TM 55-1930-209-14&P-21
Section XIII. Winch Frame
6-49
General
a.
The Connaco 40,000 lb 2-drum Waterfall Winch is a heavy-duty unit designed for such tasks as anchor handling
and specialized pulling/hoisting operations. The frame components are steel weldments, to transfer the pulling stresses
of up to nearly 20 tons to the ground anchor points without misalignment of the frame or hoisting mechanisms.
b.
The machinery bed is a rigid steel weldment with machined surfaces for bolt-on steel pillow blocks. The bed, or
winch frame, also provides convenient locations for mounting the control mechanisms, piping, and auxiliary equipment
such as the air and hydraulic fluid storage tanks.
c.
The pillow blocks are held in alignment on their machined surfaces by large body fit alloy steel bolts designed to
take the tension and shear loadings imposed.
d.
The fixed end of each brake band is connected to the hoist bed through a 1 1/4 inch pivot pin, held by a pair of
heavy padeyes welded to the winch bed.
e.
The drum dog pivot pins transfer the drum moment load to the bed when engaged. They are mounted in heavy
padeyes welded to a heavy footplate, which in turn is welded to the winch bed.
f.
The winch frame, as a whole, is bolted to fabricated skids for shipping and as a ground mounting when anchored
in place ready to operate.
6-50
Winch frame disassembly, inspection and repair
a.
Disassembly. The winch frame is normally not disassembled. Components such as pillow blocks are unbolted
only when replacement or shop repair is needed.
b.
Inspection. Make the periodic inspections with the winch frame fully assembled. Check for corrosion protection
integrity, and for obvious frame member distortion such as might be caused by overloads, misaligned loads, or improper
use of tractor to move/align the unit.
c.
Repair. Repairs to winch frame components will normally be required only for broken or distorted members.
Repair procedures consist of straightening using hydraulic presses, and of heavy structural cutting and welding.
Realignment and re-machining of bolting pads may be required.
6-51
Winch frame reassembly. Reassembly is in the reverse order of disassembly.
Section XIV. Air System
6-52
General. Operation of the winch is controlled by air pressure. The air pressure is applied to the various drum
clutches, brakes and dogs as directed by the operator at a control console. It is supplied at 6 cfm or more from an
engine-mounted compressor. The compressor keeps the air reservoir at a pressure of 105 to 125 psi. Filtered air is then
supplied to the control stand, and from there directed to the hoist air terminal. The various operating elements receive
controlled air from the air terminal via flexible hoses. System air pressure is required to release the drum parking brakes,
set the drum dogs, engage the drum clutches, and set the drum service brakes.
6-88
