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 TM 55-1905-223-24-6
Table 2-2. Troubleshooting - CONT
Malfunction
Test or Inspection
Corrective Action
STEP 2. Check electric motor at bowthruster is operating by visually verifying rotation of jaw
coupling. Check circuit breaker at EP.
STEP 3. Check sight gauges for low hydraulic fluid. Check piping connections and hoses for leaks and
cracks. No leaks found - add fluid (Table 2-1, Item 2).
STEP 4. Visually verify point of rudder transmitter at bowthruster is pointed directly aft.
Assure proper alignment by rotating bowthruster toward forward while applying foot pressure to
adjustment device until adjustment device seats into the mounting flange. Remove four screws
holding the plexiglass cover atop the potentiometer. Adjust pointer toward aft by loosening the
three screws holding the potentiometer locking ring. Turn potentiometer by hand until the pointer
opposite the direction of thrust (aft). Tighten three screws holding the potentiometer locking ring.
Replace plexiglass cover and tighten screws.
3. Sight Gauge/Thermometer reading exceeds 150oF
STEP 1. Check fluid level for LOW reading.
Add fluid to bring level to HIGH mark (Table 2-1, Item 2).
STEP 2. Check by feeling Hydraulic vane pump, HY-motors, and brakes for excessive temperature.
4. Vibration/Noise Excessive
Check for loose mounting bolts.
Tighten mounting bolts. Refer to appropriate paragraph in this manual for correct torque.
5. Hydraulic oil is frothy.
STEP 1. Check for clogged air filter on oil tank. Clean filter (Table 2-1, Item 5).
STEP 2. Check for low oil level. Add oil (Table 2-1, Item 2).
2-15
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