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TM 10-4930-250-13&P
Section V. UNIT MAINTENANCE PROCEDURES
4.8 FUEL DELIVERY EQUIPMENT MAINTENANCE.
The AAFARS fuel delivery equipment includes all the hoses, couplings, manifolds and nozzles, and the auxiliary pump.
Couplings include the elbows, tees, crosses and wyes used as fuel hose connection points; the various unisex to candock
adapters; and the recirculation manifold and recirculation wye. All these equipments are equipped with unisex couplings. The
AAFARS uses two-inch, non-valved unisex couplings; two-inch, valved unisex couplings; and three-inch, valved unisex
couplings. The following unisex coupling maintenance procedures apply to all unisex couplings throughout the system,
including the CCR and D-1 nozzle assemblies. The two-inch suction hoses, the two-inch wyes and all three-inch unisex
couplings have stainless steel long and short lugs in the coupling body; three-inch dust caps have aluminum lugs. The
discharge hoses, tees, crosses, manifolds and elbows unisex couplings have aluminum long and short lugs. Refer to appendix
C, Repair Parts and Special Tools List for the correct part number for lugs for the coupling under repair.
4.8.1
REPLACE TWO-INCH VALVED UNISEX COUPLING. (Refer to figure 4-2.)
This task consists of:
a. Removal
b. Installation
INITIAL SET-UP:
Tools:
Materials/Parts Required:
Tool Kit, General Mechanics
Petrolatum (Appendix F, Section II, Item 5)
(Appendix B, Section III, Item 1)
Rag, Wiping (Appendix F, Section II, Item 7)
Chemical and Oil Protective Gloves
Seal (Appendix 1, Item 5)
(Appendix B, Section III, Item 2)
O-ring (Appendix 1, Item 6)
O-ring (Appendix 1, Item 8)
O-ring (Appendix 1, Item 7)
General Safety Requirements:
Equipment Condition:
AAFARS shutdown (NORMAL
SYSTEM
WARNING
SHUTDOWN,
para. 2. 5. 1)
•
Fuels are toxic and flammable. Do not get on person
or clothing. Do not use near open flame. Area
should be well ventilated.
•
Using dry cleaning solvents incorrectly can cause
injury or even death.
•
Fuel is flammable. Do not smoke.
a.
Removal.
Rubber gloves should be worn when handling fueling system components due to the toxic effects of
some fuel additives.
(1) Remove ball retaining screw (1) and O-ring (2). Discard O-ring (2).
(2) Position a wiping rag under coupling (3) and orient coupling (3) screw hole toward wiping rag. Push in and rotate
unisex coupling (3) back and forth until all 41 balls (4) have collected in the wiping rag.
4-8
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