JLG G12-55A Service Manual - Manual (Page 87)

5-7 G10-55A, G12-55A
Axles, Drive Shafts, Wheels and Tires
7. Axle overheating. 1. Oil level too high. 1. Fill oil to correct level with hydraulic oil.
Refer to Section Note:, “Friction Modifier
required for axle differentials, see
Section 2.5.3, “Capacities.”.”
2. Axle and/or wheel end housings
filled with incorrect oil or oil
contaminated or oil level low.
2. Drain axle and fill to correct level with
hydraulic oil. Refer to Section Note:,
“Friction Modifier required for axle
differentials, see Section 2.5.3,
“Capacities.”.”
3. Dragging park brake. 3. Adjust park brake cable as needed.
8. High steering
effort required.
1. Steering (hydraulic) system not
operating properly.
1. Refer to Section 8.4, “Hydraulic
Circuits.”
2. Excessive joint housing swivel
bearing preload.
2. Correct bearing preload by adding or
removing shims as needed.
3. Worn or damaged swivel bearings. 3. Replace swivel bearings as needed.
9. Slow steering
response.
1. Steering (hydraulic) system not
operating properly.
1. Refer to Section 8.4, “Hydraulic
Circuits.”
2. Steering cylinder leaking internally. 2. Repair or replace steering cylinder
as needed.
10. Excessive noise
when brakes
are engaged.
1. Brake discs worn. 1. Check brake discs for wear. Refer to
Section 5.7, “Brakes.”
2. Brake discs damaged. 2. Replace brake discs.
11. Brakes will
not engage.
1. Brake (hydraulic) system not
operating properly.
1. Refer to Section 8.4, “Hydraulic
Circuits.”
2. Brake piston o-rings and seals
damaged (leaking).
2. Replace o-rings and seals.
12. Brakes will not
hold the machine
or braking
power reduced.
1. Brake discs worn. 1. Check brake discs for wear. Refer to
Section Note:, “Friction Modifier
required for axle differentials, see
Section 2.5.3, “Capacities.”.”
2. Brake (hydraulic) system not
operating properly.
2. Refer to Section 8.4, “Hydraulic
Circuits.”
3. Brake piston o-rings and seals
damaged (leaking).
3. Replace o-rings and seals.
Problem Cause Remedy