JLG 4017PS Service Manual - Manual (Page 82)

Boom
3-44 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
6. Drooping chain, or jerky
boom extend or retract
functions.
1. Chain(s) tension not properly
adjusted.
1. Adjust chain(s).
2. Chain(s) stretched or binding. 2. Replace chains as needed.
Refer to Section 3.10, “Boom
Sections Adjustment.”
3. Wear pads loose, contaminated,
excessively worn or damaged.
3. Replace wear pad. Refer to
Section 3.17, “Boom Wear
Pads.”
4. Contaminated, corroded or
rusted wear pad sliding
surfaces.
4. Remove contamination and/or
corrosion from wear pad sliding
surfaces and lubricate. If the
surfaces cannot be reconditioned,
replace the boom section(s).
5. Extend/Retract hydraulic
system not operating properly.
5. Refer to Section 8.5, “Hydraulic
Circuits.”
6. Damaged boom section. 6. Replace the damaged boom
section.
7. Excessive Lift/Lower cylinder
pivot pin noise and/or wear.
1. Insufficient lubrication. 1. Lubricate at regular intervals.
Refer to Section 2.6, “Service
and Maintenance Schedules.”
Replace worn pins as needed.
Refer to Section 8.11.1,
“General Cylinder Removal
Instructions.”
2. Worn self-aligning bushing(s). 2. Replace bushing(s) and
lubricate at regular intervals.
Refer to Section 2.7,
“Lubrication Schedule.”
8. Rapid boom pad wear. 1. Incorrect wear pad gap. 1. Check wear pad gaps and
correct as needed. Refer to
Section 3.17, “Boom Wear
Pads.”
2. Rapid cycle times with heavy
loads.
2. Reduce cycle times.
3. Contaminated, corroded or
rusted wear pad sliding
surfaces.
3. Remove contamination and/or
corrosion from wear pad sliding
surfaces and lubricate. If the
surfaces cannot be
reconditioned, replace the boom
section(s).
4. Operating in extremely dusty/
abrasive conditions.
4. Clean equipment frequently.
Problem Possible Causes Remedy