HYDROSTATIC POWER TRAIN
4181383 First Edition 5-13
5
2. Install wheel restraints (1) to both front wheels.
3. Lift the machine so that rear wheels are off the
ground and support with stands.
4. Lower the cutting units and move throttle lever to full
throttle. Slowly push the traction pedal forward.
Does the engine labor or stall?
YES The traction pump is not faulty.
NO A fault exists in the hydrostatic drive circuit,
including the traction pump or wheel motors.
Proceed to instrument test. (See “Instrument
Test Procedures” on page 5-14.)
Wheel Motor Test
The wheel motor case drain is used to return lubrication
oil or bypassed hydraulic oil to the hydraulic tank.
1. Operate hydraulic system until oil temperature is at
120—150°F (49—65°C).
2. Stop the engine, apply brake, and remove the ignition
key.
3. Remove the case drain hose from the wheel motor.
Immediately plug the hose.
4. Position a drain pan with a minimum capacity of 1
gallon (3.8 L) near the wheel motor.
5. Install a separate hose on the case drain fitting and
place the free end in the container. Secure the hose
to prevent spills.
NOTES
s
• When testing rear wheel motor, put wheel restraints
on the rear wheels, lift front of machine so that front
wheels are off the ground and support with jack
stands.
• When testing front wheel motor, put wheel restraints
on the front wheels, lift rear of machine so that rear
wheels are off the ground and support with jack
stands.
6. Install wheel restraints. See Figure 5-8.
7. Lift and support the rear or front of the machine,
depending on wheel being tested.
8. Start the engine, release brake, and place the
traction pedal in the forward position for 15 seconds.
9. Stop the engine, apply brake, and remove the ignition
key.
10. Measure the amount of oil collected from the case
drain. Amount x 4 = amount per minute.
Is the oil measured less than 1 gallon per
minute?
YES The motor is not faulty. Proceed to
instrument test. (See “Instrument Test
Procedures” on page 5-14.)
Is the oil measured more than 2 gallons per
minute?
YES The motor is faulty. Repair or replace as
needed. (See “Front Wheel Motor” on
page 5-34.) or (See “Rear Wheel Motor” on
page 5-39.)
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