JLG 25RTS Service & Maintenance page 73

TROUBLE
Regardless of which way handle is moved, only
one function occurs
Valve will not function when handle is moved in
either direction
No response to a function control switch
3120826
Table 3-5. Electrical System Troubleshooting
PROBABLE CAUSE
HAND CONTROLLER
Improper or loose wiring to the solenoid(s)
Directional valve stuck in one direction
Enable switch not activated
Function not activated within the 3 seconds after
enable switch was depressed
Enable switch not functioning properly
No electrical power to handle
No electrical power to valve
Improper ground
Defective controller
Microswitches on controller bad or need adjust-
ment
CONTROL SWITCHES
Emergency stop switch not positioned properly
Platform/Ground select switch not positioned
properly
Circuit breaker open
No voltage present at emergency stop switch
Emergency stop switch not functioning properly
No voltage supplied to 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 Platform/Ground select
switch
– JLG Sizzor –
SECTION 3 - TROUBLESHOOTING
REMEDY
Check all wiring for proper connections
Repair or replace valve
Activate enable switch
Reactivate enable switch
Replace enable switch circuit card
Check electrical input to hand controller (12V)
Check electrical output of printed circuit board and
electrical signal at the valve
Check for proper grounding of handle
Repair or replace controller
Adjust or replace switches
Place emergency stop switch to on
Place switch to platform or ground, as necessary
Determine and correct cause. Reset circuit
breaker
Check battery cable from battery to emergency
stop switch for proper connection or damage.
Repair or replace cable as necessary
Replace switch
Check battery cable from switch to relay for proper
connection or damage. Repair or replace cable as
necessary
Check wire from battery to terminal strip for proper
connection or damage. Repair or replace cable as
necessary
Check wire from terminal strip to battery for proper
connection or damage. Repair or replace cable as
necessary
Replace circuit breaker
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
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