HYDRAULICS
8N-48
MOWER (REEL MOWER) SYSTEM
TEST
The reel motor circuit consists of the reel (auxiliary)
hydraulic pump, reel motor control valve, five reel
motors, and reel switch. This test will determine if the
reel motor is at fault (Figure 8N-4). There are practical
field tests to isolate the control valve or pump. An
instrument test must be performed as described in
Section 8O.
NOTE:
The case drain on a hydraulic motor is used to
return excess or bypassed hydraulic oil to the
hydraulic tank.
1. Shut down the engine and remove the ignition
key.
2. Remove the case drain hose from the reel motor.
Immediately plug the hose.
3. Position a drain pan (minimum capacity 1 gallon
(3.8 liters)) near the reel motor.
4. Install a separate hose on the case drain fitting
and place the free end in the container.
5. Set the parking brake, start the engine and place
the reel switch in the forward (ON) position. Run
the engine for one full minute.
6. Shut down the engine and remove the ignition
key.
7. Measure the amount of oil collected from the case
drain in one minute.
Conclusion
• If oil from the case drain is within a half pint per
minute, the motor is not at fault, proceed with an
instrument test (Section 8O).
• If the oil from the case drain is more than 1-1/2 pints
per minute the motor may be faulty and should be
repaired or replaced.
8. Remove the separate hose from the motor and
plug from the hydraulic hose. Connect the hydrau-
lic hose to the reel motor.
Figure 8N-4. Reel Motor Test
TRACTION MOTOR TEST
The front traction case drain is used to return excess of
bypassed hydraulic oil to the hydraulic tank.
1. Shut down the engine and remove the ignition
key.
2. Remove the case drain hose from the traction
motor. Immediately plug the hose.
3. Position a drain pan (minimum capacity 1 gallon
(3.8 liters)) near the wheel motor.
4. Install a separate hose on the case drain fitting
and place the free end in the container.
5. Lift the mower and support with jack stands.
6. Start the engine and place the traction pedal in the
forward position. Run the engine for one full
minute.
7. Shut down the engine and remove the ignition
key.
8. Measure the amount of oil collected from the case
drain in one minute.
Case Drain Hose
Separate HoseReel Motor
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