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 TM 55-1905-221-14-1
e. Ramp-Slack Cable System. When the ramp is lowered and comes to rest on some surface; the able will
continue to pay out from the winch time unless it is immediately shut off. This causes the cable to bind and kink when
attempting to raise the ramp to the closed position. A system of limit switches, a cable shield, and a directional control
valve have been added to remedy this operational problem. Briefly, the system works in the following way:
(1) The limit switch, located in the pilot house aft of the ramp control lever energizes the system when the ramp
control lever is pulled.
(2) The limit switch at the ramp is activated as soon as slack exists in the cable.
(3) The solenoid valve shuts off the hydraulic fluid to the cable winch and returns it to the reservoir thereby not
allowing any more cable to pay out.
f. Emergency Winch Controls.
(1) Emergency controls are provided to lower the ramp if the ramp hydraulic system should fail. These controls
are located at or near the winch.
(2) To lower ramp during an emergency, open the normally closed ball valve (1, fig. 2-20) and pull the manual
brake release (2, fig. 2-20) to control ramp fall.
2-22
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