JLG 4017 Service Manual - Manual (Page 49)

3.25 4017
Boom
3.9 TROUBLESHOOTING
This section provides an easy reference guide covering
the most common problems that occur during operation
of the boom.
Boom Troubleshooting
Problem Cause Remedy
1. Boom will not extend or
retract.
1. Broken hydraulic hose(s) or
tube(s) and/or connections
leaking.
2. Extend/Retract hydraulic system
not operating properly.
3. Faulty extend/retract cylinder.
4. Broken chains or anchors.
1. Locate break, replace hose(s)
or tube(s), tighten connections.
2. Refer to Section 8.4, “Hydraulic
Circuits.”
3. Repair cylinder, Refer to Section
8.8.1, “General Cylinder
Removal Instructions.”
4. Replace chains as needed.
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 3.7.2, “Boom
Wear Pad Replacement.”
3. Excessive boom pivot pin
noise and/or wear.
1. Insufficient lubrication.
2. Worn bushing(s).
1. Lubricate at regular intervals.
(Refer to Section 2.5.3, 2.6.
“Lubrication Schedules.”)
2. Replace bushing(s) and
lubricate at regular intervals
4. Excessive compensation
cylinder pivot pin noise and/
or wear.
1. Insufficient lubrication.
2. Worn bushing(s).
1. Lubricate at regular intervals.
(Refer to Section 2.5.3, 2.6.
“Lubrication Schedules.”.)
Replace worn pins as needed.
2. Replace bushing(s) and
lubricate at regular intervals.