SUBSECTION 8A
BOOM HOIST SYSTEM
A hydraulically operated pawl engages in the ratchets of the
drum to prevent the rotation of the drum when the operator
so desires. The pawl should be adjusted as described in
Section V of the Operator's Manual.
A planetary lowering system is included on the boom hoist
drum. To raise a load, the drum clutch is engaged and shaft
rotation is transmitted through the clutch to the drum spool
and lagging. The lagging rotates in the same direction as the
drumshaft to take up on the horst line and raise the boom.
When lowering the boom, power is transmitted through the
planetary system which reverses the direction of shaft ro-
tation. See Table 8A-1 for boom hoist brake, clutch, and
pawl operation.
8A-3