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.
6. Connect all hydraulic hoses, lines and components
that were disconnected while draining system.
NOTE: Useonly hydraulic fluids specifiedintheOpera-
tor’s Manual. Other fluids may cause system damage.
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.
7.
8.
Fill hydraulic reservoir with new hydraulic fluid.
Disconnect electrical connector from engine run so-
lenoid.
9.
(10)
seconds to allow the starter motor to cool and then re-
peat cranking procedure again.
Turn ignition key switch and engage starter for ten
seconds toprimehydraulic pumps.Waitfifteen(15)
1.
decks to the ground, stop engine and apply parking
brake. Remove key from the ignition switch.
Park machine on a level surface. Lower cutting
10.Connect
electrical connector to engine run solenoid.
WARNING
11.
Start engine and let it idle at low speed (1450 RPM)
for a minimum of two (2) minutes. Increase engine
speed to high idle (2870 RPM) for minimum of one (1)
minute under no load.
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.
12.Raise
and lower cutting decks several times. Turn
steering wheel fully left and right several times.
IMPORTANT: Make sure to clean around any hy-
draulic connections that will be disconnected for
draining.
13.Shut
Check oil level in hydraulic reservoir and add correct
amount of oil if necessary.
off engine and check for hydraulic oil leaks.
2.
fromreservoir andcleanthoroughly.Consider removing
and cleaning reservoir if necessary.
Drain hydraulic reservoir. Remove suction screen
14.Operate
erating conditions.
machine for two (2) hours under normal op-
15.Check
shows any signs of contamination, repeat steps 1
through 14 again until oil is clean.
condition of hydraulic oil. If the new fluid
3.
components while the system is warm.
Drain hydraulic system. Drain all hoses, tubes and
4.
5.
Change and replace both hydraulic oil filters.
16.Assume
maintenance intervals.
normal operation and follow recommended
Inspect and clean hydraulic reservoir (see Hydraulic
Reservoir Inspection in this section).
Groundsmaster 4000--D/4010--D
Page 4 -- 73
Hydraulic System
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