Big Joe PTE 30 Series, Operation, Maintenance, Repair Parts List

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901467 4-1
SECTION 4
TROUBLESHOOTING
4-1. GENERAL
Table 4-1 services as a guide to determine possible
causes of trouble. The table is divided into five main
categories: Truck Dead: Trouble With Travel: Trouble
With Braking: Trouble With Lifting Or Lowering, and
Miscellaneous malfunctions. Refer to electrical wiring
schematic (
Figure 4-5 ) as a supplement to the trouble-
shooting chart or when tracing an electrical circuit.
Table 4-1 Troubleshooting Chart
MALFUNCTION PROBABLE CAUSE CORRECTIVE ACTION
TRUCK DEAD
Truck will not run nor will lift sys-
tem operate.
a. Fuse (2, Figure 4-2 ) blown. Check fuse and replace if neces-
sary.
b. Battery dead or disconnected. Check battery quick-disconnect
switch (8, Figure 12-9 ) and
check battery voltage.
c. Keyswitch (4, Figure 12-7 ) or
emergency disconnect switch (6)
defective.
Bypass keyswitch to determine if it
is malfunctioning. Then bypass
emergency disconnect switch to
determine if it is malfunctioning.
d. Defective wiring. Check for open circuit. Repair as
required.
TROUBLE WITH TRAVEL
Truck does not run forward or
reverse. All other functions oper-
ate 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 (19,
Figure 12-1 ).
Check and replace switch if defec-
tive.
c. Defective main contactor (5,
Figure 4-2 ).
Check for proper operation and
replace if necessary.
d. Defective potentiometer (14,
Figure 12-4 ).
Check and replace potentiometer
if defective.
e. Transistor control fault may
need to be reset.
Move control arm up into the neu-
tral position to reset.
Truck runs forward but not in
reverse.
Defective reverse switch (6, Fig-
ure 12-4 ) in control head.
Check for proper operation of
reverse switch with steering arm
in operating position and replace
if necessary.
Truck runs reverse but not in for-
ward.
Defective forward switch (6, Fig-
ure 12-4 ) in control head.
Check for proper operation of
reverse switch with steering arm
in operating position and replace
if necessary.