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Groundsmaster 5900/5910Hydraulic System Page 4 -- 64
Charge Hydraulic System
NOTE: When initially starting the hydraulic system with
new or rebuilt components such as motors,pumps or lift
cylinders, it is important that the hydraulic system be
charged properly. Air must be purged from the system
and its components to reduce the chance of damage.
IMPORTANT: Change hydraulic oil filter whenever
hydraulic components are repaired or replaced.
1. Position machine on a level surface. Remove key
from the ignition switch.
2. Make sure all hydraulic connections, lines and com-
ponents are tight.
3. Ifcomponent failure was severe or the system is con-
taminated, flush and refill hydraulic system and reser-
voir (see Flush Hydraulic System in this section).
4. Make sure hydraulic reservoir is full. Add correct hy-
draulic oil if necessary.
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 harness
power connector is removed from the engine ECM
while electrical power is on, the ECM may be dam-
aged.
5. 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. 47).
Thiswillkeeptheenginefromstartingwhilecrankingthe
engine.
6. Connect a 1000 PSI (70 Bar) pressure gauge onto
charge pressure test port fitting on hydrostat (Fig. 48).
7. Make sure traction pedal is in the neutral position.
Turn ignition key switch to STARTandengagestarterfor
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.
8. Repeat step 7 until the pressure gauge attached to
charge pressure test port indicates that pressure in the
charge circuit is increasing.
9. Make sure that the ignition switch is OFF and the key
is removed from the switch.
1. Engine ECM 2. Power connector
Figure 47
2
1
1. Hydrostat 2. Charge test port
Figure 48
2
1
IMPORTANT: Before connecting the wire harness
power connector to the engine ECM, make sure that
the ignition switchisin the OFFposition and thekey
is removed from the switch. If the harness power
connector is plugged into the engine ECM while
electrical power is on,the ECM may be be damaged.
10.Connect thewireharnesspowerconnectortothe en-
gine ECM (Fig. 47).
11.Disconnect pressure gauge from charge pressure
test port (Fig. 48).
WARNING
Before jacking up the machine, review and f ollow
Jacking Instructions in Chapter 1 -- Safety.