TM 55-1930-209-14&P-21
(3)
Engage drum clutch slowly enough to achieve a gradual start.
(4)
Release and apply drum brakes gradually and evenly.
(5)
With the drum firmly braked, engage the dog then release brake slowly until dog locks firmly into ratchet
without slippage or shock.
(6) To keep the load under control, engage the drum clutch enough so the dog can be readily disengaged.
(7)
Release the dog, then release the clutch and instantly apply the brake.
WARNING
Do not use throttle control as a direct accelerator to supply extra power for momentary loads.
This causes power surges and excessive machinery speed which is dangerous and difficult to
control. Always set throttle control at most advantageous operating speed, and let governor
compensate for variations in load.
b.
Operating Speed. Adjust speed of winch with throttle lever (Fig. 2-2) which is connected through an air line and
mechanical linkage to engine governor. Thereafter, the speed selected is maintained by engine governor.
c.
Fleet Angle
(1)
-On installations where wire rope passes over lead sheave and on to drum, lead sheave must be located a
sufficient distance from drum to maintain a small fleet angle at all times. The fleet angle is the side angle at which cable
approaches drum from the sheave (See fig. 2-3).
(2) For best cable service, maximum fleet angle should not be more than 1-1/2 degrees.
(3)
Maximum fleet angle is measured between center line of sheave and rope when it is at end of traverse
travel on drum. Fleet angles of 1-1/2 degrees are equivalent to approximately 38 feet of lead for each foot of cable
traverse either side of center line of sheave. A smooth drum on this winch requires a distance of not less than 42 feet
between lead sheave and drum.
d.
Winding First Layer on Drum
(1)
Insure that only right lay wire rope is used on this winch.
(2)
If necessary, use a 2" x 4" or similar piece of wood to keep the coils tight when winding the first layer. If
the wire rope spreads, check that the rope is not left lay.
e.
Coiling Wire Rope. When hand coiling wire rope, on the floor or bench, always coil it in the direction that will
take twist out of the rope. Rope coiled in the wrong direction causes twists and bends which result in fraying and
weakening of rope. Always coil right lay wire rope in a clockwise direction.
2-5
