JLG 4013PS Service Manual - Manual (Page 93)

6-7 3508PS, 3509PS, 3512PS, 3513PS, 4008PS, 4009PS, 4012PS, 4013PS, 4017PS, 40.8, 40.9
Transmission:
6.6 TROUBLESHOOTING
This section provides an easy reference guide covering
the most common problems that may occur during
operation of the transmission.
Note: Contact the JLG Service Department if internal
transmission repair is required during the warranty
period.
The transmission should be checked, serviced and
repaired only by experienced service technicians who are
aware of all safety instructions and particular component
features.
Problem Cause Remedy
1. Transmission will not engage
or will not shift properly.
1. Oil level too high or low. 1. Fill transmission to correct level
with Mobilfluid 424 ® ISO
Grade 46. (Refer to Section 2.4,
“Fluids, Lubricants and
Capacities.”)
2. Transmission control lever not
functioning properly and/or a
fault in the wiring
harness.Transmission control
lever not functioning properly
and/or a fault in the wiring
harness.
2. Refer to Section 9.7.1, “Cab
Harness Electrical Schematic.”
3. Transmission valve body
solenoids not functioning
properly.
3. Refer to Section 9.7.1, “Cab
Harness Electrical Schematic.”
4. Pilot-operated shift valves not
operating properly.
4. Clean the valve spool and
housing. Replace return spring
as needed.
5. Pump output pressure low. 5. Refer to Section 6.6,
“Troubleshooting,” Problem 2.
“Low or no pump flow or
pressure.”
6. Clutch piston o-rings damaged. 6. Replace o-rings.
7. Clutch discs worn or damaged. 7. Replace clutch discs.
8. Coupling shafts or gear teeth
damaged.
8. Replace couplings.