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6
8. Unscrew the safety plug
(11) from the first stage using
a 3/8" socket and flex wrench.
9. Unscrew the handwheel retainer (18) using the modified
screwdriver. Remove the washer (19), spring (20), handwheel
(21), nylon washer (22) and indicator ring (23) from the stem (30).
10. Using the 3/4" socket and flex wrench, unscrew the
bonnet (24) from the first stage body (32). Pull the stem
assembly out of the bonnet.
11. Remove the back-up ring (26), o-ring (27), brass washer
(28) and Teflon washer (29) from the stem (30).
NOTE: It is possible that some or all of these parts have
remained in the bonnet (24).
Check Bonnet
12. Remove the o-ring (25)
from the bonnet (24).
13. Insert the squared end of
the stem (30) into the seat &
disc retainer (31) and unscrew
it from the first stage body (32).
14. Using a magnifier, inspect
the condition of the crown.
There should be no scratches,
nicks or dents on the crown
seating surface.
15. Remove the pressure gauge (38) using a 7/8" crowfoot
and flex wrench. Remove o-ring (35) from the pressure gauge.
CAUTION:
Be careful not to damage the fill port (36) with
the wrench while removing the pressure gauge (38).
16. Using your fingers, unscrew the fill port cap (34) from the
fill port (36). Remove the o-ring (35) from the fill port cap.
LPIS / DSIS Technical Manual
Crown
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