h. Reinstall the diaphragm and thrust plate assembly on
the regulator body so that the thrust plate is down and the
sealing surface fits into the groove in the body.
i. Place the slip ring, diaphragm plate, adjusting spring,
and spring button (concave side up) on the diaphragm In the
order named.
j. Place the spring case on the body and thread together
carefully.
Tighten the spring case with a torque of approx-
imately 150 inch-pounds,
k. Connect the regulator to the cylinder.
4.4 SEAT ASSEMBLY REPLACEMENT
a. Perform steps a through e, paragraph 4.3.
b. Remove the seat and retainer assembly with an 11/16 -
inch wrench. Replace the retainer seat,
c. Remove the thrust pin and seat assembly.
d. Replace the seat assembly and thrust pin.
e. Put the small end of the thrust pin in the seat assembly
carefully. Do not damage the seating surface.
f. Insert the thrust pin and seat assembly in the marginal
spring.
g. Slide the seat and retainer assembly over the thrust
pin carefully and tighten it in the body with a torque of approx-
imately 120 inch-pounds.
h. Perform steps h through k, paragraph 4.3,
4.5 RELIEF VALVE SEAT REPLACEMENT
a. Disconnect the regulator from the cylinder.
b. Mount the regulator body securely in a vise or other
suitable holding device with the relief valve facing UP.
c. Remove the relief-valve cap by unscrewing it from the
body.
d. Lift out the relief-valve spring and the relief-valve stem
and seat assembly. Replace the seat.
e. Reinsert the relief-valve stem and seat assembly, relief-
valve spring, and relief-valve cap in the regulator body.
f. Connect the regulator to the cylinder.
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