T M 9 - 2 3 2 0 - 2 7 9 - 1 0 - 1
M983 Tractor Operating Procedures (Cont)
(1) Push swing lever (1) up to rotate crane clockwise. Pull lever (1) down
to rotate crane counterclockwise.
(2) Pull boom lever (2) down to raise boom (3). Push boom lever up to
lower boom.
C A U T I O N
When boom is being extended, hoist lever must be
pushed up to allow space between sheave at end of
boom and sheave at load hook to prevent cable from
breaking.
(3) Push hoist lever (4) up to lower load hook (5).
(4) At same time, push extend 1 + 2 lever (6) up to extend first and
second stages of boom.
(5) Push extend 3 + 4 lever (7) up to extend third and fourth stages of
boom (3).
(6) Push hoist lever (4) up to lower load hook (5). Connect load straps or
rigging to hook.
(7) Pull hoist lever (4) down to raise load hook (5).
(8) Pull extend 3 + 4 lever (7) down to retract third and fourth stages of
boom (3).
(9) Pull hoist lever (4) down to raise load hook (5).
(10) Pull extend 1 + 2 lever (6) down to retract first and second stages of
boom (3).
(11) Pull hoist lever (4) down to raise load hook (5).
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