44 - FORM NO. 56043071 CMAX
™
28/34ST / I-MAX
™
28/32C, BA 750/850ST, BA 750C
WHEEL DRIVE SYSTEM
No Fwd or Rev
wheel drive
(see Figure 1).
1. Try resetting the F3
drive motor circuit
breaker (30 Amp).
2. Still no drive check
the F3 breakers
continuity
Replace the F3
(30 Amp) wheel
drive circuit
breaker
No
Check for 24 or 36V
at the A2 speed con-
trollers Battery Pos.
(+) & Battery Neg. (-)
terminals.
Repair or replace the
battery input wiring to
the A2 speed controller
Separate the motor wir-
ing harness (see note A)
& check for controller
output voltage by acti-
vating the drive paddle.
•24V machines should
have 24V Fwd &
18V in Rev.
•36V machines should
have 36V Fwd &
28V in Rev.
Repair or replace
the M1 wheel drive
motor
Yes
See part B wheel
drive control circuit
troubleshooting
guide.
No
Yes
No
Yes
TROUBLESHOOTING GUIDE ELECTRICAL
Possible Symptom
1 No forward and no reverse wheel drive
SYMPTOM ONE
Note: Do all testing with control panel R2 speed limiting pot in the maximum position, the drive wheel jacked up off the floor, key switch ON, and
the drive paddle activated (pushed Fwd or pulled into Rev.)
Note 2: Enter the Service Test Mode Program in the Electrical System manual section, for alternate machine troubleshooting procedures.
Part A: Wheel drive system motor load circuit troubleshooting guide
Note A: The drive wheel motor harness disconnect is located in the lower rear of the machine frame next to the right rear caster wheel.
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