KB21 Service Manual Pub 09-14
81
Mowers & Spindles
Motor Inoperative (Won’t Run):
Solenoid valve (gear systems) on motor control valve not working
Pump failure
Spindle locked up due to bearing failure.
Motor running too hot: (100 °F over the ambient temp)
Oil level too low
Incorrect oil used (universal tractor hydraulic oil)
Air in oil (foamy appearance)
Engine RPM too high (in excess of 2200 RPM)
Overload of mower
Excessive ground speed
Excessive ground contact
Excessive internal leakage due to wear (contamination)
Relief valve malfunction (relieving too soon)
Restrictions in the system
Excessive hose bend or crimping
Internal hose failure
Incorrect hose sizing or material
Contamination.
Faulty motor
Motor Mount Flange (Spindle Housing) Breaking or Cracking:
This is normally
due to improper torque or loss of torque of the motor mount bolts.
See proper installation instructions in the Product Service and Operator’s manuals to obtain the correct
torque and clearance parameters required.
Motor shaft failure due to extreme overload of the cutter.
No oil flow to the motor.
Motor Shaft (external leakage into the spindle).
Shaft seal worn due to debris or overpressure from spindle (vent plugged).
Shaft seal falling out of bore due to retainer failure.
Shaft seal bore incorrect size.
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