JLG 26MRT Service & Maintenance page 52

SECTION 3 - TROUBLESHOOTING
TROUBLE
Valve will not function when handle is moved in either direction.
No response to a function control switch
3-8
Table 3-4. Electrical System Troubleshooting
PROBABLE CAUSE
Hand Controller
Enable switch not activated.
Controller not activated within three sec-
onds after enable switch is activated.
Enable circuit not functioning properly.
No electrical power to handle.
No electrical power to valve.
Improper ground.
Control Switches
Enable switch not activated.
Control switch not activated within three
seconds after enable switch is activated.
Enable circuit not functioning properly.
Applicable emergency stop switch not
positioned properly.
Power selector switch on ground control
box not positioned properly. .
Circuit breaker open.
No voltage present at emergency stop
switch.
EMERGENCY STOP switch not function-
ing properly.
No voltage supplied to engine start relay
from emergency stop switch.
No voltage input at terminal strip.
No voltage present at circuit breaker.
Defective circuit breaker.
No voltage present at function control
switch..
Defective function control switch.
– JLG Sizzor –
REMEDY
Activate enable switch.
Activate enable switch, then activate con-
troller within three seconds.
Replace enable circuit card.
Check electrical input to hand controller
(12 Volts).
Check electrical output of printed circuit
board and electrical signal at the valve.
Check for proper grounding of handle.
Activate enable switch.
Activate enable switch, then activate con-
trol switch within three seconds.
Replace enable circuit card.
Place applicable emergency stop switch
to on
Place power selector switch to platform
or ground, as required.
Determine and correct cause. Reset cir-
cuit breaker.
Check battery cable from battery to
emergency stop switch for proper con-
nection or damage. Repair or replace
cable as necessary.
Replace switch.
Check battery cable from emergency
stop switch to start relay for proper con-
nection or damage. Repair or replace
cable as necessary.
Check wire from battery to terminal strip
for proper connection or damage. Repair
or replace wire as necessary.
Check wire from terminal strip to circuit
breaker for proper connection or dam-
age. Repair or replace wire as necessary.
Replace circuit breaker.
Check wiring from emergency stop
switch to function control switch for
proper connection or damage. Repair or
replace wiring as necessary.
Replace function control switch.
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