5 troubleshooting, 1 transmission troubleshooting, Troubleshooting – Lull 944E-42 Service Manual User Manual

Page 93: Transmission troubleshooting

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6-7

944E-42

Transmission

6.5

TROUBLESHOOTING

This section provides an easy reference guide covering
the most common problems that may occur during
operation of the transmission.

Note: Contact your local authorized 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.

6.5.1

Transmission Troubleshooting

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, “Fluid and
Lubricant Capacities.”
)

2. Travel select lever not

functioning properly and/or a
fault in the wiring harness.

2. Refer to Section 9.5, “Electrical

Schematics.”

3. Transmission valve body

solenoids not functioning
properly.

3. Refer to Section 9.5, “Electrical

Schematics.”

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 6.5.1,

“Transmission 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.

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