JLG 723A Service Manual - Manual (Page 43)

3-13 L2906H, 2906H, 3507H, 619A, 723A, 29.6LP, 29.6, 35.7
Boom
3.10 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, “Hydraulic
System.”
3. Faulty extend/retract cylinder. 3. Repair cylinder (Refer to Section
8.12.4, “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 3.5.1, “Wear
Pad Inspection.”
4. Excessive pivot pin noise
and/or wear.
1. Insufficient lubrication. 1. Lubricate at regular intervals.
(Refer to Section 2.6,
“Lubrication Schedule.”)
Replace worn pins as needed.
2. Worn bushing(s). 2. Replace bushing(s) and
lubricate at regular intervals
(Refer to Section 2.6,
“Lubrication Schedule.”)
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 cylinder. 3. Repair cylinder. (Refer to
Section 8.12.4, “Cylinder
Inspection.”)
4. Seized boom pivot pin bushing. 4. Replace bushing.