Lull 1044C-54 Series II Service Manual - Manual (Page 299)

Frame Tilt and Oscillation
31200079 7-17
3. Adjust frame level indicator so ball is centered over 0° mark. Tighten
indicator screws.
Rear Oscillation Lock System
General Description, Models with Control Manifold Hydraulics
The Rear Oscillation Lock System provides safety and stability by
preventing the frame from rotating on the rear axle.
The rear oscillation lock will be operational when any or all of the following
conditions apply:
• When the boom angle exceeds 40°.
• When the service brakes are applied.
• If a system component fails.
When the boom angle is above 40°, the following conditions apply:
• Rear axle cylinder locks, preventing the frame from rotating on the rear
axle.
Note: Rear oscillation lock cylinder can be unlocked by the drive lockout override
switch. See Drive Lockout Override in the Operator & Safety Manual.
• Transmission is inoperative.
• Frame tilt function is disengaged.
• REAR OSC LOCK light in the instrument cluster illuminates.
• When the frame tilt function is disengaged, it CANNOT be overridden
by the operator unless the boom angle is below 40°.
When the service brakes are applied, the following conditions apply:
• Rear axle cylinder locks, preventing the frame from rotating on the rear
axle.
• The rear oscillation lock cylinder can be unlocked by the frame tilt func-
tion when the boom is below 40°.