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 TM 55-1905-217-34
Figure 4-41. Winch (hulls 8520-8560 and 8580-8618).
(2) The primary drive housing contains a hydraulic motor which drives the sun gear of a primary
planetary reduction. The output of this reduction is transmitted by a shaft which passes through the center of
the winch barrel to the sun gear of a final planetary reduction in the final drive housing. The output from the
final planetary reduction is transmitted directly to the winch barrel through a spline attaching the final drive
planet hub to the winch barrel.
(3) The internal gear of the primary reduction is held in its drive housing by a metallic friction disc-type
brake. The brake is held engaged by springs, and is released by an annular hydraulic cylinder. This cylinder is
connected to that motor port which is pressurized for reverse rotation, and becomes the exhaust port for
forward rotation. In this way the brake is engaged at all times until the winch is powered in reverse.
c. Disassembly.
(1) Disassembly of final drive assembly.
(a) Remove retaining ring (6, fig. 4-42).
4-62
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