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).
6. Reconnect all hydraulic hoses, lines, and compo-
nents that were disconnected while draining system.
NOTE: Use only hydraulic fluids specified in the Trac-
tion Unit Operator’s Manual. Other fluids may cause
system damage.
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.
7.
Fill hydraulic reservoir with new hydraulic fluid (see
Traction Unit Operator’s Manual).
8.
Disconnect electrical connector from engine run so-
lenoid.
1.
Park machineonalevelsurface.Lower cuttingunits,
stop engine, and engage parking brake. Remove key
from the ignition switch.
9.
conds to prime pump. Repeat this step again.
Turn ignition key switch; engage starter for 10 se-
10.Connect
electrical connector to engine run solenoid.
CAUTION
11.
Start engine and let it idle at low speed (1300 RPM)
for a minimum of 2 minutes. Increase engine speed to
high idle (2800 + 50 RPM) for minimum of 1 minute un-
der no load.
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil. Controls must be operated with the
ignition switch inOFF.Remove key from the igni-
tion switch.
12.Raise
and lower cutting units 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.
tor’s Manual).
Drain hydraulic reservoir (see Traction Unit Opera-
14.Operate
conditions.
machinefor2hoursundernormaloperating
3.
components while the system is warm.
Drain hydraulic system. Drain all hoses, tubes, and
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.
4.
Traction Unit Operator’s Manual).
Change and replace both hydraulic oil filters (see
5.
Reservoir Inspection).
Inspect and clean hydraulic reservoir (see Hydraulic
16.Assume
maintenance intervals.
normal operation and follow recommended
Groundsmaster 4500--D/4700--D
Page 4 -- 53
Hydraulic System (Rev. A)
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