Service And Repair Replacing the Air Purge Screw
46
8. Lubricate the three O-rings on the new screw with petroleum jelly and install it with the hitch pin pushed on
and hanging in the vertical position (see Figure 41).
Figure 38. Locating Air Purge Screw
Figure 39. Locating Air Purge Screw Hitch Pin
rjpumps/fig41.eps
Air purge screw
2-inch port
Service screw (beneath protective plug)
Check valve housing
hitch pin
Note that the slot in the
top of the air purge screw is
offset 90 degrees from the
hitch pin
LLD transducer or
MLLD port
Check valve port
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