Troubleshooting - JLG G5-18A Service Manual

Boom
3.7

TROUBLESHOOTING

This section provides an easy reference guide covering
the most common problems that occur during operation
of the boom.
Boom Troubleshooting
Problem
1. Boom will not extend or
retract.
2. Boom will not fully extend.
3. Boom shifts to right or left
when extending.
4. Excessive pivot pin noise
and/or wear.
5. Boom will not raise or lower.
3-16
Cause
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.
1. Extend/retract hydraulic system
not operating properly.
1. Boom side wear pads
improperly shimmed or worn.
1. Insufficient lubrication.
2. Worn bushing(s).
1. Broken hydraulic hoses or tubes
and/or connection leaks.
2. Lift/lower hydraulic system not
operating properly.
3. Faulty Lift cylinders.
4. Seized boom pivot pin bushing.
Remedy
1. Locate break, replace hose(s)
or tube(s), tighten connections.
2. Refer to Section 8, "Hydraulic
System."
3. Repair cylinder (Refer to Section
8.11.4, "Cylinder Inspection.")
1. Refer to Section 8, "Hydraulic
System."
1. Shim wear pads to correct gap.
Replace wear pads as needed.
Refer to Section 3.4.2, "Boom
Wear Pad Replacement."
1. Lubricate at regular intervals.
(Refer to Section 2.5,
"Lubrication Schedule.")
Replace worn pins as needed.
2. Replace bushing(s) and
lubricate at regular intervals
(Refer to Section 2.5,
"Lubrication Schedule.")
1. Locate break, replace hose(s)
or tube(s), tighten connections.
2. Refer to Section 8, "Hydraulic
System."
3. Repair cylinder. (Refer to
Section 8.11.4, "Cylinder
Inspection.")
4. Replace bushing.
G5-18A, 2505