Big Joe E30 - SECTION 4 TROUBLESHOOTING; 4-1. Troubleshooting General Information

BL-E30-0515 - 03-01-2018 4-1
SECTION 4
TROUBLESHOOTING
4-1. GENERAL
Use Table 4-1 and Figure 4-3 as a guide to determine
possible causes of trouble. The table is divided into
five main categories: Truck and Hydraulic System Will
Not Operate: Truck Does Not Operate Forward or
Reverse: Trouble With Braking: Trouble With Lifting Or
Lowering, 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 (12, Figure 12-18) blown. Check fuse and replace if
necessary.
b. Battery dead or disconnected. Check battery connections and
check battery voltage.
c. Keyswitch (20, Figure 12-18)
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 (16,
Figure 12-1).
Check and replace switch if
defective.
c. Defective controller (2, Figure
12-18).
Check for proper operation and
replace if necessary.
d. Defective potentiometer (21,
Figure 12-2).
Check and replace potentiometer
if defective.
Truck travels forward but not in
reverse.
Defective potentiometer (21, Fig-
ure 12-2) in control head.
Check and replace potentiometer
if defective.
Truck travels reverse but not in
forward.
Defective potentiometer (21, Fig-
ure 12-2) 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 (21, Fig-
ure 12-2) 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 (16,
Figure 12-1).
Check deadman switch for
continuity. If none found when
the control arm is in the brake
position, replace switch.
b. Defective electric brake (35,
Figure 12-5).
Replace brake.
Brake will not release. a. Brake temperature above
281F (140 C).
Allow to cool.
b. Op
en brake circuitry or wiring. Make voltage checks.