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Groundsmaster 5900/5910Hydraulic 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, 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. 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.
IMPORTANT: Makesuretothoroughlycleanaround
all hydraulic connections that will be disconnected
for draining.
2. Drain hydraulic reservoir.
3. Drain complete hydraulic system. Drain all hoses,
tubes and components while the system is warm.
4. Remove and replace both hydraulic oil filters.
5. Inspect and clean hydraulic reservoir (see Hydraulic
Reservoir Inspection in this section).
6. Reconnect all hydraulic hoses, tubes and compo-
nents that were disconnected while draining system.
NOTE: Useonly hydraulic fluids specifiedin the Opera-
tor’s Manual. Other fluids may cause system damage.
7. Fill hydraulic reservoir with new hydraulic fluid.
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.
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.
1. Engine ECM 2. Power connector
Figure 45
2
1
1. Hydrostat 2. Charge test port
Figure 46
2
1
9. Connect a 1000 PSI (70 Bar) pressure gauge onto
charge pressure test port fitting on hydrostat (Fig. 46).
10.Turn ignition key switch to START and engage start-
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.
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 sure that the ignition switchis OFFand the key
is removed from the switch.