Table 4-9. Air Conditioner System Noises - Troubleshooting.

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Table 4-8. Air Conditioner Lubrication Troubles Troubleshooting - continued

TM-55-1905-220-14-8 Landing Craft Utility LCU 1671-1679 NSN 1905-01-009-1056 Manual

Table 4-9. Air Conditioner System Noises - Troubleshooting. - continued

TM 55-1905-220-14-8

4-5. GENERAL (Continued).

Table 4-9. Air Conditioner System Noises - Troubleshooting.

NOTE

Refer to paragraph 4-29 and 4-30 for air conditioner and compressor

maintenance instructions.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. Compressor noises.

Step 1. Loose hold-down bolts.

Tighten bolts.

Step 2. Improperly aligned, loose or worn compressor drive:

a. Direct drive. Loose or misaligned coupling.

b. Direct drive. Loose coupling flange on compressor or motor shaft.

c. Belt drive. Loose, misaligned or worn belts.

d. Belt drive. Loose flywheel.

e. Belt drive. Loose motor pulley.

Realign, tighten or replace worn parts:

a. Realign coupling or tighten bolts.

b. Tighten setscrews. Replace key if worn.

c. Realign or adjust belt tension. Belt slack should be at the top. Replace

belts if worn.

d. Check flywheel nut, washer and key. Tighten or replace if worn.

Step 3. Insufficient clearance between piston and valve plate. (A sharp, medium pitched metallic

hammer is heard as a cylinder is unloaded.)

Replace over-tolerance parts.

Step 4. Motor or compressor bearings worn.

Replace worn bearings.

4-40