JLG 4013PS Service Manual - Manual (Page 60)

Boom
3-28 3508PS, 3509PS, 3512PS, 3513PS, 4008PS, 4009PS, 4012PS, 4013PS, 4017PS, 40.8, 40.9
3.13 TROUBLESHOOTING
This section provides an easy reference guide covering
the most common problems that occur during operation
of the boom.
Problem Cause 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, “Hydraulic
System.”
3. Faulty extend/retract cylinder. 3. Repair cylinder. Refer to Section
8.10.4, “Cylinder Inspection.”
2. Boom will not fully extend. 1. Extend/retract hydraulic system
not operating properly.
1. Refer to Section 8, “Hydraulic
System.”
3. 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 3.10.2, “Wear
Pad Installation and
Lubrication.”
4. Excessive pivot pin noise
and/or wear.
1. Insufficient lubrication. 1. Lubricate at regular intervals.
Refer to Section 2.6,
“Lubrication Schedules.”
Replace worn pins as needed.
2. Worn bearing(s). 2. Replace bearing(s) and
lubricate at regular intervals
Refer to Section 2.6,
“Lubrication Schedules.”
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, “Hydraulic
System.”
3. Faulty lift/lower cylinder. 3. Repair cylinder. Refer to Section
8.10.4, “Cylinder Inspection.”
4. Seized boom pivot pin bearing. 4. Replace bearing.