SECTION 3
TROUBLESHOOTING
3-1. GENERAL
Use Table 3-1 as a guide to determine possible
causes of trouble. The table is divided into five main
categories: Vehicle and Hydraulic System Will Not
Operate: Vehicle Does Not Operate Forward or
Reverse: Trouble With Braking: Trouble With Lifting Or
Lowering, and Miscellaneous malfunctions.
Table 3-1 Troubleshooting Chart
MALFUNCTION PROBABLE CAUSE CORRECTIVE ACTION
TRAVEL AND HYDRAULIC
SYSTEM WILL NOT OPERATE
Check the battery connections
and connect if necessary.
Turn keyswitch “ON” or bypass
keyswitch to determine if it is
malfunctioning.
Close access gates.
Disengage the emergency power
disconnect switch or bypass
s
witch to determine if it is
malfunctioning.
Press "deadman" footswitch or
bypass pedal to determine if it is
malfunctioning.
a. Battery connections not
connected.
b. Keyswitch “OFF” or defective.
c. Safety
access gate open.
d. Emergency power disconnect
switch pressed or defective.
e. “Deadman” footswitch not
pressed or defective.
f. Battery charge too low.
g. Faulty fuse.
Check battery charge, charge
bat
tery if necessary.
Test fuses.
VEHICLE DOES NOT OPERATE
FORWARD OR REVERSE
• Vehicle does not travel forward
or reverse. All other functions
operate normally.
a. Check all wiring. A loose
connection may be the
cause of malfunction.
Tighten all loose connections
before further troubleshooting.
c. Defective controller.
d. Defective travel switch.
• Vehicle travels forward but not in
reverse.
Defective travel switch.
• Vehicle travels reverse but not in
forward.
Defective travel switch in control
head.
• Vehicle travels forward and in
reverse at lower speeds; will not
travel at high speed.
a. Defective travel switch in
control head.
b. Operator platform raised above
20 inches.
Check for proper operation and
replac
e if necessary.
Check and
replace switch if
defective.
Check and replace switch if
defective.
Check and replace switch if
defective.
Check and replace switch if
defective.
Lower operator platform below 20
inches
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