Lull 944E-42, Service Manual

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Stabil-TRAK™ System
10.28 Model 644E-42/944E-42 Rev. 6/04
Step 7
a. With the parking brake switch ON, move the travel select lever to the (N) NEUTRAL DETENT
position.
b. Lower the boom to exactly 45°.
c. Frame sway the vehicle no more than 5° to the left.
d. Frame sway the vehicle back to 0°.
e. Frame sway the vehicle no more than 5° to the right.
Note: Observe that frame sway will be slower than normal during this test.
f. The Stabil-TRAK™ lock light should remain ON and the front left tire should remain off the ground.
The front left tire should not raise or lower during frame sway.
g. Frame sway back toward 0°, leaving the vehicle swayed to the right approximately 1° to 2°.
Step 8
a. Depress the service brake pedal fully.
b. Disengage the parking brake switch.
c. With the range select lever in (1) FIRST gear, move the travel select lever to the (R) REVERSE
position.
d. Release the service brake pedal to deactivate the Stabil-TRAK™ system.
e. The Stabil-TRAK™ lock light should go OFF and the Stabil-TRAK™ slow pivot light should come
ON.
f. The front left tire should return to the ground while the vehicle travels in reverse.
g. Depress the service brake pedal to stop the vehicle.
Step 9
a. With the service brake pedal depressed and the boom angle at exactly 45°, move the range select
lever to (3) THIRD gear.
b. Move the travel select lever to (F) FORWARD.
c. Release the service brake pedal to deactivate the Stabil-TRAK™ system. The Stabil-TRAK™ lock
light should go OFF and the Stabil-TRAK™ slow pivot light should come ON.
d. Slowly drive the vehicle forward against the block to stop the vehicle from moving forward.
e. With the front left tire against the block, frame sway the vehicle no more than 5° to the left.
f. Check that the front left tire remains on the ground. It is normal for the front left tire to raise slightly
when swaying to the left, but the tire should immediately lower when the frame sway function is
stopped.
g. Frame sway the vehicle back to 0° and pause briefly.
h. Frame sway the vehicle no more than 5° to the right.
i. Check that the front right tire remains on the ground. It is normal for the front right tire to raise
slightly when swaying to the right, but the tire should immediately lower when the frame sway
function is stopped.
j. Frame sway the vehicle back to 0°.
k. Depress the service brake pedal.
l. Shift the travel select lever to the (N) NEUTRAL DETENT position.
m. Lower the boom.
Note: If Steps 1-9 prove positive, the Stabil-TRAK™ system is functioning properly, and the vehicle can be returned
to service. If any of these steps indicate that the Stabil-TRAK™ system is not functioning properly, follow the
procedures in Section 10.8, “Stabil-TRAK™ Hydraulic Circuit Operation and Troubleshooting,” to repair the system.
Stabil-TRAK System Test Procedures
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