Mueller Centurion Series - Improved Fire Hydrant; Inserting Extension Section

MUELLER
®
Improved Fire Hydrant
Inserting Extension Section (All Models Prior to 1962)
Remove four Bonnet Bolts and turn
operating nut in the opening direction
until free of stem. Remove Bonnet.
Place new Stem Coupling Sleeve part onto
Upper Stem. Screw new Stem Coupling
part onto Lower Stem as far as threads
permit.
Screw Upper Stem into Stem Coupling
until it contacts the Lower Stem. Turn Stem
Coupling and Upper Stem so that slot in
Thimble aligns with the tongue and groove
of stems. Hold Upper Stem in alignment
and screw Stem Coupling upward until
tongue and groove of stems rmly lock
together. Tighten with wrench. With Stem
Coupling in place, slide Sleeve downward
so that lower end of sleeve surrounds
upper end of Stem Coupling. Be sure
Sleeve projections t into Stem Coupling
slots. With Sleeve in place, tighten set
screw in Sleeve.
Remove four bolts in stufng box.
Lubricate A-366 Brass Sleeve. Slide
Sleeve over threaded area of stem
to protect O-rings from damage by
threads. Lift stufng box off carefully.
Remove Brass Sleeve.
Unbolt Trafc Flange and remove Upper
Barrel.
Unscrew set screw in Sleeve. Screw
Stem Coupling down against shoulder.
Slide Sleeve up and unscrew Upper
Stem from Stem Coupling. Unscrew
Stem Coupling from Lower Stem. Screw
Extension Stem Coupling down on
Lower Stem against shoulder.
4
EQUIPMENT & TOOLS NEEDED – PPE: Safety shoes, safety vest, safety glasses, work gloves.
Tools:
1
/4” hex-head wrench, A-51 lubricating oil, A-311 operating wrench, A-367 brass sleeve.
5
4.
Screw Extension Stem into Extension
Coupling until it contacts Lower Stem.
Align tongue and groove of stems
with hole in Extension Stem Coupling.
Screw Extension Stem Coupling
upward until tongue and groove of
stems rmly lock together. Tighten with
wrench, then, screw in Set Screw in
Extension Stem Coupling.
2.
1.
5.
3.