Mueller Centurion Series - Page 3

MUELLER
®
Centurion
®
Series Fire Hydrant
Adding an Extension
CAUTION: Always ll the oil reservoir with the Bonnet installed, the Hydrant in its normal upright position, and
the main valve fully closed. If the Hydrant is lled with lubricant under any other circumstances, excess lubricate can
overll the Bonnet and create a pressure lock. This could result in damage to the seals or Bonnet or prevent proper
Hydrant operation.
6.
Attach Upper Barrel with Trafc Flange
Halves (with bevel on outer edge
downward) and Bolts; being sure Trafc
Flange O-ring* is in groove in Upper
Barrel. Tighten Bolts to 60 ft-lbs.
8.
9.
Remove Oil Filler Plug in side of
Bonnet. Pour MUELLER Hydrant
Lubricant into Oil Reservoir until it is
level with Oil Filler Plug Hole. Replace
Oil Filler Plug (see Lubrication section
on page 8).
Torque Bonnet Bolts to 40-80 ft-lbs.
Torque Hold-Down Nut to 200-300
ft-lbs. after Bonnet Bolts are tight. Open
Gate Valve. Unscrew one Hose Nozzle
Cap slightly to bleed air. Open Hydrant
fully. Tighten Hose Nozzle Cap when
water starts owing and check all ange
connections for leaks. Turn Operating
Nut to fully closed position and remove
Hose Nozzle Cap to allow Barrel to
drain. Replace Hose Nozzle Cap.
10.
7.
Turn Operating Nut in closing direction
to make sure Main Valve is closed
tightly, then turn in opening direction
approximately 1/4 turn to relieve
tension on operating mechanism.
Check Bonnet O-ring* for proper
position and condition. Attach Brass
Sleeve to Upper Stem and lubricate
outside to protect O-ring Seals from
thread damage. Place Bonnet onto
Upper Barrel and assemble Bonnet
Bolts only hand-tight. Remove Brass
Sleeve. Reassemble Operating Nut,
Anti-Friction Washer, and Hold-Down
Nut (snug-tighten). Be sure O-ring
Seals are in good condition at thread
shoulder on outside of Hold-Down Nut
and on inside where contact is made
with Operating Nut.
*To determine correct O-rings for Bonnet and Ground Line anges, which are similar in
appearance: smaller diameter O-ring is used at Bonnet ange; larger at Ground line ange.
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3
EQUIPMENT & TOOLS NEEDED – PPE: Hard hat, safety shoes, safety vest, safety glasses, work gloves.
Tools: Wrenches, A-311 operating wrench.