Tommy Gate Repair

   Condensation and rain are not a good thing when the drainage points on your Tommy Gate block up and water fills to a point where corrosion on the motor makes the gate stop functioning.  The steps that I used to repair the problem follow:  (The Tommy Gate that I repaired was on the back of a 1993 F-150)

 

 

 

Failure Mode: The lift quit working (no motor sound).

Special Equipment Fluke Digital Volt Meter (DVM) or equivalent.

Trouble shooting:

  1. Lower the Tommy Gate to relieve hydraulic press in the system and gain access to the Tommy Gate cover bolts.

  2. "Warning"  - Exposed terminals are under the cover.

  3. Remove the Tommy Gate cover at the rear of the truck. (Observe the solenoid/switch and control linkage on top of the  motor/pump assembly).

  4.  "Warning" - These next steps apply battery power to the pump motor.  (The lift may operate/move)

  5. Measure the voltage between the chassis (ground) and terminal which connects to the battery. The voltage should be approximately 12VDC.  If it's not you have a problem between the battery source and the input terminal.

  6. If 12VDC was present in the previous step, prepare to measure the voltage on the second terminal (which connects to the motor), stand clear of the lift and actuate the control linkage to lift the gate and take measurement.  The voltage should be close to the previous reading. If it's not the solenoid/switch may be bad.  Disconnect both battery terminals and perform a continuity test across the solenoid/switch measuring resistance.   If the resistance is high the switch is bad.

  7. If 12VDC was present in the previous step, prepare to measure the voltage on the Motor terminal, stand clear of the lift and actuate the control linkage to lift the gate and take measurement.  The voltage should be close to the previous reading. If it's not the connecting cable may be bad.  Verify/Disconnect both battery terminals and perform a continuity test across the short cable measuring resistance.   If the resistance is high the cable is bad.

  8. If 12VDC was present in the previous step, the motor has failed the motor/assembly needs to be removed and repaired.

Removal Steps

  1. Verify/Disconnect Positive and Negative battery connections.

  2. Disconnect the battery connection from motor/pump assembly.

  3. Disconnect the Up/Down linkage from motor/pump assembly.

  4. Disconnect the two hydraulic linkages from motor/pump assembly.

  5. Remove the two nuts and bolts holding the motor/pump assembly to the bottom of the Tommy Gate.

  6. Remove the motor/pump assembly from the Tommy Gate (It's heavy)

  7. At this point I disassembled the motor/pump assembly. The motor was removed by loosening the two long bolts at the brush end of the electric motor.

 

     
     

 

 

Disassembled pictures note the corrosion and new motor.

I found a local distributor for Tommy Lift here http://www.tommygate.com/

Installation steps:

  1. After the purchase of a new motor step 1 thru 7 above were performed in reverse order connecting and installing items that were removed or disconnected.

  2. Hydraulic fluid was added.

  3. The lift was cycled 5 times and lowered all of the way down and the hydraulic fluid checked.

  4. "Warning"  - Exposed terminals are under the cover.

  5. Install the Tommy Gate cover at the rear of the truck.

Operation Complete.