Lull 944E-42 Service Manual - Manual (Page 765)

10.7 Model 644E-42/944E-42 Rev. 6/04
Stabil-TRAK™ System
The following describes the three basic modes of the
patented Stabil-TRAK™ system. The vehicle may
operate in any one of the following three modes.
a. Free Pivot Mode (6)
With the boom below 40°, the Stabil-TRAK™ system is in
the FREE PIVOT MODE and the rear axle is allowed to
pivot freely. The frame sway control will function normally.
Both Stabil-TRAK™ lights (7) on the front dash will be
OFF.
b. Locked Mode (8)
With the boom above 40° and by activating one or more
of the functions (as follows), the Stabil-TRAK™ system is
in the LOCKED MODE. The rear axle is locked so it is
rigid with the frame. The Stabil-TRAK™ lock light (9) on
the front dash will be ON. The Stabil-TRAK™ slow pivot
light (10) on the front dash will be OFF.
• Engaging the parking brake switch.
• Placing the travel select lever in the (N) NEUTRAL
DETENT position.
• Depressing and holding the service brake pedal.
The frame sway control will function slower than normal
in this mode.
c. Slow Pivot Mode (11)
With the boom above 40°, the Stabil-TRAK™ system is
now in the SLOW PIVOT MODE when the service brake
pedal is not applied and the transmission is in gear. In this
mode the rear axle is UNLOCKED and is allowed to pivot,
but will respond SLOWLY to changes in terrain. The
Stabil-TRAK™ slow pivot light (12) on the front dash will
be ON. The Stabil-TRAK™ lock light (13) on the front
dash will be OFF.
Note: SN 0160003881 & Before Only - The Slow Pivot
Mode can also be activated with the boom below 40° by
applying enough pressure (150 psi [10,3 bar] at the
service brake valve) to activate the system, but still allow
movement of the vehicle in either forward or reverse
direction.
The frame sway control function will function normally in
this mode.
To check that the Stabil-TRAK™ System is functioning
properly, refer to page 10.17 or page 10.26 for the proper
system function.
0000000
RPM X 100
5
10
15
30
20
25 F
1/2
E 104
176
80 248
120 °C
°F
D
r/min
MU0090
6
7
0000000
RPM X 100
5
10
15
30
20
25 F
1/2
E 104
176
80 248
120 °C
°F
D
r/min
MU0100
8
9
10
0000000
RPM X 100
5
10
15
30
20
25 F
1/2
E 104
176
80 248
120 °C
°F
D
r/min
MU0110
11
12 13