JLG G12-55A Service Manual User Manual
Page 66
Boom
3-32
G10-55A, G12-55A
8. Rapid boom pad wear.
1. Incorrect wear pad gap.
1. Check wear pad gaps and
correct as needed. Refer to
Section 3.11, “Boom Wear
Pads.”
2. Rapid cycle times with heavy
loads.
2. Reduce cycle times.
3. Contaminated, corroded or
rusted wear pad sliding
surfaces.
3. Remove contamination and/or
corrosion from wear pad sliding
surfaces and lubricate. If the
surfaces cannot be
reconditioned, replace the boom
section(s).
4. Operating in extremely dusty/
abrasive conditions.
4. Clean equipment frequently.
9. Auxiliary hydraulics will not
operate.
1. Auxiliary hydraulic system not
operating properly.
1. Refer to Section 8.4, “Hydraulic
10. Excessive chain wear.
1. Improper chain adjustment.
1. Adjust to correct tension. Refer
to Section 3.7, “Boom Section
Separation Adjustment.”-
Replace chains as needed.
2. Chain sheave(s) not properly
lubricated.
2. Lubricate chain sheave. (Refer
to Section 2.5, “Service and
Maintenance Schedules.”
3. Chain sheave(s) not rotating
freely.
3. Lubricate chain sheave. Refer
to Section 2.5, “Service and
Maintenance Schedules.”
Repair or replace chain
sheave(s) as needed.
4. Improper chain lubrication.
4. Lubricate at regular intervals.
Refer to Section 2.5, “Service
and Maintenance Schedules.”
Replace chains as needed.
Problem
Cause
Remedy