Groundsmaster 4300--D Hydraulic SystemPage 4 -- 61
Check Hydraulic Lines and Hoses
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.
CAUTION
Check hydraulic lines and hoses daily for leaks, kinked
lines, loose mounting supports, wear, loose fittings or
deterioration.Makeallnecessaryrepairsbeforeoperat-
ing the machine.
Flush Hydraulic System
IMPORTANT: Flush the hydraulic system any time
thereis a severecomponent failure orthesystemis
contaminated. Contaminated oil may appear milky
or black or may contain metal particles.
IMPORTANT: If acomponent failureoccurred in the
closed loop traction circuit (e.g. piston pump or
wheel motor), filtering the traction circuit is recom-
mended.SeeFilteringClosed--LoopTractionCircuit
in this section.
1. Park machine on a level surface. Lower cutting
decks, stop engine, engage parking brake and remove
key from ignition switch.
2. Drain hydraulic reservoir. Remove suction screen
fromreservoirandcleanthoroughly.Considerremoving
and cleaning reservoir if necessary.
3. Clean area around the mounting areas of the hy-
draulic filters. Remove and discard hydraulic filters.
4. Drain entirehydraulicsystem.Drainall hoses,tubes
andcomponentswhilethesystemiswarm.Flushhoses
and tubes to remove any contamination.
5. Makesure themounting surfacesofthehydraulicfil-
tersareclean.Applycleanhydraulicoiltogasketonnew
filters. Screw filters on until gasket contacts mounting
plate, then tighten filter three quarters of a turn.
IMPORTANT: Use only hydraulic fluids specified in
Operator’sManual.Otherfluidscouldcausesystem
damage.
6. Fill hydraulic reservoir with new hydraulic oil.
7. Disconnect wire harness electrical connector from
theenginefuel stopsolenoidtopreventthe enginefrom
starting.
8. Make sure traction pedal is in neutral and the PTO
switch is OFF. Turn ignition key switch to start; engage
starter for ten (10) seconds to prime hydraulic pumps.
Wait fifteen (15) seconds to allow the starter motor to
cool and then repeat cranking procedure again.
9. Connect wire harness electrical connector to fuel
stop solenoid to allow engine to start.
10.Startengineandletitidleatlowspeedforaminimum
of two (2) minutes.
11.Increase engine speed to high idle for minimum of
one (1) minute under no load.
12.Rotate steering wheel in both directions several
times. Raise and lower cutting decks several times.
13.MovePTOswitchtoONtoengagecuttingdecksand
let them run for several minutes. Move PTO switch to
OFF.
14.Shut off engine and check for hydraulic oil leaks.
Check oillevel inhydraulicreservoir and addcorrect oil
if necessary.
15.Operate themachine fortwo(2) hoursundernormal
operating conditions.
16.Checkconditionofhydraulicoil.Ifthefluidshowsany
signsofcontamination,repeatsteps1through14again.
17.Resumenormaloperationandfollowrecommended
maintenance intervals.
Hydraulic
System
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