Lull 1044C-54 Series II Operation Manual - Manual (Page 41)

STABILITY SYSTEMS
33
When the boom angle is above 20° but below 40°, the
rear axle cylinder is orificed, slowing movement of the
frame on the rear axle. This increases the lateral (side-
to-side) stability.
When the boom angle is above 40°, the rear axle
cylinder locks, preventing the frame rotating on the rear
axle. This changes the stability diagram from a triangle
to a rectangle (when viewed from above) and
substantially increases the vehicle’s lateral stability.
(See Diagram 2)
General Description, Drive
Lockout Override System
The Drive Lockout Override System does two things
when engaged with the boom angle above 40°:
•
Allows the transmission to be engaged in first gear
only.
•
Unlocks the rear oscillation lock cylinder and allows
very slow (orificed) movement. This increases
dynamic lateral stability while the vehicle is being
driven.
Operation of the Drive
Lockout Override System
To operate the Drive Lockout Override System:
Note: These procedures only apply to situations where
the boom is above 40° elevation.
1. Plan your route of travel. The surface must be
firm and as level as possible. Always avoid rough
or steep areas.
2. Level the frame before picking up the load. If load
is suspended (slung load), make sure tag lines
are secure and manned. Never let a slung load
sway, as this may lead to vehicle tipover or injury
to personnel.
3. With the brakes on, move the shift selector to the
Forward or Reverse position.
4. Using your left foot, press and hold down the
drive lockout override switch. The drive will
engage in first gear only and the vehicle may be
moved.
5. Drive the vehicle very slowly, while carefully
watching the terrain. Make turns smoothly and
slowly.
6. Use the service brakes to stop the vehicle slowly
and smoothly. Releasing the Drive Lockout
Override Foot Switch will disengage the drive,
but this will not activate the brakes.
WARNING
Failure to follow the instructions in this
manual may result in death or serious
personal injury!
OV0070
WARNING
ALWAYS LEVEL MACHINE
BEFORE RAISING BOOM.
WHEN DRIVE LOCKOUT
OVERRIDE IS USED TO MOVE
MACHINE WITH BOOM
ELEVATED, FRAME LEVEL CAN
CHANGE WITH CHANGING
TERRAIN. ADJUST FRAME TILT
TO KEEP FRAME AND BOOM
AS LEVEL AS POSSIBLE WHILE
DRIVING. NEVER EXCEED ±5°
FROM LEVEL. LEVEL FRAME
SLOWLY AND CAREFULLY.
FAILURE TO FOLLOW THE
INSTRUCTIONS IN THIS MANUAL
MAY RESULT IN DEATH OR
SERIOUS PERSONAL INJURY!