JLG G12-55A Service Manual - Manual (Page 70)

Boom
3-34 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 3.9, “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
Circuits.”
10. Excessive chain wear. 1. Improper chain adjustment. 1. Adjust to correct tension. Refer
to Section 3.6, “Boom Section
Separation Adjustment.”-
Replace chains as needed.
2. Chain sheave(s) not
properly lubricated.
2. Lubricate chain sheave. (Refer
to Section 2.6, “Service and
Maintenance Schedules.”
3. Chain sheave(s) not
rotating freely.
3. Lubricate chain sheave. Refer
to Section 2.6, “Service and
Maintenance Schedules.”
Repair or replace chain
sheave(s) as needed.
4. Improper chain lubrication. 4. Lubricate at regular intervals.
Refer to Section 2.6, “Service
and Maintenance Schedules.”
Replace chains as needed.
Problem Cause Remedy