SECTION 3 - TROUBLESHOOTING
3120826
– JLG Sizzor –
3-9
Table 3-5. Electrical System Troubleshooting
TROUBLE
PROBABLE CAUSE
REMEDY
HAND CONTROLLER
Regardless of which way handle is moved, only
one function occurs
Improper or loose wiring to the solenoid(s)
Check all wiring for proper connections
Directional valve stuck in one direction
Repair or replace valve
Valve will not function when handle is moved in
either direction
Enable switch not activated
Activate enable switch
Function not activated within the 3 seconds after
enable switch was depressed
Reactivate enable switch
Enable switch not functioning properly
Replace enable switch circuit card
No electrical power to handle
Check electrical input to hand controller (12V)
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
Defective controller
Repair or replace controller
Microswitches on controller bad or need adjust-
ment
Adjust or replace switches
CONTROL SWITCHES
No response to a function control switch
Emergency stop switch not positioned properly
Place emergency stop switch to on
Platform/Ground select switch not positioned
properly
Place switch to platform or ground, as necessary
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 start relay from emergency
stop switch
Check battery cable from switch to 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
connection or damage. Repair or replace cable as
necessary
No voltage present at circuit breaker
Check wire from terminal strip to battery for proper
connection or damage. Repair or replace cable as
necessary
Defective circuit breaker
Replace circuit breaker
No voltage present at Platform/Ground select
switch
Unplug ground control box harness from platform
receptacle. check wire from applicable pin in plug
to control box power switch for proper connection.
Using suitable test meter, perform continuity test
on wire. Repair or replace harness as necessary
Summary of Contents for 25RTS
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