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 TM 55-1925-273-10-1
0039 00
illuminates a light on the towing machine control panel (operator) on the 01 level. A similar alarm indicator is also installed
in the pilothouse. The alarm operates by means of a proximity switch (figure 12, item 11). When a hub member passes close
by the proximity switch, the switch closes. When the hub member passes away, the switch opens. The signal from this
switch is routed to the towing machine control panel mounted on the starboard bulkhead of the main deck vestibule. There
the input is analyzed and when the signal reaches the predetermined limit for excessive slippage, the alarm light is illumi-
nated, and the alarm horn sounds.
Operating with too little cable on the drum can cause loss of the tow cable. To prevent this, a maximum cable OFF shutdown
is installed. When the cable OFF indicator system indicates that less than 300 feet (91 meters) of cable remains on the drum,
the payout function of the towing machine is disabled and the STBD or PORT MACH MAX CABLE OFF BYPASS
pushbutton indicator (figure 14, item 7) illuminates. This function operates by deenergizing the solenoid operated direc-
tional control valve that controls the paying out of the tow cable. If it is desired to pay off cable beyond the automatic cutoff
point, the operator can press the STBD or PORT MACH MAX CABLE OFF BYPASS pushbutton indicator to bypass the
cutoff.
The operator is alerted to the presence of towing machine hydraulic system faults (low hydraulic fluid level, high hydraulic
fluid temperature) by an indicator light (figure 14, item 8) and alarm horn. The alarm is indicated at the towing machine
control panel (operator) and in the pilothouse. These alarm conditions are activated by Normally Open (NO) switches for
hydraulic fluid level and hydraulic fluid temperature. When the hydraulic fluid level falls too low or its temperature rises too
high, the appropriate switch closes, and the alarm is activated.
A similar alarm is activated when the system hydraulic fluid pressure falls too low. This alarm also lights a lamp (figure 14,
item 9) and sounds the horn when the Normally Open (NO) system hydraulic fluid pressure switch closes.
END OF WORK PACKAGE
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