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Groundsmaster 4000--D/4010--D Hydraulic SystemPage 4 -- 73
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--Loop TractionCircuit
in this section.
1. Park machine on a level surface. Lower cutting
decks to the ground, stop engine and apply parking
brake. Remove key from the ignition switch.
WARNING
Before disconnecting or performing any work
on the hydraulic system, all pressure in the sys -
tem must be relieved. See Relieving Hydraulic
SystemPressurein theGeneral Information sec-
tion in this chapter.
IMPORTANT: Make sure to clean around any hy-
draulic connections that will be disconnected for
draining.
2. Drain hydraulic reservoir. Remove suction screen
from reservoir and cleanthoroughly. Consider removing
and cleaning reservoir if necessary.
3. Drain hydraulic system. Drain all hoses, tubes and
components while the system is warm.
4. Change and replace both hydraulic oil filters.
IMPORTANT: Follow all local codes andregulations
when recycling or disposing hydraulic fluid and fil-
ters.
5. Inspect and clean hydraulic reservoir (see Hydraulic
Reservoir i n this section).
6. Connect all hydraulic hoses, lines and components
that were disconnected while draining system.
IMPORTANT: When filling hydraulic reservoir, use
only hydraulic fluids specified in Operator’s Manu-
al. Other fluids could cause system damage.
7. Fill hydraulic reservoir with new hydraulic fluid.
8. Prime hydraulic pumps (see Priming Hydraulic
Pumps in this section).
9. Start engineand let it run at low idle speedfor a mini-
mum of two (2) minutes. Increase engine speed to high
idle for minimum of one (1) minute under no load.
10.Raise and lower cutting decks several times. Turn
steering wheel fully left and r ight several times.
11.Shut off engine and check for hydraulic o il leaks.
Check oil level in hydraulic reservoir and add correct
amount of oil if necessary.
12.Operate machine for two (2) hours under normal op-
erating conditions.
13.Check condition of hydraulic oil. If the new fluid
shows any signs of contamination, repeat steps 1
through 12 again until oil is clean.
14.Assume normal operation and follow recommended
maintenance intervals.
Hydraulic
System