TM 10 4320-303-13
NOTE
Adjusting screw has been factory calibrated and should not be adjusted.
a. Remove eight cover screws (Figure 5-1, 1).
b. Remove cover (2).
c. Remove spring guide (3) and spring (4).
d. Remove nut (5).
e. Remove belleville washer (6), diaphragm washer (7), and diaphragm (8).
f. Remove plug (9).
g. Remove gasket (10) from plug (9). Discard gasket (10).
h. Unscrew disc retainer assembly (11), CCW.
i. Remove disc retainer assembly (11) through hole in bottom of body (12).
j. Remove yoke (13) from body (12).
5.5.1.2 Inspection.
a. Inspect all metal parts for cracks, holes, corrosion, or signs of wear and damage.
b. Inspect spring (4) for bends, corrosion, or damage.
c. Inspect diaphragm (8) for holes, slices, tears, or damage.
d. Inspect all mounting hardware for damage.
e. Replace damaged screws (1), spring (4), diaphragm (8), disc retainer assembly (11).
f. If any other pressure-reducing control components are damaged, replace pressure-reducing control.
5.5.1.3 Assembly.
a. Install yoke (13) in body (12).
b. Insert disc retainer assembly (11) through hole in body (12) and thread disc retainer assembly (11)
into yoke (13) until it bottoms.
NOTE
Disc retainer assembly must enter guide hole in plug as it is being assembled.
c. Install new gasket (10) on plug (9). Install plug (12).
d. Install diaphragm (8), diaphragm washer (7), belleville washer (6) on yoke (13).
e. Install nut (5). Do not tighten nut (5).
f. Adjust diaphragm (8) so that holes in diaphragm (8) align with holes in body (12).
g. Torque nut (5) to 45 to 55 lb in.
5-5
