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 TM 55-1905-223-24-6
i. Lube Oil System. (FIGURE 1-11). A two piece lube oil tank stores the lubricant serving the upper and lower
impeller drive enclosures and the right and left steering gear boxes to which it is connected. The lube oil tank is
mounted above the Bowthruster Assembly or inside the Paint Locker, Inboard Bulkhead when material
change is completed. The cover includes an oil inlet, a fill pipe, and mountings and cable connections for the
internal float switch. The fill pipe cap includes an air filter. On the front of the tank is an oil level sight glass and
the outlet fitting. The lube oil system requires 30 liters to fill the gear enclosures and to fill the reserve tank to the
mid point on the sight glass. The outlet fitting near the bottom of the reservoir feeds an oil line going directly to
the lower impeller drive enclosure through a fitting on the passage cover. Gravity flow through the line keeps the
enclosure flooded at all times. The upper gear enclosure and the right and left steering gear boxes must be filed
manually through fill plugs provided for this purpose. All of the lubricated enclosures are vented into a common
vent line that returns to the reservoir through a fitting on the cover.
j. Hydraulic Oil Tank. (FIGURE 1-12). The hydraulic oil tank is a 44-liter operating reservoir for the steering
gear hydraulic fluid. An oil return line connects to a filter and inlet fitting in one corner of the cover. An adjacent
fill pipe is fitted with an air filter cap. A thermometer and sight gauge on the tank side show temperature and
level of the tank contents. A low level float switch is mounted in one corner of the tank. Closing the switch
activates a remote alarm on the control console when the oil level drops to the set point level. The remaining
surface area on the tank cover is used for mounting hydraulic aggregate components. The tank is called the
hydraulic aggregate base.
k. Hydraulic Aggregate. (FIGURE 1-13). The hydraulic aggregate is made up of components mounted on
top of the hydraulic oil tank. Included are the pressure regulating valve, the valve assembly, the terminal
box, the load holding valve, and inter-connecting pipelines, hoselines, and wiring which integrate these
components with the pump, the oil tank, the steering gear motors, and controls.
I. Hydraulic Pump. (FIGURE 1-14). The pump is driven by a 20-horsepower electric motor. An adapter
bolts to the pump housing and to the motor housing and assures alignment of the two keyed shafts. An
opening in the adapter provides access to the internal shaft coupling.
m. Pump Motor. (FIGURE 1-14). The 20-horsepower pump motor operates on 220 volt, 60 Hertz, 3
phase ac power.
n. Oil Return Filter. (FIGURE 1-15). The oil return filter is installed on the hydraulic tank cover at the oil return
inlet. The return oil flow into the tank is piped first through the filter to remove foreign particles. The
replaceable filter element is cleaned periodically.
o. Feedback Unit. (FIGURE 1-16). The feedback unit is housed in a rectangular box mounted above the right
steering gear assembly. A shaft protruding through the bottom of the box couples to the shaft protruding
through the top of the steering assembly (see FIGURE 1-10). This mechanical link drives internal
potentiometers whenever the steering gear is active. Electrical signals from the potentiometers operate local
and remote thrust direction indicators. The local indicator is mounted on the box cover. The remote indicator is
on the pilot- house control console.
Change 3
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