JLG 4017PS Service Manual - Manual (Page 81)

3-43 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
Boom
3.22 TROUBLESHOOTING
This section provides an easy reference guide covering
the most common problems that occur during operation
of the boom.
Problem Possible Causes Remedy
1. Boom will not extend or
retract
1. Broken hydraulic hose(s) or
tube(s) and/or connections
leaking.
1. Locate break, replace hose(s)
or tube(s), tighten connections.
2. Extend/retract hydraulic system
not operating properly.
2. Refer to Section 8.5, “Hydraulic
Circuits.”
3. Faulty extend/retract cylinder. 3. Repair cylinder. Refer to Section
8.11.1, “General Cylinder
Removal Instructions.”
2. Boom shifts to right or left
when extending.
1. Boom side wear pads
improperly shimmed or worn.
1. Shim wear pads to correct gap.
Replace wear pads as needed.
Refer to Section 3.17, “Boom
Wear Pads.”
3. Excessive pivot pin noise
and/or wear.
1. Insufficient lubrication. 1. Lubricate at regular intervals.
Refer to Section 2.7,
“Lubrication Schedule.” Replace
worn pins as needed.
2. Worn bearing(s). 2. Replace bearing(s) and
lubricate at regular intervals
Refer to Section 2.7,
“Lubrication Schedule.”
4. Excessive Compensation
cylinder pivot pin noise and/
or wear.
1. Insufficient lubrication. 1. Lubricate at regular intervals.
Refer to Section 2.7,
“Lubrication Schedule.” Replace
worn pins as needed.
2. Worn bushing(s). 2. Replace bushing(s) and
lubricate at regular intervals.
5. Boom will not raise or lower. 1. Broken hydraulic hoses or tubes
and/or connection leaks.
1. Locate break, replace hose(s)
or tube(s), tighten connections.
2. Lift/lower hydraulic system not
operating properly.
2. Refer to Section 8.5, “Hydraulic
Circuits.”
3. Faulty lift/lower cylinder. 3. Repair cylinder. Refer to Section
8.11.1, “General Cylinder
Removal Instructions.”
4. Seized boom pivot pin bushing. 4. Replace bushing.