Operation – Lull 644E-42 Operation Manual User Manual

Page 83

Operation

Model 644E

Origin 3/04

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-TRAKô system. The Stabil-TRAKô lock light
should go OFF and the Stabil-TRAKô 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-TRAKô system is
functioning properly, and the vehicle can be returned to service. If any of
these steps indicate that the Stabil-TRAKô system is not functioning
properly, contact your local Lull Distributor immediately to repair the
system.

Stabil-TRAK System Test Procedures