Chapter 4. AVIATION INTERMEDIATE MAINTENANCE AND TROUBLSHOOTING

TM 55-4940-353-13&P

CHAPTER 4

AVIATION INTERMEDIATE MAINTENANCE AND TROUBLSHOOTING

SECTION I. PREPARATION FOR STORAGE OR RESHIPMENT

Remove the adaptors from the racks on either side of

4-1.

When it is necessary to store or reship the Hose

the reservoir and package separately. The Hose Tester

Tester the oil in the reservoir must be pumped out. The

may be boxed in a cardboard carton with a burst

unit and its components should be wiped clean using a

strength of 275 pounds. It should be surrounded by

suitable solvent such as PD-680, Type II.

suitable dungaree to ensure a stable position within the

carton. The separately boxed adaptors should be

WARNING

enclosed in the carton before it is sealed. After sealing,

the carton should be marked in accordance with MIL-

Use volatile solvents only in a well ventilated

STD-129.

area. Avoid prolonged contact with the skin.

SECTION II. MAINTENANCE PROCEDURES

4-2.

The regular periodic inspection procedures

removing bottom plug and spring, the valve can be

presented in Section m of Chapter 3 are sufficient to

removed from the bottom of the regulator.

determine that the Hose Tester is functioning properly.

If during the course of these procedures, it is determined

c. If Unit Will Not Regulate to Pressure Needed, or

that a component is malfunctioning, it should be

if Pressure Becomes Excessive -remove bottom plug,

repaired as described in the following paragraphs.

spring and valve. Clean and check O-ring, valve stem

and valve seat for wear or damage. Replace worn or

4-3.

Air Regulator. When the Air Regulator (figure 4-

damaged parts. Install Repair Kit No. RRP-95-131 for

complete overhaul.

2) is not functioning correctly, the following maintenance

action will correct the fault:

d. If Unit Leaks at Relief Port (A) -- Install proper

repair kit as listed above.

a. Occasionally remove bottom plug and clean

plug, body and valve seat.

e. When Replacing Diaphragm Assembly -The

b. To Disassemble -shut off air to regulator and

RRP-96-213 Diaphragm Assembly includes a relieving

vent air line on both sides of regulator. Turn adjusting

disk seal (not shown) installed.

screw counterclockwise to relieve compression on the

4-4.

Air Lubricator. Should an Air Lubricator (figure

spring. Remove screws, cover, spring, and pressure

4-4) malfunction, take the following corrective action:

disk. Diaphragm assembly can now be removed. By

4-1