JLG 4017 Service Manual - Manual (Page 51)

3.27 4017
Boom
9. Rapid boom pad wear. 1. Incorrect wear pad gap.
2. Rapid cycle times with heavy
loads.
3. Contaminated, corroded or
rusted wear pad sliding
surfaces.
4. Operating in extremely dusty/
abrasive conditions.
1. Check wear pad gaps and
correct as needed. Refer to
Section 3.7.2, “Boom Wear Pad
Replacement.”
2. Reduce cycle times.
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. Clean equipment frequently.
10. Auxiliary hydraulics will not
operate.
1. Auxiliary hydraulic system not
operating properly.
1. Refer to Section 8.4, “Hydraulic
Circuits.”
11. Excessive chain wear. 1. Improper chain adjustment.
2. Chain sheave(s) not properly
lubricated.
3. Chain sheave(s) not rotating
freely.
4. Improper chain lubrication.
1. Adjust to correct tension. Refer
to Section 3.4.1, “Boom Chain
Inspection.”- Replace chains as
needed.
2. Lubricate chain sheave. (Refer
to Section 2.5, “Service and
Maintenance Schedules.”
3. Lubricate chain sheave. Refer
to Section 2.5, “Service and
Maintenance Schedules.”
Repair or replace chain
sheave(s) as needed.
4. Lubricate at regular intervals.
(Refer to Section 2.5, “Service
and Maintenance Schedules.”
Replace chains as needed.
Boom Troubleshooting (Continued)
Problem Cause Remedy