffengineandcor-
rectleaksifnecessary.Checkoillevelinhydraulicreser-
voir and add correct oil if necessary.
4.
hosesforproperinstallationafterrepairsarecompleted.
Put labels on disconnected hydraulic lines and
5.
Note the position of hydraulic fittings (especially el-
bow fittings) on hydraulic components before removal.
Markpartsifnecessarytomakesuretheywillbealigned
properly when reinstalling hydraulic hoses and tubes.
Hydraulic System (Rev. D)
Page 4 -- 56
Groundsmaster 3500--D
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