User's Manual

Diagnostic Procedures

42 3A0006D

No TDC Signal (Top Dead

Center Sensor is not

detected, or motor is not

able to develop torque,

and therefore cannot put

the pump into motion)

No TDC Signal:

1. Verify that output shaft is turning.

2. Check all of the wiring.

3. Verify that sensor is operational. Remove PCB cover and monitor LED light on

the top of the sensor. The light should be normally on and it should be off for

only short period of time when top dead center is reached.

Stall:

1. Relieve system pressure.

2. Check lowers, slider cylinders, and output shaft with connecting rods for visible

damage. If no damage is visible, check for excessive heat which is a sign of fric-

tion.

3. Check the system control circuit wiring.

4. Check that the motor is turning. If not, check motor wiring.

5. Disconnect lowers and try running just the motor and gearbox.

No Position Sensor Sig-

nal (Position Sensor is not