Service And Repair
Replacing the Air Purge Screw
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9.
When the screw is turned clockwise all the way down, but not tight, use the forefinger of one hand to push the
hitch pin up as shown in diagram 1 of Figure 41.
10. While holding the hitch pin up with the forefinger of one hand, place the gloved forefinger of your other hand
against the end of the pin as shown in diagram 2 of Figure 41.
11. Push the end of the pin with the gloved forefinger until it snaps into the retaining position as shown in diagram
3 of Figure 41.
Figure 41. Installing Air Purge Screw Hitch Pin In The Retaining Position
12. If you removed the 2’’ NPT plug to access the screw, get a new 2.234’’ ID x 0.139’’ wide o-ring from the
hardware/seal kit and install it on the 2’’ NPT plug. Lubricate the o-ring with petroleum jelly and install the plug
into the leak detector port. Torque the plug to 20 - 50 ft-lbs (27 - 67 N•m).
If you removed a line leak detector or pressure transducer to access the air purge screw, apply an adequate
amount of fresh, UL classified for petroleum, non-setting thread sealant to the threads of the device and screw
it into the 2’’ port. Torque the device until leak free.
13. Get a new check valve housing o-ring (2.609’’ ID x 0.139’’ wide) from the hardware/seal kit. Lubricate the o-
rings with petroleum jelly and install it on the housing as shown in Figure 28 on page 30.
Push the hitch pin's up with one forefinger.
Note that the crimped leg of the pin is facing
down and the straight leg up.
While holding the pin up with one forefinger
position the gloved forefinger of the other hand
against the other end of the pin.
Push the end of the pin with the gloved
forefinger until it snaps into the retaining
position.
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2
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