JLG 260MRT - Electrical System Troubleshooting

SECTION 3 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS
3-20 3121801
Table 3-4. Electrical System Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY
Hand Controller
Va lv e wi ll not fu nc ti on w he n ha nd le i s m ove d in ei the r d ire ct io n.
Enable switch not activated. Activate enable switch.
Controller not activated within three seconds after enable
switch is activated.
Activate enable switch, then activate controller within three
seconds.
Enable circuit not functioning properly. Replace enable circuit card.
No electrical power to handle. Check electrical input to hand controller (12 Volts).
No electrical power to valve. Check electrical output of printed circuit board and electrical
signal at the valve.
Improper ground. Check for proper grounding of handle.
Control Switches
No response to a function control switch
Enable switch not activated. Activate enable switch.
Control switch not activated within three seconds after
enable switch is activated.
Activate enable switch, then activate control switch within
three seconds.
Enable circuit not functioning properly. Replace enable circuit card.
Applicable emergency stop switch not positioned properly. Place applicable emergency stop switch to on
Power selector switch on ground control box not positioned
properly.
Place power selector switch to platform or ground, as
required.
Circuit breaker open. Determine and correct cause. Reset circuit breaker.
No voltage present at emergency stop switch. Check battery cable from battery to emergency stop switch
for proper connection or damage. Repair or replace cable as
necessary.
EMERGENCY STOP switch not functioning properly. Replace switch.
No voltage supplied to engine start relay from emergency
stop switch.
Check battery cable from emergency stop switch to start
relay for proper connection or damage. Repair or replace
cable as necessary.
No voltage input at terminal strip. Check wire from battery to terminal strip for proper connec-
tion or damage. Repair or replace wire as necessary.
No voltage present at circuit breaker. Check wire from terminal strip to circuit breaker for proper
connection or damage. Repair or replace wire as necessary.
Defective circuit breaker. Replace circuit breaker.
No voltage present at function control switch. Check wiring from emergency stop switch to function con-
trol switch for proper connection or damage. Repair or
replace wiring as necessary.
Defective function control switch. Replace function control switch.
No response to a function control switch (cont.)