Lull 6K Service Manual - Manual (Page 503)

Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 7-1
Section 7 — Frame Tilt and Oscillation
Frame Tilt System
General Description
Fig. 7-1: Frame Tilt System Components
(Ref. Fig. 7-1) The frame tilt system allows the machine to be levelled
laterally (side-to-side) up to 12.5°, left or right. The lateral angle of the
machine, relative to level ground, is shown on the frame level indicator
(See “Frame Level Indicator” on page 7-17).
When hydraulic pressure is applied to the frame tilt cylinder the frame
pivots around each axle. Two counterbalance valves (one on the rod end
and one on the base end) are used to inhibit hydraulic fluid from exiting the
frame tilt cylinder.
Function is controlled by the frame tilt control valve (see page 7-3) located
in the operator’s compartment. The system is functional only while the
engine is running and the boom is below 40°.
Frame Tilt
Cylinder
Multi-Spool
Frame Tilt
Control Valve
Control Valve
G
1020