Lull 944E-42 Service Manual - Manual (Page 192)

Transmission: ZF 4WG-92/98 TSC & Transfer Case: ZF TB92-I4
6.16 Model 644E-42/944E-42 Rev. 6/04
3. Low clutch pressure. 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. 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.
4. Lack of power. 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. Refer to Section 8.8.7, “Park
Brake Circuit &
Troubleshooting,” and Section
8.8.8, “Service Brake Circuit &
Troubleshooting.”
2. Adjust the engine rpm to
specifications (refer to Cummins
4BT3.9 Service Manual).
3. Refer to Section 6.8.1,
“Transmission Troubleshooting,”
Problem 2. “Low or no pump
flow or pressure.”
4. Replace clutch discs.
5. Refer to Section 6.8.1,
“Transmission Troubleshooting,”
Problem 5. “Transmission
overheating (oil above 248° F
[120° C]).”
6.8.1 Transmission Troubleshooting (Continued)
Problem Cause Remedy