JLG Lull 1044C-54 II Series Service Manual page 341

Transmission Troubleshooting (Continued)
Problem
3. Low clutch pressure.
4. Lack of power.
5. Transmission overheating
(oil above 248° F [120° C]).
31200079
Cause
1. Incorrect oil level.
2. Main pressure valve stuck open.
3. Broken or worn coupling shaft or
piston o-rings.
4. Pressure reducing valve stuck
open.
1. Park or service brake dragging.
2. Low engine rpm causes
converter stall.
3. Pump output pressure is low.
4. Clutch discs worn or damaged.
5. Transmission overheating.
1. Low oil level.
2. Clogged radiator.
3. Transmission filled with incorrect
oil, or oil contaminated.
4. Excessive "roading."
5. Restriction in oil cooler hoses.
6. Pump worn or damaged.
7. Engine thermostat stuck.
Transmission
Remedy
1. Fill transmission to correct level
with Universal Tractor Fluid.
Refer to the appropriate
owners/operators manual.
2. Clean the valve spool and
housing.
3. Replace coupling and/or o-rings.
4. Clean the valve spool and
housing.
1. Refer to Section 8.8, "Hydraulic
Circuits and Troubleshooting."
2. Adjust the engine rpm to
specifications. Refer to
Cummins Service Manual.
3. Refer to Section , "Transmission
Problem 2.
Troubleshooting,"
"Low or no pump flow or
pressure."
4. Replace clutch discs.
5. Refer to Section , "Transmission
Problem 5.
Troubleshooting,"
"Transmission overheating (oil
above 248° F [120° C])."
1. Fill transmission to correct level
with Universal Tractor Fluid.
Refer to the appropriate
owners/operators manual.
2. Remove debris from the
radiator.
3. Drain transmission and fill to
correct level with Universal
Tractor Fluid. Refer to the
appropriate owners/operators
manual.
4. Stop and idle the engine.
5. Replace cooler hoses.
6. Repair or replace pump
assembly.
7. Replace engine thermostat.
Refer to Section 7B.6.2, b.
"Thermostat Installation."
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