BL-CB33-0115 - 03-01-2018 4-1
SECTION 4
TROUBLESHOOTING
4-1. GENERAL
Use Table 4-1 as a guide to determine possible
causes of trouble. The table is divided into five main
categories: Truck and Hydraulic System Will Not Oper-
ate: Truck Does Not Operate Forward or Reverse:
Trouble With Braking: Trouble With Lifting Or Lower-
ing, and Miscellaneous malfunctions.
Table 4-1 Troubleshooting Chart
MALFUNCTION PROBABLE CAUSE CORRECTIVE ACTION
TRUCK AND HYDRAULIC
SYSTEM WILL NOT OPER-
ATE
Truck will not travel nor will lift sys-
tem operate.
a. Fuse blown. Check fuse and replace if
necessary.
b. Battery dead or disconnected. Check battery quick-disconnect
plug and check battery voltage.
c. Keyswitch defective. Bypass keyswitch to determine if it
is malfunctioning.
d. Defective wiring. Check for open circuit. Repair as
required.
TRUCK DOES NOT OPERATE
FORWARD OR REVERSE
Truck does not travel forward or
reverse. All other functions
operate normally.
a. Check all wiring. A loose con-
nection may be the cause of
malfunction.
Tighten all loose connections
before further troubleshooting.
b. Defective deadman switch. Check and replace switch if
defective.
c. Defective main contactor. Check for proper operation and
replace if necessary.
d. Defective potentiometer. Check and replace potentiometer
if defective.
Truck travels forward but not in
reverse.
Defective potentiometer in control
head.
Check and replace potentiometer
if defective.
Truck travels reverse but not in
forward.
Defective potentiometer in control
head.
Check and replace potentiometer
if defective.
Truck travels forward and in
reverse at lower speeds; will
not travel at high speed.
Defective potentiometer in control
head.
Check and replace potentiometer
if defective.
TROUBLE WITH BRAKING
Truck does not slow with brake, or
brake does not engage.
a. Defective deadman switch. Check deadman switch for
continuity. If none found when
the control arm is in the brake
position, replace switch.
b. Defective electric brake. Replace brake.
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