JLG 330CRT Service Maintenance Manual page 47

TROUBLE
No response to steer control switch on controller
Machine hard to steer or steering is erratic
3121804
Table 3-2. Chassis Troubleshooting
PROBABLE CAUSE
Loose or damaged wiring between drive
controller and High Speed switch.
Defective high speed control switch.
Loose or damaged wiring in control box
wire harness.
Loose or damaged wiring between plat-
form and high speed solenoid.
High speed solenoid not functioning
properly.
Loose or damaged wiring between high
speed relay and high speed limit switch.
High speed limit switch not functioning
properly.
Loose or damaged wiring in valve wiring
harness.
Steering System
Steer switch on controller not functioning
properly.
Hydraulic system oil low.
Hydraulic system pressure too low.
Loose or damaged wiring on control
switch or solenoid valve.
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 or broken hydraulic line or fit-
ting.
– JLG Lift –
SECTION 3 - TROUBLESHOOTING
REMEDY
Ensure proper connection of wires. Using
suitable test meter, perform continuity test
on wiring between switches. Repair or
replace wires as necessary.
Replace high speed control switch.
Ensure proper connection of wires at the
control switch. Using suitable test meter,
perform continuity test on wires. Repair or
replace harness as necessary.
Ensure proper connection of wires at the
platform and at the high speed solenoid.
Using suitable test meter, perform conti-
nuity test on wires. Repair or replace
wires as necessary.
Replace solenoid.
Ensure proper connection of wires
between high speed relay and high speed
limit switch. Using suitable test meter, per-
form continuity test on wires. Repair or
replace wires as necessary.
Repair or replace limit switch.
Ensure proper connection of wires at ter-
minal strip. Using suitable test meter, per-
form continuity test on wires. Repair or
replace wires as necessary.
Repair or replace switch.
Replenish oil as necessary.
Adjust pressure.
Ensure proper connection of wires at con-
trol switch or solenoid valve. Using suit-
able test meter, perform continuity test on
wires. Repair or replace wires as neces-
sary.
Clean, repair or replace line.
Repair or replace valve.
Repair or replace cylinder.
Replenish oil as necessary.
Clean, repair or replace line or fitting.
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