Chapter 4 UNIT MAINTENANCE INSTRUCTIONS

TB 5-4220-200-12-1

Chapter 4 UNIT MAINTENANCE INSTRUCTIONS

Section I. SERVICE UPON RECEIPT OF MATERIAL

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GENERAL.

The services performed upon receipt of a new or used open circuit Military SCUBA System are the responsibility

of the using organization.

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!NSPECTlNG AND SERVICING THE EQUIPMENT

The using organization will inspect the system for completeness against items listed in Table 1-1 "Tabulated Data"

and Section III "Basic Issue Items" of Appendix B. Any evidence of damage, or missing components or parts will

be listed at once and reported to the proper authority for corrective action.

Demand Regulator. Complete procedures 1 through 3 of Table 4-1. Following reassembly of regulator

conduct applicable pre-dive checks and services, Table 2-1.

Twin Tank Block Assembly. Complete procedures 1 through 4 of Table 4-1. Following reassembly per-

form applicable pre-dive checks and services Table 2-1.

Pressure Gauges. Conduct semi-annual check and services, Item 2, Table 4-2.

Section II. REPAIR PARTS, TOOLS, SUPPLIES, AND TEST EQUIPMENT

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GENERAL.

This section locates and identifies the repair parts, standard tools, special tools, equipment and supplies authorized

the organization in the maintenance support of the open circuit SCUBA System.

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REPAIR PARTS AND-SUPPLIES.

Repair Parts are located in Section II thru Section VII Appendix E. Supplies are listed in Section II Appendix F.

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TOOLS AND TEST EQUIPMENT.

Standard Tools are identified in Section VIII of Appendix E. Special Tools are listed in Section IX and Test Equip-

ment is listed in Section X.

Section Ill. PREVENTIVE MAINTENANCE CHECKS AND SERVICES

4-6 GENERAL.

This section prescribes cleaning and lubrication instruction, and inspection procedures as well as the annual and

semi-annual checks and services in tables 4-1 and 4-2.

4-7

CLEANING AND LUBRICATION.

a. Cleaning.

CAUTION

Do not use nitric acid on plastic or rubber parts.

Clean all metal parts, except those with plastic or rubber parts, in a water and nitric acid solution (item 5, App. F).

which contains no more than 15 to 20% nitric acid. Do not allow the metal parts to remain in the acid solution for

more than 5 minutes. To remove extra thick verdigris use the wire brush on chrome plated surfaces. After cleaning,

rinse each metal part in water and sodium bicarbonate (15 to 20%) solution to neutralize the acid. Rinse in fresh

water and dry with a soft dry cloth. Wash each rubber and plastic part with warm soapy water. Rinse in fresh water

and dry with a soft dry cloth.

Lubrication. No lubrication is required.

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