FORM NO. 56043056 ConvertaMAX™ 20/26 / BA 550/650 - 39
WHEEL DRIVE SYSTEM
FRONT
Chain
Drive Wheel
Drive Wheel Motor
R1 Potentiometer
(25,000 Ohms)
R2 Potentiometer
(5,000 Ohms)
WHEEL DRIVE TROUBLESHOOTING GUIDE
Problem
Possible Cause
• No forward or reverse wheel drive.
See Electrical Troubleshooting Flowcharts A & B.
• No wheel drive in one direction,
Controller can’t change electrical polarity to wheel motor.
loss of either forward or reverse.
Replace the (A1) speed control.
• Machine creeps (moves) in forward or
• Check movement of the drive paddle spring centering device
reverse with only the key switch ON.
(auto dead-man return to neutral components). Repair or replace
needed parts.
• The R2 drive pot is out of adjustment. Reset to neutral the 5000
Ohm drive paddle potentiometer (*).
• During normal machine transporting with the 5K
The R1 (25,000 Ohm) speed limiting pot wiper is either open
drive paddle pot activated the operator also adjusts
where the machine runs at minimum speed or the pot wiper
the control panel maximum speed limiting R1 pot and
is shorted and runs at maximum speed. Replace the R1 pot (**).
does not affect the desired maximum machine speed
output.
* See
Potentiometer Installation and Adjustment
instructions in this manual section and reset the (5K) pot to neutral.
** See
25K Wheel Drive Speed Limit Potentiometer Testing
instructions in this manual section.
FIGURE 3
revised 9/01