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TM 10-4320-351-14
4.11.2 Replace Flange Mounted Three-Inch Unisex Coupling. (Refer to figure 4-8.)
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 10)
(Appendix B, Section III, Item 1)
O-Ring (Appendix I, Item 46)
Chemical and Oil Protective Gloves
O-Ring (Appendix I, Item 58)
(Appendix B, Section II, Item 2)
General Safety Requirements:
Equipment Condition:
Pumping assembly shut down (para. 2.6)
WARNING
Fuels are toxic and flammable. Do not get on person
Or clothing. Work in well ventilated area. Do not
Smoke. Ensure equipment is well grounded.
a.
Removal.
WARNING
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. Rotate
unisex coupling (3) back and forth to allow the 41 balls (4) to collect in the wiping rag.
(3)
Separate the unisex coupling (3) and inlet (5). Collect the continuity ball (6) and spring (7).
(4)
Remove and discard outside O-ring (8).
a.
Installation.
WARNING
Rubber gloves should be worn when handling fueling system components due to
the toxic effects of some fuel additives.
NOTE
When inserting balls in unisex coupling ball race, use caution to avoid dropping
loose balls. Recommend working over a wiping rag.
(1)
Lightly lubricate outside O-ring (8) with petrolatum and install in second (square) groove of inlet (5).
4-20
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