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, tubes, and compo-
nents that were disconnected while draining system.
NOTE: Useonly hydraulic fluids specifiedintheOpera-
tor’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.
Operator’s Manual).
Fill hydraulic reservoir with new hydraulic fluid (see
8.
lenoid.
Disconnect electrical connector from engine run so-
1.
decks,stopengine,andengageparkingbrake.Remove
key from the ignition switch.
Park machine on a level surface. Lower cutting
9.
onds to prime hydraulic pumps. Wait 15 seconds to al-
low the starter to cool and then repeat this step again.
Turn ignition key switch; engage starter for 15 sec-
10.Connect
electrical connector to engine run solenoid.
CAUTION
11.
Startengineandletitrunatlowidle (1375 + 50RPM)
for a minimum of 2 minutes. Increase engine speed to
high idle (2730 + 30 RPM) for aminimum of1minuteun-
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 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.
Drain hydraulic reservoir (see Operator’s Manual).
14.Operate
conditions.
machinefor2hoursundernormaloperating
3.
Drain hydraulic system. Drain all hoses, tubes, and
components while the system is warm.
Change and replace both hydraulic oil filters (see
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.
Operator’s Manual).
5.
Inspect and clean hydraulic reservoir (see Hydraulic
Reservoir Inspection in the Service and Repairs section
of this chapter).
16.Assume
maintenance intervals.
normal operation and follow recommended
Hydraulic System
Page 4 -- 50
Groundsmaster 4100--D
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