Lull 6K Service Manual - Manual (Page 297)

Boom and Transfer
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 6-47
Troubleshooting
Problem Probable Cause Solution Reference
1. Boom fails to
extend or retract
A. Broken hydraulic line(s)
and/or connection leaks
B. Faulty extension cylinder
C. Broken chains or chain
connections
A. Replace hydraulic
tube(s)/hose(s) and/or
tighten loose connections.
B. Repair extension cylinder
seals.
C. Repair or replace chains.
2. Boom fails to raise
or lower
A. Broken hydraulic line(s)
and/or connection leaks
B. Faulty hoist cylinder(s)
C. Faulty components in
raise/lower hydraulic
circuitry
A. Replace hydraulic
hose(s)/tube(s) and/or
tighten loose connections.
B. Repair cylinder seals.
C. Repair or replace damaged
components.
3. Excessive boom
pivot pin or cylinder
pivot pin wear
A. Failure to grease at regular
intervals
B. Worn bushings
A. Replace worn pins and
lubricate at recommended
intervals.
B. Replace bushings and
lubricate at recommended
intervals.
4. Excessive Slide
Pad Wear
A. Improper shimming of slide
pads
B. Contaminated or rusted
slide pad sliding surfaces
after long term storage
A. Make proper shim
adjustments.
B. Clean and lubricate slide
pad sliding surfaces.
See page 6-52, and
page 6-61 (2-section),
page 6-91 (3-section), or
page 6-147 (4-section).
See page 6-50.
5. Jerky boom extend
or retract functions
A. Chains out of adjustment A. Readjust chains.
6. Excessive Chain
Wear
A. Chains out of adjustment
B. Improper chain lubrication
A. Replace and readjust
chains.
B. Replace chain(s) and
lubricate at recommended
intervals.