MAINTENANCE OF M939 SERIES VEHICLES - OD1661 - LESSON 1/TASK 1
FIGURE 13.
MEDIUM WRECKER - CONTROLS AND
INDICATORS (CONTINUED).
(8) Cable Tensioner Control Valve, controls the tension on the
winch cable. This lever is positioned up to release tension and down
to apply tension.
(9) Boom Control Lever, raises the boom when pulled toward the
operator and lowers the boom when moved away from the operator.
(10) Hoist Control Lever, raises the boom hook when pulled toward
the operator and lowers the hook when moved away from the operator.
(11) Crowd Control Lever, retracts the boom when pulled toward the
operator and extends the boom when moved away from the operator.
(12) Swing Control Lever, swings the crane assembly right when
pulled toward the operator and left when moved away from the
operator.
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