OFFSHORE PEDESTAL-MOUNTED CRANES 65
10.2 Cabs and Enclosures
10.2.1 General
As practical, all cabs and enclosures shall be constructed to protect the upper structure machinery, brakes, clutches,
and the operator’s station from the weather. On cranes without cabs or enclosures to protect the operator, upper
structure machinery, brakes, and clutches shall be adequately protected from the corrosive influence of the offshore
environment.
Figure 9—Basic Four-lever Crane Control Diagram
Table 19—Four-lever Crane Control Function
Control Operation
Swing Control
Push forward to swing toward boom, swinging left for right
side operator position or swinging right for left side
operator position
Center (neutral) to free swing
Pull back to swing away from boom
Auxiliary hoist control
Pull rearward to hoist
Center (neutral) to hold load
Push forward to lower
Main hoist control
Pull rearward to hoist
Center (neutral) to hold load.
Push forward to lower
Boom hoist control
Pull rearward to raise boom
Center (neutral) to hold boom position
Push forward to lower boom
Boom telescope (where
applicable) (more than one
lever may be provided)
Pull rearward to retract
Center (neutral) position to hold length
Push forward to extend
Swing
control
Boom
control
Hoist
control
auxiliary
As viewed from operator's seat
Hoist
control
main
Boom
control
Toward
boom
From
boom
Extend
Retract
Lower
Raise
Lower
Raise
Lower
Raise
Copyright American