SECTION 29 - HYDROSTATIC TRANSMISSION
29-14
HYDROSTATIC CHARGE SYSTEM
PRESSURE TEST
Hydrostatic charge pressure oil is the return oil from
the boom, bucket, and auxiliary hydraulic circuits
from the return side of the control valve. This oil is
required for replenishing oil to the hydrostatic system
for lubrication and cooling of the hydrostatic pumps
and motors.
IMPORTANT: Do not change the route of the return
oil from the main control valve or the hydrostatic
system may be damaged.
The charge pressure can be checked at the test port,
1, near the charge check valve, 2.
The charge system pressure is factory set. Changes
to the settings should not be necessary. The charge
check relief valve is located at 2. If there is some
reason to suspect incorrect pressure, check the
pressure as follows:
10
Checking Charge System Pressure
Fittings and gauge required:
1. 22 bar (300 PSI) gauge (minimum)
2. 1/8″ pipe to gauge
Test Procedure
1. Raise the boom and rest on the boom locks.
2. Put the “SERVICE/RUN” switch in the
“SERVICE” position.
3. Disengage the parking brake.
4. Securely block the skid steer with all four wheels
off the ground. Support the front of the loader at
1, to the front of the final drive case and at 2, to
the rear of the case.
CAUTION
Failure to securely support the skid steer could
result in movement of the loader during testing
causing serious injury or damage to the
equipment.
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