Lull 944E-42 Service Manual - Manual (Page 793)

10.35 Model 644E-42/944E-42 Rev. 6/04
Stabil-TRAK™ System
10.8.6 Hydraulic Troubleshooting - Free Pivot Mode, Base Oil Out
Front
2
3
4
5
6
8
9
1
7
Legend
1. Stabilizer Cylinder
2. Solenoid 12A
3. Solenoid 12B
4. Pressure Reducing Cartridge
5. Solenoid 4A
6. Solenoid 4B
7. Solenoid 3
8. Check Valve 2A
9. Check Valve 2B
MU4260
Conditions:
• Ignition ON, engine
running
• Boom angle is
below 40°
• Travel select lever in
(F) FORWARD or
(R) REVERSE
• Park brake ON
• Service brake
DISENGAGED
With boom below 40°, when frame
swaying to the left, the right front tire
comes off the ground.
Check electrical wiring.
Check solenoid coils 12A and 12B on the
Stabil-TRAK™ manifold for correct
resistance (7-9 ohms).
Replace solenoid(s).
Remove solenoid cartridges 12A and 12B
from Stabil-TRAK™ manifold and inspect
for debris or damage. Refer to Section
8.14.9, “Stabilizer Cylinder.”
Clean passages or replace cartridge(s).
Replace check valve(s).
Inspect check valves on frame sway
cylinder. Refer to Section 8.14.8, “Frame
Sway Cylinder.”
Replace check valve(s).
Inspect check valves 2A and 2B on the
stabilizer cylinder. Refer to Section
8.14.9, “Stabilizer Cylinder.”
Not
OK
Not
OK
Not
OK
Not
OK
Not
OK
If OK
If OK
If OK
If OK
Refer to Stabil-TRAK™ Electrical
Circuit Operation and Troubleshooting
on pages 10.10 or 10.20