KB21 Service Manual Pub 09-14
82
Mowers & Spindles
Motor Runs Too Slow, or Stops Under Load:
Engine RPM too Slow
Pump or pump drive failure
Faulty solenoid at pump or motor control
Air in the oil
Restrictions in the system
Excessive hose bend or crimping
Internal hose failure
Incorrect hose sizing or material
Contamination.
Excessive internal leakage due to wear (contamination)
Relief valve malfunction (relieving too soon)
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 (warranty issue)
Faulty motor
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