JLG 260MRT Service Manual - Manual (Page 86)

SECTION 3 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS
3-20 – JLG Lift – 3121801
Table 3-4. Electrical System Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY
Hand Controller
Valve will not function when handle is moved in either direction.
Enable switch not activated. Activate enable switch.
Controller not activated within three sec-
onds after enable switch is activated. Activate enable switch, then activate con-
troller 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 con-
trol 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 cir-
cuit breaker.
No voltage present at emergency stop
switch. Check battery cable from battery to
emergency stop switch for proper con-
nection or damage. Repair or replace
cable as necessary.
EMERGENCY STOP switch not function-
ing 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 con-
nection or damage. Repair or replace
cable as necessary.
No voltage input at terminal strip. Check wire from battery to terminal strip
for proper connection 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 dam-
age. 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 control switch for
proper connection or damage. Repair or
replace wiring as necessary.
Defective function control switch. Replace function control switch.