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
1.
decks, stop engine and apply parking brake. Remove
key from the ignition switch.
Park machine on a level surface. Lower cutting
2
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 RUN and the engine OFF. Make
sure all electrically operated control valves are
actuated. Return ignition switch to OFF after
pressure has been relieved. Remove key from
the ignition switch.
Figure 45
1.
Engine ECM
2.
Power connector
2
IMPORTANT: Makesuretothoroughlycleanaround
all hydraulic connections that will be disconnected
for draining.
2.
3.
Drain hydraulic reservoir.
Drain complete hydraulic system. Drain all hoses,
tubes and components while the system is warm.
4.
5.
Remove and replace both hydraulic oil filters.
1
Inspect and clean hydraulic reservoir (see Hydraulic
Reservoir Inspection in this section).
Figure 46
6.
Reconnect all hydraulic hoses, tubes and compo-
nents that were disconnected while draining system.
1.
Hydrostat
2.
Charge test port
9.
charge pressure test port fitting on hydrostat (Fig. 46).
Connect a 1000 PSI (70 Bar) pressure gauge onto
NOTE: Useonly hydraulic fluids specifiedintheOpera-
tor’s Manual. Other fluids may cause system damage.
10.Turn
ignition key switch to START and engage start-
7.
Fill hydraulic reservoir with new hydraulic fluid.
er for thirty (30) seconds to prime the traction and gear
pumps. Wait two (2) minutes to allow the starter to cool
and then repeat this step again.
IMPORTANT: Before unplugging the wire harness
power connector from the engine ECM, make sure
that the ignition switch is in the OFF position and
the key is removed from the switch. If the power
connector is removed from the engine ECM while
electrical power is on, the ECM may be damaged.
11.
Repeat step 10 until the pressure gauge attached to
charge pressure test port indicates that pressure in the
charge circuit is increasing.
12.Make
is removed from the switch.
sure that the ignition switch is OFF and the key
8.
Make sure that the ignition switch is OFF and the key
is removed from the switch. Unplug the wire harness
power connector from the engine ECM to prevent the
engine fuel solenoid from being energized (Fig. 45).
Thiswillkeeptheenginefromstartingwhilecrankingthe
engine.
Hydraulic System
Page 4 -- 62
Groundsmaster 5900/5910
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