Toro Greensmaster 3250-D 04383 Service Manual page 75

Procedure for Wheel Motor Efficiency Test
Note: Over a period of time, a wheel motor can wear
internally. A worn motor may by--pass oil to its case drain
causing the motor to be less efficient. Eventually,
enough oil loss will cause the wheel motor to stall under
heavy load conditions. Continued operation with a worn,
inefficient motor can generate excessive heat, cause
damage to seals and other components in the hydraulic
system, and affect overall machine performance.
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting
units lowered and off. Make sure engine is off and the
parking brake is engaged.
3. Read Precautions for Hydraulic Testing.
4. Make sure that traction pedal is adjusted to the neu-
tral position (see Adjust Traction Drive for Neutral in the
Adjustments Section).
5. Attach a heavy chain to the rear of the machine
frame and an immovable object to prevent the machine
from moving during testing.
6. If machine has 3 wheel drive, block up the rear
wheel off the ground to allow flow through the rear wheel
motor.
7. Chock front wheel being tested to prevent rotation
of the wheel. Make sure parking brake is on.
8. Disconnect hydraulic lines from front wheel motor
that is not being tested. Cap the disconnected hydraulic
lines and plug ports in wheel motor (see Special Tools).
9. Disconnect hose from the upper hydraulic fitting on
the side of the hydrostat.
10. Install tester with pressure gauge and flow meter in
series with the pump and the disconnected hose (same
tester connections as Traction Drive Hydrostat (P3)
Flow Test). Make sure the tester flow control valve is
fully open.
CAUTION
Use extreme caution when performing test. The
wheel being tested will be trying to move the ma-
chine.
11. Start engine and move throttle to full speed (2750 +
50 RPM).
Greensmaster 3250--D
12. Slowly push traction pedal in forward direction until
1000 PSI (69 bar) is displayed on the tester pressure
gauge.
13. Wheel motor internal leakage will be shown on flow
meter in GPM. Flow should be less than 1.5 GPM for
the tested wheel motor.
14. Release traction pedal, rotate wheel being tested,
and retest. Testing of wheel motor leakage in three dif-
ferent wheel positions will provide most accurate test re-
sults.
15. Release traction pedal and shut engine off. Record
results of flow test.
16. If specification is not met, the tested wheel motor
needs to be repaired or replaced as necessary.
17. Test second front wheel motor. Reconnect hydraulic
lines to untested front wheel motor. Disconnect and cap
hydraulic lines to tested front wheel motor. Complete
steps 11 to 16 for the second front wheel motor.
18. If machine has 3 wheel drive, test rear wheel motor:
A. Both front wheel motors should have hydraulic
lines connected. Block up both front wheels off the
ground. Release parking brake so front wheels can
turn freely.
B. Attach a heavy chain to the rear of the machine
frame and an immovable object to prevent the ma-
chine from moving during testing.
C. Position rear wheel on the ground and chock
rear wheel to prevent it from turning.
Use extreme caution when performing test. The
rear wheel will be trying to move the machine.
D. Complete steps 11 to 16.
19. Disconnect tester from hydraulic fitting and hose.
Reconnect hose to pump connection.
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CAUTION
Hydraulic System (Rev. I)