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
withthistype of injury.Gangrene may result from
such an injury.
CAUTION
Check hydraulic lines and hoses daily for leaks, kinked
lines, loose mounting supports, wear, loose fittings or
deterioration. Make allnecessary repairs beforeoperat-
ing the machine.
Flush Hydraulic System
IMPORTANT: Flush the hydraulic system any time
there is a severe component failure or the system is
contaminated. Contaminated oil may appear milky
or black or may contain metal particles.
IMPORTANT: If a component failure occurred 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
from reservoir and cleanthoroughly.Consider removing
and cleaning reservoir if necessary.
3. Clean area around the mounting areas of the hy-
draulic filters. Remove and discard hydraulic filters.
4. Drain entire hydraulic system. Drain all hoses, tubes
and componentswhile thesystem is warm. Flush hoses
and tubes to remove any contamination.
5. Make sure the mounting surfaces of the hydraulic fil-
tersareclean.Applyclean hydraulicoil togasketonnew
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
the engine fuel stop solenoid to prevent the engine from
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.Start engine andlet it idle atlow speedfor aminimum
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.Move PTO switch toON to engage cuttingdecks and
let them run for several minutes. Move PTO switch to
OFF.
14.Shut off engine and check for hydraulic oil leaks.
Check oil level in hydraulic reservoir and add correct oil
if necessary.
15.Operate the machine for two (2) hours under normal
operating conditions.
16.Check condition ofhydraulicoil.If thefluidshowsany
signs of contamination, repeat steps 1 through 14again.
17.Resume normal operation and follow recommended
maintenance intervals.
Hydraulic
System
