Transmission Troubleshooting - JLG Lull 1044C-54 II Series Service Manual

Transmission

Transmission Troubleshooting

Problem
1. Transmission will not engage
or will not shift properly.
2. Low or no pump flow or
pressure.
8-16
Note:Contact the JLG Service Department at 1-877-554-5438 or
1-717-485-6657, if internal transmission repair is required during the
warranty period.
Detailed transmission service instructions (covering repair, disassembly, reassembly
and adjustment information) are provided in the ZF 4 WG-98 TC Transmission
Repair Manual, P/N 8990455 (ZF P/N 5871 135 002).
The transmission should be checked, serviced and repaired only by experienced
service technicians who are aware of all safety instructions and particular
component features.
Cause
1. Oil level too high or low.
2. Travel select lever not
functioning properly and/or a
fault in the wiring harness.
3. Transmission valve body
solenoids not functioning
properly.
4. Pilot-operated shift valves not
operating properly.
5. Pump output pressure low.
6. Clutch piston o-rings damaged.
7. Clutch discs worn or damaged.
8. Coupling shafts or gear teeth
damaged.
1. Low oil level.
2. Transmission filled with incorrect
oil, or oil contaminated.
3. Pump suction pipe screen
clogged.
4. Central shaft damaged.
5. Pump worn or damaged.
Remedy
1. Fill transmission to correct level
with Universal Tractor Fluid.
(Refer to the appropriate
owners/operators manual.)
2. Refer to Section 9.14.7, a.
"Travel Select Lever and Wiring
Harness Testing."
3. Refer to Section 9.14.7, b.
"Upper and Lower Transmission
Valve Body Solenoid Testing."
4. Clean the valve spool and
housing. Replace return spring
as needed.
5. Refer to Section , "Transmission
Problem 2.
Troubleshooting,"
"Low or no pump flow or
pressure."
6. Replace o-rings.
7. Replace clutch discs.
8. Replace couplings.
1. Fill transmission to correct level
with Universal Tractor Fluid.
(Refer to the appropriate
owners/operators manual.)
2. Drain transmission and fill to
correct level with Universal
Tractor Fluid. (Refer to the
appropriate owners/operators
manual.)
3. Clean, repair and/or replace
suction pipe.
4. Replace central shaft.
5. Repair or replace pump
assembly.
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