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Groundsmaster 4000--DHydraulic System (Rev. B) Page 4 -- 50
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).
IMPORTANT: Flush hydraulic system when chang-
Ing from petroleum base hydraulic fluid to a biode-
gradable fluid such as Mobil EAL 224H. Operate
machine under normal operating conditions for at
least four (4) hours before draining.
1. Park machine on alevel surface. Lower cutting units,
stop engine, and engage 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. Controls must be operated with the
ignition switch in OFF. Remove key from the igni-
tion switch.
IMPORTANT: Make sure to clean around any hy-
draulic connections that will be disconnected for
draining.
2. Drain hydraulic reservoir (see Operator’s Manual).
3. Drain hydraulic system. Drain all hoses, tubes, and
components while the system is warm.
4. Change and replace both hydraulic oil filters (see
Operator’s Manual).
5. Inspect and clean hydraulic reservoir (see Hydraulic
Reservoir Inspection).
6. Reconnect all hydraulic hoses, lines, and compo-
nents that were disconnected while draining system.
NOTE: Useonly hydraulic fluids specified in the Opera-
tor’s Manual. Other fluids may cause system damage.
7. Fill hydraulic reservoir with new hydraulic fluid (see
Operator’s Manual).
8. Disconnect electrical connector from engine run so-
lenoid.
9. Turn ignition key switch; engage starter for 10 se-
conds to prime pump. 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 2 minutes. Increase engine speed to
high idle (2730 +
30 RPM) for minimum of 1 minute un-
der no load.
12.Raise and lower cutting units 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 for2 hours under normaloperating
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. If changing to biode-
gradable fluid, repeat steps 1 through 14 again at least
once and until the oil is clean.
16.Assume normal operation and follow recommended
maintenance intervals.