FSR/FST First Stage Technical Maintenance Manual
5
8. Secure the vice mounting tool into a bench vise. Lift of the
molded ring (6). Using the 34mm thin wrench (pn AT47)
remove the diaphragm clamp (7).
10. To remove the diaphragm (10), insert LP air nozzle into the
MP port. While holding your thumb over the diaphragm, inject
a small blast of air into the MP port to pop out the diaphragm.
Lift out the valve lifter (11).
NOTE: The thickness of the wrench must not exceed
11mm or it will not t between the thread and the ang.
11. Turn the rst stage over and using a 6mm hex key, remove
the HP balance plug (19). Separate the HP valve (15) and
spring (16) from the HP plug.
13.
Place the rst stage body onto the padded surface with the
MP side facing up (diaphragm side). Using a small wooden
dowel, insert the dowel into the center hole at a slight angle.
Press on the inside edge of the crown (14). To keep the
crown from tilting, press evenly around the perimeter of the
crown. Remove the o-ring (13) from the crown.
Removal of Diaphragm Clamp (XTX, Black Pearl &
Tungsten Series)
9. Lift out the spring carrier (9).
12. Remove the o-rings (13 & 18) from the outside of the HP
plug (19). Using a brass or plastic o-ring tool, carefully
remove the o-ring (17) from the inside of the HP plug.
CAUTION: Before proceeding, make sure you are
working over a padded surface; otherwise, damage to
the crown could occur.
14. Remove the o-ring (13)
from the crown (14).
NOTE: If the crown tilts and gets stuck inside the body, turn
the body over and straighten the crown before proceeding.
Removal of Crown (FSR Models Only)
NOTE: FST models do not have a removeable crown. The
crown is machined inside the body.
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