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 TM 55-1925-273-10-1
0067 00
TOW WINCH
PRE-USE CHECKS
A. Make sure that unit has been properly lubricated and serviced.
B. Visually inspect Remote Control Station for damage or missing parts.
D. Check wire rope for damage or corrosion.
OPERATION
Operation - Start pump drive engine with hydraulic system aligned for normal operation. (See pump Drive Engine
Operation Instructions).
Back-up Operation - Align valves in accordance with Central Hydraulic System Operating Instructions. Start both
motorized hydraulic system pumps. (See Central Hydraulic System Operating Instructions).
2.
Energize tow winch control panel.
MODES OF OPERATION
CAUTION
Do not exceed 80 FPM Payout speed while powering with the hydraulic motor. Overhauling the motor will cause
cavitation and severe mechanical damage.
The tug and speed must be carefully controlled while powering out the line because the tug can easily overpower
the towing machine motor.
1.
Payout or Heave, Normal and Low Speed Ranges - Set the clutch brake and release the auxiliary brake. With
the control lever in NEUTRAL position put the speed range selector knob into the desired position, up for low
speed, down for normal speed. Select location of operation, put Remote-Local selector up for Local down for
Remote. Push the control lever in the PAYOUT or HEAVE direction. The machine will run at normal speed
proportional to the lever movement.
CAUTION
Since this procedure produces heat in the clutch-brake band it must be carefully observed so as not to smoke the
brake lining. If the band overheats, release the clutch-brake compressor and/or slow down the tug.
In the event of overheat and subsequent tightening of the clutch-brake, the clutch-brake may freeze to the drum
surface if left tight for long periods of time. Loosen the clutch-brake at the earliest opportunity to assure that it does
not stick.
Check tug speed before tightening the clutch-brake. Severe shock loading can occur if the clutch-brake is tightened
while the line is being pulled out at full speed. The speed should be minimal when the clutch-brake is tightened.
2. Free Spooling - With the towline under light tension and the hydraulic motor in its stopped and braked condi-
tion, the clutch-brake set and the auxiliary brake released, slowly release the clutch-brake compressor until the line
begins to pull out.
The towline may be pulled out at a speed of up to 400 ft./min. (approximately 4 knots). Tension can be maintained
on the rope by adjusting the clutch-brake compressor to achieve a slight braking action on the rotating drum.
Placard 34. Towing Machine (Sheet 1 of 2)
0067 00-44
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