JLG sky trak mmv Service Manual page 679

Step 4:
a. Use your left foot to depress the service brake
pedal.
b. Move the travel select lever to the [R] REVERSE
position.
c. Ease your left foot partially off the service brake
pedal so that the Stabil-TRAK™ light remains
ON.
d. With your right foot, increase the engine rpm
slightly, as necessary, just enough to back the
vehicle off the block. While backing off the block,
the front left tire should remain off the ground.
IMPORTANT: Perform Steps 5 through 9 with the
engine rpm at idle.
Step 5:
a. Keep the service brake pedal depressed.
b. Move the travel select lever to the [N] NEUTRAL
position.
c. Take your foot off the service brake pedal. The
Stabil-TRAK™ light should remain ON and the
front left tire should remain off the ground.
Step 6:
a. With the travel select lever in the [N] NEUTRAL
position, engage the parking brake switch.
b. Move the travel select lever to the [F] FORWARD
position. The Stabil-TRAK™ light should remain
ON and the front left tire should remain off the
ground.
Step 7:
a. With the parking brake switch ON, move the
travel select lever to the [N] NEUTRAL 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 nor-
mal during this test.
f. The Stabil-TRAK™ 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°.
Model MMV Rev. 12/04
Stabil-TRAK™ System
Step 8:
a. Depress the service brake pedal.
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™ light should go OFF.
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™
light should go OFF.
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 [N] NEUTRAL.
m. Lower the boom.
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 pro-
cedures in Section 11.4, Stabil-TRAK™ Circuit Operation
and Troubleshooting , to repair the system.
11.29