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.
1
IMPORTANT: Change hydraulic oil filter whenever
hydraulic components are repaired or replaced.
2
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.
taminated, flush and refill hydraulic system and reser-
voir (see Flush Hydraulic System in this section).
Ifcomponentfailurewassevereorthesystemiscon-
Figure 47
1.
Engine ECM
2.
Power connector
4.
Make sure hydraulic reservoir is full. Add correct hy-
draulic oil if necessary.
2
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.
1
Figure 48
1.
Hydrostat
2.
Charge test port
6.
Connect a 1000 PSI (70 Bar) pressure gauge onto
charge pressure test port fitting on hydrostat (Fig. 48).
IMPORTANT: Before connecting the wire harness
power connector to the engine ECM, make sure that
theignitionswitchisintheOFFpositionandthekey
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.
7.
Make sure traction pedal is in the neutral position.
TurnignitionkeyswitchtoSTARTandengagestarterfor
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.
10.Connect
gine ECM (Fig. 47).
thewireharnesspowerconnectortotheen-
8.
charge pressure test port indicates that pressure in the
charge circuit is increasing.
Repeat step 7 until the pressure gauge attached to
11.
Disconnect pressure gauge from charge pressure
test port (Fig. 48).
9.
Make sure that the ignition switch is OFF and the key
is removed from the switch.
WARNING
Beforejackingupthemachine,reviewandfollow
Jacking Instructions in Chapter 1 -- Safety.
Hydraulic System
Page 4 -- 64
Groundsmaster 5900/5910
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