Lull 944E-42 Service Manual - Manual (Page 100)

Boom
3.52 Model 644E-42/944E-42 Rev. 6/04
3. Drooping chain, or jerky
boom extend or retract
functions.
1. Chain(s) tension not properly
adjusted.
2. Chain(s) stretched or binding.
3. Wear pads loose, contaminated,
excessively worn or damaged.
4. Contaminated, corroded or
rusted wear pad sliding
surfaces.
5. Extend/Retract hydraulic and/or
electrical system(s) not
operating properly.
6. Damaged boom section.
1. Adjust chain(s). (Refer to
Section 3.4.4, “Boom Chain
Tension Adjustment.”)
2. Replace chain(s) as needed.
(Refer to Section 3.4.5, “Boom
Extend and Retract Chains
Removal and Replacement.”)
3. Replace wear pads. (Refer to
Section 3.5.1, “Boom Wear Pad
Replacement.”)
4. Remove contamination and/or
corrosion from wear pad sliding
surfaces and lubricate. (Refer to
Section 3.5.2, “Boom Wear Pad
Lubrication.”) If the surfaces
cannot be reconditioned,
replace the boom section(s).
5. Refer to Section 8.7, “Hydraulic
System Testing,” and/or
Section 8, “Hydraulic System”
pages 8.74, 8.76, 8.78, 8.80 or
9.96
6. Replace the damaged boom
section. (Refer to Section 3.3,
“Boom Assembly
Maintenance.”)
Boom Troubleshooting (Continued)
Problem Cause Remedy