INSPECTION -624880200

TM 5-2420-222-20-1

CLEANING - CONTINUED

WARNING

Compressed air used for blowing away chips, dirt, etc., must leave nozzle at less than 30 psi (207 kPa) to

prevent personal injury. Be certain that nozzle is rated to provide a maximum of 30 psi (207 kPa). Be sure

to wear safety goggles or lenses when using compressed air. Compressed air and particles moved by

compressed air can cause damage to your eyes.

Use clean rags dampened with electrical parts solvent cleaning compound (item 4, Appendix C) to clean dust, dirt, and

grease off of electrical wiring harnesses and connectors. If parts are too dirty to wipe clean, dip them into cleaning

compound, shake off excess, and wipe clean with clean dry rags. To get dirt out of recessed area, use a stiff brush. Wiring

harnesses and connectors must be completely dry before use. Dry wiring harnesses and connectors with clean dry rags

and allow to air dry. To speed up drying time, use dry compressed air.

Cover parts after cleaning to protect from dust and dirt.

The general cleaning covered by other manuals is as follows:

TM 9247: Materials Used for Cleaning, Preserving, Abrading, and Cementing Ordnance Materiel and Related

Materials, Including Chemicals.

TM 9214: Inspection, Care, and Maintenance of Antifriction Bearings.

TB 750-1047: Elimination of Combustables from Interiors of Metal or Plastic Gasoline and Diesel Fuel Tanks (TO

36Y31-3-6).

INSPECTION

The reason for parts inspection is to find out which parts can be used and which must be replaced. Specifications and

tolerances are given in this manual, but sometimes, you, the inspector must make the decision which parts should be

replaced.

To find out if you can use a part that is otherwise in good condition, check the clearance between mating surfaces. If

clearance is within tolerance, reinstall part.

Inspect castings for wear, distortion, cracks and breaks in and around drilled and tapped holes. Look for damaged threads.

Carefully look at all machined surfaces and polished areas. Use a strong light to shine across polished surfaces to check

for score marks, cracks, breaks and too much wear.

Inspect gears for cracked, nicked and chipped teeth. Look for metal to metal abrasion, pitting, and wear. When a gear is

found to be defective, replace it and its mating gear.

SERVICE REPLACEMENT KITS

Many service replacement parts are available in various undersize and/or oversize, as well as standard sizes. Also, service

kits for reconditioning certain parts and service sets which include all of the parts necessary to complete a task are

available (TM 5-2420-222-20P).

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