| Tweet |
Custom Search
|
|
|
||
 TM 55-1905-223-24-10
Table 1-1. Bow Ramp Winch Equipment Data - CONT
Characteristics
Reference Data
Performance
At Normal Hydraulic Pressure and Flow
Line Pull
10,000 lb each line
Line Speed
45 fpm
Manual Operation
Approximately 61 lb with a 14
in handcrank
1-10. Safety, Care, and Handling . Safety precautions must be observed at all times while performing maintenance.
General WARNINGS and first-aid data appear in the front of this manual. Review all safety information before starting
any task. Carefully read through an entire maintenance procedure before performing any maintenance function. Make
sure the task can be done safely. All WARNINGS, CAUTIONS, and NOTES are of great importance to your personal
safety and the safety of the equipment.
Section III. PRINCIPLES OF OPERATION
Overview of bow ramp winch assembly.
The Principles of Operation section will tell you basic information about how this assembly works.
1-11. General . The bow ramp is raised and lowered by a single, split-drum, electro-hydraulic winch subsystem and
associated wire ropes, chains, stoppers, and sheaves. The winch has a grooved drum of minimum barrel diameter and
stowage capacity to handle two wire ropes, one to control each side of the ramp. Each wire rope is led to forecastle deck
and rigged with turnbuckles by two chains, each led through a chain sheave in the bow. Stoppers are provided to
prevent loss of ramp elevation in the event of wire rope breakage. Stoppers also provide support for the ramp, as
required, without stressing wire ropes or the winch during vehicle handling. The winch is fitted with a hydraulic brake.
The winch is capable of up to 10,000 lb of line pull at 45 feet per minute on two 3/4 inch wire ropes. A manual interlock
switch prevents starting the motor with the emergency hand crank engaged. A slack wire limit switch is provided to
prevent excessive slack in the wire rope when unspooling. The winch is remotely con- trolled from three control stations,
one in the pilothouse, one on the forecastle deck and one at the winch. Each control station has a control panel
containing toggle switches, push-button indicator switches, and indicator lights. The switches are used to start and stop
the electric motor in the winch-assembly and operate the ramp system. Indicator lights indicate subsystem operation
status, tension on wire ropes, and high temperature of hydraulic fluid. The pilothouse control station is provided with a
power cut-off switch. When operating from the pilothouse control station, all other control stations are inoperative.
1-6
|
||
|
||
