Lull 944E-42 Service Manual User Manual

Page 232

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Stabil-TRAK™ System

10-20

944E-42

10.5.9

Hydraulic Troubleshooting - Slow Pivot Mode, Rod Oil Out

MU4261

7

8

6

5

2

10

11

1

9

Legend

1. Stabilizer Cylinder
2. Solenoid 4B
3. .060" Orifice with Solenoid Valve 4B
4. .060" Orifice with Solenoid Valve 4A
5. Solenoid 4A
6. Pressure Reducing Cartridge
7. Solenoid 12A
8. Solenoid 12B
9. Solenoid 3

10. Check Valve 2A
11. Check Valve 2B

4

3

Front

While traveling, ride feels spongy

(riding on 3 wheels).

Conditions:

• Ignition ON, engine

running

• Boom angle is

above 40°

• Travel select lever in

(F) FORWARD or
(R) REVERSE

• Park brake OFF

• Service brake

DISENGAGED

Inspect check valves 2A and 2B on the

stabilizer cylinder. Refer to Section 8.8,

“Hydraulic Cylinders.”

Replace check valve(s).

Check electrical wiring.

Check solenoid coils 4A and 4B on the

Stabil-TRAK™ manifold for correct

resistance (7-9 ohms).

Replace solenoid(s).

Remove solenoid cartridges 4A and 4B

from Stabil-TRAK™ manifold and inspect

for debris or damage. Refer to Section

8.8, “Hydraulic Cylinders.”

Clean passages or replace cartridge(s).

Replace check valve(s).

Inspect check valves on frame sway

cylinder. Refer to Section 8.8, “Hydraulic

Cylinders.”

If OK

If OK

If OK

If OK

Not

OK

Not

OK

Not

OK

Not

OK

Not

OK

Refer to Stabil-TRAK™ Electrical

Circuit Operation and Troubleshooting

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