Section 7. Component Procedures
Model 4700 Maintenance Manual
Motor Temperature Switch Repair
Electrical Components
Motor Temperature Switch Repair
3. Disconnect cables and motor harness connections, making sure that you note locations for reassembly later.
Temperature switches for the drive and pump motors are integral to the motor. When a motor temperature switch fails, it can be replaced using the procedures that follow.
5. Remove the four bolts that secure the top end bell to the bottom end bell.
Traction Motor 1. Turn the key switch OFF and disconnect the battery connector. 2. Disconnect all cables and connectors at the motor. 3. Mark the position of the top end bell and bottom end bell relative to the stator, then remove the snap ring. 4. Remove the four bolts that secure the top end bell to the bottom end bell. 5. Remove the top end bell. Use care that the encoder bearing remains in the bottom end bell to reduce the chance of damaging the bearing. 6. Install a new temperature switch using the high temperature silicone (neutral curing) supplied with the temperature sensor. Mount the sensor close to the location of the original. Secure the cable with a cable tie to one of the power leads.
4. Separate the pump assembly from the lift pump motor and remove lift pump motor.
6. Remove the top end bell. Use care that the bearing remains in the bottom end bell to reduce the chance of damaging the bearing. 7. Install a new temperature sensor using the high temperature silicone (neutral curing) supplied with the temperature switch. Mount the sensor close to the location of the original. Secure the cable with a cable tie to one of the power leads. 8. Carefully press the top end bell to the stator. Do not pinch the cables or allow contact with the rotor. Verify correct stator installation. 9. Secure the top end bell to the bottom end bell using the four bolts previously removed. 10. Reinstall pump motor to the pump assembly. 11. Reconnect connector and power cables. 12. Reconnect the battery connector and turn the key switch ON.
7. Install the top end bell in the position that was previously marked. Verify correct stator installation and install snap ring. 8. Secure the top end bell to the bottom end bell using the four bolts previously removed. 9. Reconnect all connectors and power cables. Torque motor cable securing nuts to 18 ft. lb. (24 Nm). 10. Reconnect the battery connector and turn the key switch ON.
Pump Motor 1. Turn the key switch OFF and disconnect the battery connector. 2. Disconnect the temperature switch connector.
7-56
Publication 1160093, Issued: 20 May 2013
