JLG 450A Service And Maintenance Manual page 94

SECTION 3 - TROUBLESHOOTING
TROUBLE
Engine surges.
Strong fuel odor.
One or both wheels will not steer.
One or both front wheels will not rotate or
rotate erratically.
Difficulty encountered when moving
machine.
3-10
Table 3-4.Chassis Assembly - Troubleshooting
PROBABLE CAUSE
Engine worn badly.
Engine improperly timed.
Engine overheating.
Dirty fuel filter.
Fuel line pinched.
Throttle governor not working properly.
Governor not adjusted properly.
Fuel tank overfilled.
Fuel tank damaged.
Fuel line from tank damaged.
Carburetor flooding.
FRONT FRAME AXLE AREA.
Steering link or tie rod broken or attaching hard-
ware missing.
Wheel hub or bearings damaged or not lubri-
cated.
REAR FRAME AXLE AREA.
Load capacity exceeded.
Flow divider sticking.
Machine being moved up too steep a grade.
Grade too steep.
Towing valve not closed.
– JLG Lift –
REMEDY
Rebuild engine.
Time engine.
Determine cause of overheating and remedy.
Replace filter.
Replace fuel line.
Repair or replace governor.
Correctly adjust governor.
Check fuel tank and immediately wipe up spilled
fuel.
Drain all fuel from tank and remove tank for
replacement or repair.
Replace fuel line.
Repair, replace or adjust carburetor.
Replace steering link, tie rod or hardware as nec-
essary.
Replace hub or bearings as necessary and
repack bearings with approved grease.
Reduce load. Apply loads only in accordance
with load capacity indicator.
Repair or replace flow divider.
Remove machine from grade and check that
drive system operates correctly.
See WARNING Placard on platform for specified
grades and sideslopes.
Close towing valve.
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