FORM NO. 56043071 CMAX
™
28/34ST / I-MAX
™
28/32C, BA 750/850ST, BA 750C - 43
WHEEL DRIVE SYSTEM
-
+
1
2
3
4
5
6
R
E
D
/
B
L
K
A2
(Partial)
BRN
VIO
GRA
BRN/WHT
GRN/ YEL
BRN/WHT
2
1
VIO
P1
Key Switch
R2 25K Ohms
R1 5K Ohms
3
BLK #1
BLK #2
RED/BLK
GRA
reverse
wiper
forward
2
1
3
FRONT
Chain
Drive Wheel
Drive Wheel
Mot or
R2 Potentiometer
(25,000 Ohms)
R1 Potentiometer
(5,000 Ohms)
Brake (Optional)
Control Panel
Display
(Touch Pad)
WHEEL DRIVE TROUBLESHOOTING GUIDE
Problem Possible Cause
• Wheel drive motor will not run in forward and reverse. See Electrical Troubleshooting Flowcharts A & B in this section.
• Wheel drive in one direction only, loss of either Controller can’t change electrical polarity to wheel motor.
forward or reverse. Replace the (A2) 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 R1 drive pot is out of adjustment. Reset to neutral the 5000
Ohm drive paddle potentiometer (*).
• During normal machine transporting the operator The R2 (25,000 Ohm) speed limiting pot wiper is either open
adjusts the R2 speed limit pot and there is no effect where the machine runs at minimum speed or the pot wiper
on the machine’s speed output. is shorted and runs at maximum speed. Before replacing the
R2 pot (**), check for a loose/disconnected wire.
* 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 system.
FIGURE 3
FIGURE 2
R2 Voltage Values R1 Voltage Values
0V = Minimum Speed 0 – 2.5V Forward
5V = Maximum Speed 2.5V – 5V Reverse
This drawing shows additional controller input circuit detail. The R2 pot is shown at the Max speed setting and the R1 pot in neutral.
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