TM 1-1740-204-13&P
4-15.1
REMOVAL
In order to remove and replace the air pilot valve (1), the air valve assembly (2) must be removed. Removal and
replacement of the air valve assembly (2) will require the replacement of the air valve gasket (3).
a.
Loosen the flare fittings of tubing (4) and (5) and remove.
b.
Remove the air valve assembly (2) along with the air pilot valve (1) by removing the four bolts (6).
c.
Remove air valve gasket (3) and discard.
d.
Grip the air valve assembly (2) in a non-marring vise. Remove the air pilot valve (1) by pivoting it about the
pipe nipple and bushing assembly (7). Remove the elbows (8) and (9) from the air pilot valve (1).
e.
Remove the nipple and bushing assembly (7) from the air pilot valve (2) and remove the filter screen (10).
Inspect the filter screen (10) for contaminants and clean if necessary.
4-15.2
INSTALLATION
a.
Insert the filter screen (10) into the air valve assembly (2).
b.
Grip the air valve assembly (2) in a non-marring vise. Apply Teflon tape (D1) or sealant (D2) on the threads
of pipe fittings (7), (8) and (9). Thread the pipe nipple and bushing assembly (7) onto the inlet of the air
valve assembly (2). Attach the air pilot valve (1) by pivoting it about the pipe nipple and bushing assembly
(7). Align the air pilot valve (1) in the orientation as shown in the illustration. Thread, tighten and position
elbows (8) and (9) as shown in the illustration.
c.
Position a new gasket (3) between the air valve assembly (2) and the body of the booster pump (11). Fasten
the assembly to the pump (11) with four bolts (6). Align and tighten the flare fittings of tubing (4) first and
then (5). Align elbows (8) and (9) if necessary.
d.
This completes the removal and replacement of the booster pump air pilot valve. Perform leak check and
confidence test procedure per paragraph 2-8.
END OF TASK
4-16
