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Groundsmaster 4000--DHydraulic System Page 4 -- 62
Flush Hydraulic System
IMPORTANT: Flush the hydraulic system any time
there is a severe component failure or the system is
contaminated (oil appears milky, black or contains
metal particles).
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.
CAUTION
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil.
IMPORTANT: Make sure to clean around any hy-
draulic connections that will be disconnected for
draining.
2. Drain hydraulic reservoir.
3. Drain hydraulic system. Drain all hoses, tubes and
components while the system is warm.
4. Change and replace both hydraulic oil filters.
5. Inspect and clean hydraulic reservoir (see Hydraulic
Reservoir Inspection in this section).
6. Connect all hydraulic hoses, lines and components
that were disconnected while draining system.
NOTE: Useonly hydraulicfluids specifiedin the Opera-
tor’s Manual. Other fluids may cause system damage.
7. Fill hydraulic reservoir with new hydraulic fluid.
8. Disconnect electrical connector from engine run so-
lenoid.
9. Turn ignition key switch and engage starter for ten
(10) seconds to prime hydraulic pumps. Repeat this
step again.
10.Connect electrical connector to engine run solenoid.
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.
12.Raise and lower cutting decks several times. Turn
steering wheel fully left and right several times.
13.Shut off engine and check for hydraulic oil leaks.
Check oil level in hydraulic reservoir and add correct
amount of oil if necessary.
14.Operate machine for two (2) hours under normal op-
erating conditions.
15.Check condition of hydraulic oil. If the new fluid
shows any signs of contamination, repeat steps 1
through 14 again until oil is clean.
16.Assume normal operation and follow recommended
maintenance intervals.