Model 6210 Maintenance Manual
Section 5. Troubleshooting Symptom Tables: Travel System (Forward/Reverse)
Slow or no travel (Code C43, Traction Amplifier thermal cutback) Possible Cause
Action
Battery problems
Verify a correct, fully-charged good battery (24V) is installed in the truck.
Binding load wheel(s)
Make sure the load wheels rotate freely. If not, repair or replace. See page 7-88.
Bad drive wheel assembly
Jack and block the truck. See page 2-8. Place the Main ON/OFF Switch in the ON position. Pull the control arm down to release the brake. Check the drive wheel to see if it spins freely. If not, repair or replace. See page 7-28.
Binding brake disc
Jack and block the truck. See page 2-8. Place the Main ON/OFF Switch in the ON position. Pull the control arm down to release the brake. Check the brake disc to see if it spins freely. If not, adjust, repair, or replace. See page 7-31.
Binding traction motor
Jack and block the truck. See page 2-8. Place the Main ON/OFF Switch in the ON position. Pull the control arm down to release the brake. Check the brake disc to see if it spins freely. Turn the Main ON/OFF Switch OFF. Remove the brake disc and check the armature shaft. Remove the motor and repair or replace the drive unit or traction motor. See page 7-22 or page 7-62.
Bad drive motor (may test ok with no load, but fail under load)
Repair or replace the traction motor. See page 7-62.
Truck overloaded or operating in extreme conditions
Operate and load the truck within specifications.
Bad traction amplifier
Check the mounting of the traction amplifier. Check to make sure the traction amplifier is secure and in contact with the truck frame (acts as a heatsink). If the traction amplifier is mounted correctly, replace the traction amplifier.
Bad wire or connector
Jack and block the truck. See page 2-8. With the Main ON/OFF Switch ON and the battery connected, while attempting to travel, measure the voltage between B– and the traction amplifier TA B+, TA B–, and J1-1. If not 24V, repair or replace the wiring.
No travel (Code C42, Battery over-voltage warning) Possible Cause
Action
Battery problem
Verify a correct, fully-charged good battery is installed in the truck.
Verify battery charger is not plugged into truck
Disconnect the battery charger immediately.
Bad traction amplifier
Verify a correct battery is installed. Replace the traction amplifier.
Publication: 1146947, Revised: 12 Jan 2017
5-13
