JLG G12-55A Service Manual - Manual (Page 103)

6-11 G10-55A, G12-55A
Transmission
6. Grinding or
“clunking”
noise from
transmission.
1. Oil level too low. 1. Fill oil to correct level. Refer to Section
Note:, “Friction Modifier required for axle
differentials, see Section 2.5.3,
“Capacities.”.”
2. Repair or replace parts as needed.
2. Transmission filled with incorrect oil. 3. Drain transmission 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. Incorrect clutch engagement. 4. Refer to Section 9.9.2, “Transmission
Solenoid Valves.”
4. Internal damage. 5. Repair or replace parts as needed.
5. Broken diaphragm (torque convertor). 6. Replace diaphragm (torque convertor).
Refer to Section 6.4.1, “Transmission
Removal.”
6. Loose diaphragm (torque convertor)
mounting capscrews.
7. Tighten capscrews.
Problem Cause Remedy