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 TM 55-1925-273-10-1
0089 00
NOTE
Shifting the two-speed valve must always be done with the control lever in the NEUTRAL posi-
tion. The knob may be shifted at any time, but the control circuit will prevent a speed range shift
while the towing machine is moving. Once the towing machine stops, the speed range shift will
automatically take place, corresponding with the current position of the speed range knob.
6.
Place the speed range selector (figure 11, item 6) in the LOW SPEED mode by fully pulling it up to its fully extended
position.
NOTE
The towing machine will heave at half the normal speed and at a rate proportional to the lever
movement. This mode develops twice the normal torque at half the normal speed.
7.
Place the directional control lever (figure 11, item 5) in the HEAVE position. The towing machine will operate at a
speed proportional to the lever movement.
TOWING MACHINE OPERATION FREE SPOOLING MODE
1.
Perform the Towing Machine Operation System Setup procedure in this work package.
2.
Verify that the SYSTEM READY indicator (figure 11, item 1) on the towing machine operator control panel (figure 11,
item 2) is illuminated.
3.
Verify that the SYSTEM PRESSURE gauge (figure 11, item 3) indicates that the towing machine hydraulic system is
supplying hydraulic fluid to the system.
4.
Place the local or remote switch (figure 11, item 4) in the local position by pushing it down fully to the NORMAL
OPERATION AT CONSOLE mode.
5.
Ensure that the directional control lever (figure 11, item 5) is in the NEUTRAL position. The NEUTRAL position is
centered between the PAYOUT and HEAVE positions.
NOTE
The free spooling mode is used to rapidly deploy the towline after the tow has been made up and
the line has sufficiently been payed out (usually 200 to 2000 feet) to safely free spool to the
desired scope. The hydraulic power unit should be in operation for this mode to permit alterna-
tive modes of operation (heave or payout) to compensate for any sudden changes in the operating
condition.
6.
With the towline under light tension, slowly release the clutch brake (figure 7, item 1) by loosening the clutch brake
handwheel (figure 7, item 2) until the line begins to pull out.
! CAUTION
This procedure produces heat in the clutch brake band. Carefully observe the brake for over-
heating. If the brake overheats, release the clutch brake by using the handwheel or by slowing
down the LT. Failure to do so will result in damage to the brake lining. In the event of overheat-
ing and subsequent tightening of the clutch brake, there may be a tendency for the clutch brake to
freeze or cement to the drum surface if left tight for long periods of time. It is good practice to
loosen the clutch brake at the earliest opportunity to prevent any damage to the brake.
7.
Accelerate the LT to approximately 4 knots and allow the towline to be pulled out at a speed of up to 400 ft/min (122 m/
min). Tension can be maintained on the towline by tightening and loosening the clutch brake (figure 7, item 1) with the
clutch brake handwheel (figure 7, item 2).
0089 00-15
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