1
End cap
10
Felt
2
Gasket
11
Screen
3
Felt-
12
Screw and lockwasher
4
Screen
13
Set screw
5
Seat cap
14
Base assembly
6
Spacer gasket
15
Adjusting spring
7
Needle
16
Adjusting wheel
8
Push pin
17
Jacket
9
Body
18
Seal ring
Figure 76. -Continued.
against the needle point. Remove the seat cap, clean all parts, and blow out the bushing with compressed air to remove
any foreign particles. Place the spacer washer on the seat cap and firmly screw it into the bushing to prevent air leakage.
b. Checking Needle Travel. With the shutterstat completely dismantled with the needle and seat cap in place, place
the body assembly in the vise with the bushing adjusting stem up. Insert the push pin against the needle. Attach a dial
indicator to the body with the plunger against the push pin. Turn the indicator to zero. Insert a small pin through the hole
in the needle seat cap and move the needle to the other side of the seat. Use a light pressure. The needle travel should
not be less than 0.005 inch or more than 0.006 inch. If the travel is more than 0.006 inch, tighten the needle cap to make
the correction. If the travel is less than 0.005 inch, replace the spacer gasket and recheck the needle travel. Install the
shutterstat end cap. Connect an air line to the fitting in the end cap. Plug the side opening with a 1/8-inch IPS pipe plug.
With the air applied hold the shutterstat body under water and test for leakage out of the threaded end of the bushing.
With the pin, move the needle to the upper seat. Test for air leaks. If either seat shows air leakage, rotate the needle with
a small shank screwdriver. This will lap the needle and the seats. Lap the needle with the air applied.
192. Shutterstat Reassembly
a. Place the body in a vise, with the spacers, and the end cap (1) down. Drop the push pin (8) and adjusting wheel
(16) into place, and install the adjusting spring (15). Screw in the base assembly (14), and lock the set screws (13) into
position. Install the jacket (17), locking into place with the screw and lockwasher (12). This screw also serves as a lock
for the adjusting wheel (16).
b. Install the shutterstat (par. 81b).
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