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 TM 55-1905-222-14
c.
Emergency lowering of the ramp is accomplished by the use of a hydraulic hand pump. The emergency
ramp hoisting device consists of two 3-ton chain fall hoists Each hoist consists of a reeving chain with swivel hook,
selector lever, chain attachment, gear housing assembly and bottom hook
d.
A hydraulically actuated mechanical latch is provided to secure the ramp in the fully raised position. The
latch is unlocked by hydraulic pressure when the ramp control lever is placed In the RAMP DOWN position. The latch is
automatically locked when the ramp is raised. The latch can be unlocked during emergency conditions (no pressure In
the ramp hydraulic system, engines not operating, etc) by operating the hand pump
e.
The ramp winch Incorporates an automatic winch reversing mechanism. The mechanism, prevents cable
overrun and coiling when the ramp lowering cycle is completed or Interrupted. When the cable goes slack, the
mechanism. causes the hydraulic oil to bypass the winch and is returned to the reservoir
1-27
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