SECTION 29 - HYDROSTATIC TRANSMISSION
29-22
HYDROSTATIC MOTOR CASE DRAIN TEST
The motors can be checked for excessive internal
leakage which will cause a unit to be weak in the
ground drive. The excessive leakage is caused by
damage to the motor rotating group or camp plate to
allow high-pressure oil to leak into the case.
Motor Case Drain Test Procedure
1. Raise the boom and rest it on the boom locks.
2. Put the Service/Run switch in the “SERVICE”
position.
3. Engage the parking brake.
4. Securely block the skid steer with all four wheels
off the ground.
5. Raise the seat to the raised latched position.
6. Remove the step shield to access the hydrostatic
motor.
7. Unhook the case drain line from the motor being
tested at 1 and cap the line.
8. Connect another line in the port of the motor and
allow the hose to drain into a suitable container.
IMPORTANT: Check the hydraulic oil level and add
if required to ensure sufficient oil for the test.
9. Start the engine and set engine speed at 2900
RPM using the EIC or a photo tach.
10. Stroke the control lever for the side being tested,
forward and reverse and take a flow reading,
MAXIMUM 1.5 GPM.
CAUTION
Always stay clear of moving parts during testing
or serious injury could occur.
11. Return control lever to neutral and stop the
engine.
12. If the test results are within specification, the
problem may be in the pump. If the results are
over the specification, remove and repair or
replace the motor.
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