JLG 4017RS Service Manual - Manual (Page 82)

Boom
3-42 3614RS, 4017RS
3.21 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
8.10.1, “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 3.16, “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
8.10.1, “General Cylinder Removal
Instructions.”
4. Seized boom pivot pin bushing. 4. Replace bushing.