ROTARY WINDOW

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ROTARY WINDOW

TM-55-1905-223-24-18-2 Landing Craft Utility (LCU) NSN 1905-01-154-1191 Basic Craft Part II Manual

PROPELLER SHAFT ASSEMBLY EXPANDER TUBE BRAKE

TM 55-1905-223-24-18-2

Table 3-2. Troubleshooting - CONT

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ROTARY WINDOW - CONT

STEP 4. Check air chamber drain holes.

a. Remove spinning frame assembly (para. 3-193). Dry out entire chamber with a soft

clean cloth.

b. Check drain holes in the bottom of the fixed frame. Holes should be free of

obstructions. If holes are plugged up, clean out both holes with a small piece of wire.

Be sure holes are entirely clean before reassembly. Remount spinning frame.

57. Unit vibrates excessively.

STEP 1. Check motor shaft taper for dirt, corrosion, etc.

Remove spinning frame from motor shaft, clean shaft and inside of tapered hole, remount

spinning frame assembly (para. 3-193).

STEP 2. If unit still vibrates.

Replace spinning frame assembly (para. 3-193).

58. Control box is defective.

NOTE

Turn both switches OFF before proceeding.

STEP 1. Check for 115 Vac across terminals 1 and 2.

If voltage is not present, ship's wiring is defective.

Refer to ELECTRICAL

TROUBLESHOOTING.

STEP 2. Be sure a MOTOR circuit breaker is depressed. Check for 115 Vac across points A

and B.

If voltage is not present, motor circuit breaker is defective. Replace motor circuit breaker.

STEP 3. Be sure HEATER circuit breaker is depressed. Check for 115 Vac across point C and

terminal 5.

If voltage is not present, heater circuit breaker is defective. Replace heater circuit breaker.

STEP 4. Turn MOTOR switch ON, check for 115 Vac across points D and E.

If voltage is not present, motor switch is defective. Replace motor switch (para. 3-193).

STEP 5. Check for 115 Vdc across terminals 3 and 4.

If voltage is not present, rectifier is defective. Replace rectifier (para. 3-193).

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