Troubleshooting - JLG Lull 1044C-54 II Series Service Manual

Troubleshooting

Problem
1. Boom fails to
extend or retract
2. Boom fails to raise
or lower
3. Excessive boom
pivot pin or cylinder
pivot pin wear
4. Excessive Slide
Pad Wear
5. Jerky boom extend
or retract functions
6. Excessive Chain
Wear
31200079
Probable Cause
A. Broken hydraulic line(s)
and/or connection leaks
B. Faulty extension cylinder
C. Broken chains or chain
connections
A. Broken hydraulic line(s)
and/or connection leaks
B. Faulty hoist cylinder(s)
C. Faulty components in
raise/lower hydraulic
circuitry
A. Failure to grease at regular
intervals
B. Worn bushings
A. Improper shimming of slide
pads
B. Contaminated or rusted
slide pad sliding surfaces
after long term storage
A. Chains out of adjustment
A. Chains out of adjustment
B. Improper chain lubrication
Solution
A. Replace hydraulic
tube(s)/hose(s) and/or
tighten loose connections.
B. Repair extension cylinder
seals.
C. Repair or replace chains.
D. Check pump pressure
A. Replace hydraulic
hose(s)/tube(s) and/or
tighten loose connections.
B. Repair cylinder seals.
C. Repair or replace damaged
components.
D. Check pump pressure
A. Replace worn pins and
lubricate at recommended
intervals.
B. Replace bushings and
lubricate at recommended
intervals.
A. Make proper shim
adjustments.
B. Clean and lubricate slide
pad sliding surfaces.
A. Readjust chains.
A. Replace and readjust
chains.
B. Replace chain(s) and
lubricate at recommended
intervals.
Boom and Transfer
Reference
See page 6-38, and
page 6-48 (4-section).
See page 6-36.
6-33