Manitowoc Published 10-01-2012, Control # 045-08 1-41
777 SERVICE MANUAL INTRODUCTION
1
LOAD DRUM PAWL
See Figure 1-27 and 1-28 for following procedures.
The following description does not include auxiliary drum
(boom mounted) pawl application. This material will be
covered later with the description for the auxiliary drum.
The ratchet and pawl mechanisms provide a positive means
of locking the front and rear load drums. Each pawl system
operates independently and is controlled by a 2-position,
double throw switch located on the front console.
The pawl should be used to maintain loadline positions,
especially when the crane is in the park position or left
unattended. Likewise, the front and rear drum pawls should
be used for locking the corresponding drum in position when
not in use. The pawl of a selected drum must be disengaged
before drum can rotate, because the PC will not command
down against the pawl.
Should a pawl switch be accidentally activated, the PC
opens the circuit to the appropriate drum brakes. The load
drum brakes then applies, both hydraulic and band.
FIGURE 1-27
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