Lull 944E-42 Service Manual - Manual (Page 795)

10.37 Model 644E-42/944E-42 Rev. 6/04
Stabil-TRAK™ System
10.8.8 Hydraulic Troubleshooting - Slow Pivot Mode, Rod Oil Out
MU4260
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
8.14.9, “Stabilizer Cylinder.”
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
8.14.9, “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.”
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
on pages 10.10 or 10.20