JLG 25RTS Service & Maintenance page 69

TROUBLE
No response to control
Machine hard to steer or steering is erratic
Steering inoperative
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Table 3-2. Chassis Troubleshooting
PROBABLE CAUSE
Loose or damaged wire between platform and
high speed solenoid
High speed solenoid not functioning properly
Loose or damaged wires between high sped relay
and high speed limit switch
High speed limit switch not functioning properly
Loose or damaged wire in valve wiring harness
STEERING SYSTEM
Enable switch not activated
Function not activated within the 3 seconds after
enable switch was depressed
Enable switch not functioning properly
Hydraulic system oil low
Damaged wiring on control switch or solenoid
valve
Controller not functioning properly
Restricted or broken hydraulic line on valve bank
or hydraulic pump
Control valve not functioning properly
Steer cylinder not functioning properly
Hydraulic system oil low
Restricted hydraulic line or fitting
Lack of lubrication
Restricted crossover relief valve (pressure low)
Steer system pressure low
Bent steering linkage
Hydraulic pump not functioning properly
Steer cylinder not functioning properly
Tire pressure low
Bent or seized spindle
Damaged wiring on controller or solenoid valve
Solenoid valve not functioning properly
Controller not functioning properly
Relief valve improperly set or not functioning prop-
erly
Steer cylinder not functioning properly
– JLG Sizzor –
SECTION 3 - TROUBLESHOOTING
REMEDY
Ensure proper connection of wire at the platform
and at the high speed solenoid. Using suitable test
meter, perform continuity test on wire. repair or
replace harness as necessary.
Replace e solenoid
Ensure proper connection of wires between high
speed relay and high speed limit switch. Using
suitable test meter, perform continuity test on wire.
repair or replace harness as necessary.
Repair or replace limit switch
Ensure proper connection of wires at the terminal
strip. Using suitable test meter, perform continuity
test on wire. repair or replace harness as neces-
sary.
Activate enable switch
Reactivate enable switch
Replace enable switch circuit card
Replenish oil as necessary
See proper wiring diagram
Replace controller
Clean repair or replace line
Repair or replace valve
Repair or replace steer cylinder
Replenish oil as necessary
Clean, repair or replace line or fitting
Lubricate as required (refer to lubrication chart)
Clean or replace valve
Adjust pressure
Repair or replace linkage as required
Repair or replace pump
Repair or replace cylinder
Correct tire pressure
Replace spindle
See proper wiring diagram
Repair or replace valve
Replace controller
Reset, repair or replace valves as required
Repair or replace steer cylinder
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