JLG 266 LoPro Service Manual - Manual (Page 31)

3.9 266, 307, 266 LoPro
Boom
3.6 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.
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.”)
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 3.4.2, “Boom
Wear Pad Replacement.”
4. Excessive pivot pin noise
and/or wear.
1. Insufficient lubrication.
2. Worn bushing(s).
1. Lubricate at regular intervals.
(Refer to Section 2.6,
“Lubrication Schedules.”)
Replace worn pins as needed.
2. Replace bushing(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.
2. Lift/lower hydraulic system not
operating properly.
3. Faulty Lift cylinders.
4. Seized boom pivot pin bushing.
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.