Copyright 1997-MUELLER CO. Form 10642- Rev. 2/09-2M-1 Printed in U.S.A.

MUELLER®

MODERN CENTURION®

FIRE HYDRANT

MAIN OFFICE and PLANT500 West Eldorado StreetDecatur, Illinois 62522www.muellercompany.com

Before removing any bolts(s) holding the hydrant together, shut off gate valve to isolate hydrant from main water source. Loosen (do not remove) one nozzle captwo turns and check for water under pressure inside hydrant - bleed off any pressure, then remove nozzle cap completely. Open hydrant main valve completely.A continuous flow of water, no matter how slight, indicates hydrant is not properly isolated from the main water supply, and that problem must be corrected beforeany hydrant disassembly can proceed. Disassembly of hydrant with pressurized water acting against the main valve could result in unexpected ejection of hydrantparts, debris or high-pressure water stream, which could cause serious bodily injury.

! WARNING

Operating

Instructions for

MMUUEELLLLEERR®® MMOODDEERRNN CCEENNTTUURRIIOONN®® FFIIRREE HHYYDDRRAANNTTInspection and Maintenance

To ensure their readiness for instantaneous use, all firehydrants should be inspected and tested at six-monthintervals.

Inspect visually for damaged or missing parts.

Unscrew one Nozzle Cap slightly and tighten theothers. Open hydrant fully. Tighten the loose NozzleCap when water starts flowing. Remove Oil Filler Plugto check oil level and make sure Stem O-rings are ingood condition. (If oil level is low, fill as shown onpage 3.) Check all Gaskets for leaks. Turn OperatingNut to fully CLOSED position.

If water was coming from Oil Filler Hole, removeHousing and replace the two O-rings. Inspect andclean Stem and replace it if it is corroded or pitted.Check oil level. Replace Housing and retest for leaks.

Use A-367 Brass Sleeve when removing or replacingHousing or Hydrant Barrel to protect O-rings.

Remove one Nozzle Cap and open hydrant fully andflush the Barrel and the hydrant lateral. Turn OperatingNut to fully CLOSED position.

Remove all Nozzle Caps. Clean and lubricate thethreads.

Examine the inside of the Barrel to make certain theDrain Valves have completely drained the water from theBarrel. If the water fails to drain from the Barrel, it may becaused by one or more of the following conditions:

1. Water table in ground higher than drains.2. When hydrant was installed no coarse gravel

was put around the Drains and the ground is ofsuch nature that it will not readily absorb water.

3. Drains stopped up by some foreign substance.4. Failure to leave the Cap off the hydrant to allow

air to enter so Barrel will drain.

Replace Nozzle Caps and Oil Filler Plug.

NOTE: The following procedure can be used to openmost blocked drain valves.

1. If the water level does not drain and remains inthe Barrel at a level just below the nozzles, recapthe nozzles hand tight and then back them off1/4 turn.

2. Open the Main Valve and fill the Barrel ascompletely as possible.

3. Tighten the Nozzle Caps and close the Hydrantto within two or three turns of full closure forseveral seconds.

4. Close the Main Valve completely and recheckhydrant drainage. Repeat this procedure ifnecessary.

The above procedure introduces full line pressure tothe Drain Valves and provides the best method toclean the Drain Valves with water pressure.

IMPORTANT –– Initial installation of the hydrant MUSTBE MADE PROPERLY so the Safety Flange will functionin the ground properly. It should be blocked at groundline and around shoe by concrete or some similarsubstance to prevent the ground from giving awaywhen the Hydrant is struck.

For additional information on Hydrant anchorage,blocking, and drainage see AWWA Standard C600.

The lower and upper barrels of the Mueller MODERNCENTURION Hydrant can be removed from the shoe(with the shoe under pressure) keeping the Main Valveintact with the shoe by leaving the two-drain ringhousing bolts in place.

1. Tighten Operating Nut to be sureMain Valve is in the fully CLOSEDposition.

4. Lubricate new Shoe and BottomSeat Ring O-ring.

6. Slip new Shoe in place beingcareful not to damage Bottom SeatRing O-ring.

2. Remove all 6 Shoe Bolt Nuts and 2drain ring housing Bolt Nuts.

5. Position Shoe to slip in place.

3. Slip off Hydrant Shoe.

MMUUEELLLLEERR®® MMOODDEERRNN CCEENNTTUURRIIOONN®® FFIIRREE HHYYDDRRAANNTTChanging Shoe

7. Replace Shoe Bolt Nuts. Tighten toapproximately 1800 in-lbs. Thentighten Drain Ring Housing Bolt Nutsto approximately 600 in-lbs.

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MMUUEELLLLEERR®® MMOODDEERRNN CCEENNTTUURRIIOONN®® FFIIRREE HHYYDDRRAANNTTTo Replace Nozzles

4. Lubricate O-ring on new Nozzle.Screw new Nozzle in place hand tightand place Nozzle Wrench behindthreaded section of Nozzle so thatWrench gaps engage Nozzle drivelugs. Screw on Nozzle Cap to hold theWrench in place. Attach a length ofpipe to handle of Nozzle Wrench andtighten.

2. Place Nozzle Wrench behindthreaded section of Nozzle so thatWrench gaps engage Nozzle drivelugs. Replace Nozzle Cap and tightenuntil Cap rests loosely against Wrench.

5. Remove Nozzle Cap and drive theNozzle Lock into position between theNozzle and Hydrant Barrel using theNozzle Lock Installation Tool and BrassHammer. Replace the Nozzle Cap.

NOTE: Wear safety glasses whenusing a striking tool.

3. Attach a length of pipe over handleend of Wrench and unscrew theNozzle.

1. Unscrew and remove the NozzleCap. Using a pointed tool or awl,remove the Nozzle Lock. If Nozzle isretained with retaining screw, usescrewdriver to remove screw.

MUELLER

BURY

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MMUUEELLLLEERR®® MMOODDEERRNN CCEENNTTUURRIIOONN®® FFIIRREE HHYYDDRRAANNTTParts

A-52 OPERATING NUTA-53 WEATHER CAPA-3 HOLD DOWN NUT O-RING – INSIDEA-54 HOLD DOWN NUTA-5 HOLD DOWN NUT O-RING – OUTSIDEA-55 HOUSINGA-6 ANTI-FRICTION WASHERA-56 HOUSING BOLTSA-57 HOUSING TOP O-RINGA-13 NOZZLE LOCKA-14 PUMPER NOZZLEA-17 PUMPER NOZZLE CAPA-15 PUMPER NOZZLE CAP GASKETA-16 PUMPER NOZZLE O-RINGA-7 OIL FILLER PLUGA-23 CHAIN CONNECTOR HOOKA-22 CHAINA-12 STEM O-RINGA-58 UPPER STEMA-59 UPPER BARRELA-21 HOSE NOZZLE CAPA-18 HOSE NOZZLEA-19 HOSE NOZZLE CAP GASKETA-20 HOSE NOZZLE O-RINGA-26 SAFETY FLANGE BOLT & NUTA-27 SAFETY FLANGE GASKETA-28 SAFETY FLANGEA-25 SAFETY STEM COUPLINGA-30 CLEVIS PINA-29 COTTER PINA-32 LOWER BARRELA-31 LOWER STEMA-33 STEM PINA-36 UPPER VALVE PLATEA-34 DRAIN VALVE FACINGA-35 DRAIN VALVE FACING SCREWA-43 SEAT RINGA-39 SEAT RING TOP O-RINGA-38 DRAIN RING HOUSING GASKETA-40 DRAIN RING HOUSINGA-42 DRAIN RINGA-41 DRAIN RING HOUSING BOLT & NUTA-44 SEAT RING BOTTOM O-RINGA-45 MAIN VALVEA-46 LOWER VALVE PLATEA-48 CAP NUT WASHERA-47 CAP NUT SEALA-49 CAP NUTA-50 SHOEA-37 SHOE BOLT & NUTA-51 HYDRANT LUBRICATING OIL

26”

18”

Bury - 1’6” (0.46mminimum; longer by 6’

(152 mm) intervals

8”

1. Remove the Weather Cap from theHydrant.

2. Remove the Oil Filler Plug and checkthe oil level. Oil should be level withthe Oil Filler Plug hole.

3. If oil is low, use a small funnel andadd MUELLER Hydrant Lubricant.

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MMUUEELLLLEERR®® MMOODDEERRNN CCEENNTTUURRIIOONN®® FFIIRREE HHYYDDRRAANNTTFilling Oil Reservoir

4. Replace the Oil Filler Plug and theWeather Cap.

CAUTION: Always fill the oil reservoir with the Bonnet installed, the hydrant in its normal upright position, and the main valvefully closed. If the hydrant is filled with lubricant under any other circumstances, excess lubricant can overfill the reservoir andcreate a pressure lock. This could result in damage to the seals or Bonnet, or prevent proper hydrant operation.

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MMUUEELLLLEERR®® MMOODDEERRNN CCEENNTTUURRIIOONN®® FFIIRREE HHYYDDRRAANNTTRemoving Main Valve From Lower Barrel Flange

9. Unscrew one Hose Nozzle Cap slightly tobleed air. Open Hydrant fully. Tighten HoseNozzle Cap when water starts flowing andcheck all gaskets for leaks. Turn Operating Nutto fully closed position and remove HoseNozzle Cap to allow Barrel to drain. ReplaceHose Nozzle Cap.

10. Turn Operating Nut in the closing directionto assure Main Valve is closed tightly, then turnin opening direction 1/4 turn to relieve tensionon operating mechanism.

1. Remove Weather Cap, Hold Down Nut, Anti-Friction Washer, and Operating Nut. LubricateBrass Sleeve and slide over threaded stem endto prevent O-ring damage. Unbolt and removeHousing. Remove Safety Flange Bolts andSafety Flange.

4. Straighten Stainless Steel Lock Washer,unscrew Cap Nut and remove Washer, StemSeal, Lower Valve Plate, Main Valve and SeatRing. (On hydrants 1997 and newer, Main Valvecan be reversed to provide new seal.) Clean,inspect and replace any damaged parts.Replace Drain Valve Facings. Inspect andlubricate Top and Bottom Seat O-rings (replaceif necessary). Lubricate all threaded surfacesand reassemble. With Cap Nut tightened, bendedges of Stainless Steel Lock Washer over oneflat on the Lower Valve Plate and one flat onthe Cap Nut.

6. Tighten Main Valve to 200 ft-lbs. Turn onwater at the Gate Valve and remove Wrenchfrom Stem by removing Clevis Pin.

2. Remove Upper Barrel. Remove Upper Stemand Stem Coupling from Lower Stem. Slideslotted end of Wrench over Lower Stem. Alignholes in Wrench and Stem and attach Wrenchto Stem with a Clevis Pin. Lower Support Armonto the flange of Lower Barrel and tightenThumb Screw to hold Main Valve in the closedposition. Shut off water at the Gate Valve.

5. Lower Main Valve assembly and carefullythread Seat Ring into the base of the Hydranthand tight. Raise the Main Valve leaving about1/2” of play between the Main Valve and Seat.Lower Support Arm onto flange of LowerBarrel and tighten Thumb Screw.

3. Remove Main Valve assembly by turningWrench counter-clockwise and lift out Wrench,Lower Stem, Main Valve Assembly and SeatRing from Hydrant Barrel as a unit.

7. Reassemble Upper Stem to Lower Stem.Place Upper Barrel in place and reassembleSafety Flange.

8. Attach the Brass Sleeve to Upper Stem andlubricate outside to protect O-ring Seals fromthread damage. Bolt the Housing to UpperBarrel. Remove Brass Sleeve; reassembleOperating Nut, Anti-Friction Washer, and HoldDown Nut.* Be sure O-ring Seals are in goodcondition at thread shoulder on outside ofHold Down Nut and on inside where contact ismade with Operating Nut. Remove Oil FillerPlug in Housing. Pour MUELLER HydrantLubricant into Oil Reservoir until it is level withOil Filler Plug hole. Replace Oil Filler Plug andattach Weather Cap.

CAUTION: Always fill the oil reservoir with the Bonnet installed, the hydrant in its normal upright position, and the main valve fully closed. If the hydrantis filled with lubricant under any other circumstances, excess lubricant can overfill the reservoir and create a pressure lock. This could result in damage tothe seals or Bonnet, or prevent proper hydrant operation.

*Tighten Hold Down Nut to 200-300 ft-lbsof torque. If torque wrench is notavailable, use a 3 lb. hammer to strike theend of the A-311 wrench firmly two timesto assure the nut is properly tightened.

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MMUUEELLLLEERR®® MMOODDEERRNN CCEENNTTUURRIIOONN®® FFIIRREE HHYYDDRRAANNTTRemoving Main Valve From Top of Upper Barrel

CAUTION: Always fill the oil reservoir with the Bonnet installed, the hydrant in its normal upright position, and the main valve fully closed. If thehydrant is filled with lubricant under any other circumstances, excess lubricant can overfill the reservoir and create a pressure lock. This couldresult in damage to the seals or Bonnet, or prevent proper hydrant operation.

*Tighten Hold Down Nut to 200-300 ft-lbsof torque. If torque wrench is notavailable, use a 3 lb. hammer to strike theend of the A-311 wrench firmly two timesto assure the nut is properly tightened.

1. Remove Weather Cap, Hold Down Nut,Operating Nut and Anti-Friction Washer.Lubricate Brass Sleeve and slide over threadedstem end to prevent O-ring damage. Unbolt andremove Housing. Remove Brass Sleeve.

5. With Cap Nut tightened to 100 ft-lbs on 51/4” Hydrant or 50 ft-lbs on 4 1/2” Hydrant,bend edges of Stainless Steel Lock Washer overone flat on the Lower Valve Plate and one flat onthe Cap Nut.

8. Attach the Brass Sleeve to Upper Stem andlubricate outside to protect O-ring Seals fromthread damage. Place Housing onto UpperBarrel and tighten Bolts. Remove Brass Sleeve.Reassemble Operating Nut, Anti-Friction Washer,and Hold Down Nut.* Be sure O-ring Seals arein good condition at thread shoulder on outsideof Hold Down Nut and on inside where contactis made with Operating Nut. Remove Oil FillerPlug in Housing. Pour MUELLER HydrantLubricant into Oil Reservoir until it is level withOil Filler Plug hole. Replace Oil Filler Plug. Screwon Weather Cap.

2. Slide slotted end of Wrench over top of Stemand engage the slot with Pin welded to UpperStem. Tighten “T” handle of Wrench firmly.Lower support arm onto top of Upper Barrel andtighten Thumb Screw to hold the Main Valve inthe closed position. Shut off water at the GateValve. Remove Main Valve assembly by turningSeat Wrench counter-clockwise.

6. Lower Main Valve into the Barrel, turn SeatWrench clockwise, and carefully thread MainValve and Seat Ring into the base of the Hydranthand tight. Raise the Main Valve leaving about1/2” of play between the Main Valve and Seat.Lower Support Arm and tighten Thumb Screw.

4. Straighten Stainless Steel Lock Washer,unscrew Cap Nut and remove Washer, StemSeal, Lower Valve Plate, Main Valve and SeatRing. Clean, inspect and replace any damagedparts. (On hydrants 1997 and newer, Main Valvecan be reversed to provide new seal.) ReplaceDrain Valve Facings. Inspect and lubricate Topand Bottom Seat O-rings (replace if necessary).Lubricate all threaded surfaces and reassemble.

3. Lift out Wrench, Upper and Lower Stem, MainValve Assembly and Seat Ring from HydrantBarrel as a unit.

7. Turn Seat Wrench clockwise to tighten MainValve to 200 ft-lbs. Turn on water at the GateValve and remove Seat Wrench by loosening “T”Handle.

9. Unscrew one Hose Nozzle Cap slightly tobleed air. Open Hydrant fully. Tighten HoseNozzle Cap when water starts flowing and checkall Gaskets for leaks. Turn Operating Nut to fullyclosed position and remove Hose Nozzle Cap toallow Barrel to drain. Replace Hose Nozzle Cap.

10. Turn Operating Nut in the closing directionto assure Main Valve is closed tightly, then turn inopening direction 1/4 turn to relieve tension onoperating mechanism.

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MMUUEELLLLEERR®® MMOODDEERRNN CCEENNTTUURRIIOONN®® FFIIRREE HHYYDDRRAANNTTFacing of Hose Nozzles

1. Loosen Nuts on Safety Flange Bolts. 3. Rotate upper barrel section asdesired.

5. Tighten Safety Flange Bolts.

6. Turn Operating Nut in the closingdirection to assure Main Valve is closedtightly, then turn in opening direction1/4 turn to relieve tension on operat -ing mechanism.

2. Turn Operating Nut slightly in theopening direction to relieve compres -sion between barrel sections.

4. Tighten Operating Nut, turning inclosing direction.

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MMUUEELLLLEERR®® MMOODDEERRNN CCEENNTTUURRIIOONN®® FFIIRREE HHYYDDRRAANNTTInserting Extension Section

1. Remove the Weather Cap, Hold DownNut, Anti-Friction Washer and OperatingNut from the Hydrant. Lubricate outside ofBrass Sleeve and slide over threaded stem toprevent O-ring damage. Unbolt and removethe Housing. Remove Brass Sleeve.

3. Remove the Upper Barrel and removeStem and Safety Stem Coupling by removingthe lower Stainless Steel Cotter Pin andClevis Pin. 7. Attach Upper Barrel to Extension Barrel

with Safety Flange halves (with bevel onouter edge downward) and Bolts, beingsure Safety Flange Gasket is in place.

2. Unbolt and remove Safety Flange.

5. Attach Extension Barrel to Lower Barrelwith solid Flange halves (without groove)and Bolts, being sure Flange Gasket is inplace.

8. Attach Brass Sleeve to Upper Stem andlubricate outside to protect O-ring seals fromthread damage. Bolt Housing onto UpperBarrel and remove the Brass Sleeve.Reassemble Operating Nut, Anti-FrictionWasher and Hold Down Nut* Be Sure O-ringseals are in good condition at thread shoulderon outside of Hold Down Nut and on insidewhere contact is made with Operating Nut.Remove Oil Filler Plug and pour MUELLERHydrant Lubricant into Oil Reservoir until it islevel with Oil Filler Plug hole. Replace Oil FillerPlug and Weather Cap.

4. Place Extension Stem and ExtensionCoupling on Lower Stem and retain it withStainless Steel Clevis Pin and Cotter Pin.

6. Assemble Upper Stem and Safety StemCoupling onto Extension Stem and retain itwith Stainless Steel Clevis Pin and Cotter Pin.MAKE SURE SAFETY STEM COUPLING ISINSTALLED WITH NOTCHES TOWARDS THELOWER STEM. WORDS “THIS END UP”TOWARDS THE UPPER STEM.

9. Unscrew one Hose Nozzle Cap slightly tobleed air. Open Hydrant fully. Tighten theHose Nozzle Cap when water starts flowingand check all gaskets for leaks. TurnOperating Nut to fully CLOSED position andremove Hose Nozzle Cap to allow Barrel todrain. Replace Hose Nozzle Cap.

10. Turn Operating Nut in the closingdirection to assure Main Valve is closedtightly, then turn in opening direction1/4 turn to relieve tension on operat -ing mechanism.

CAUTION: Always fill the oil reservoir with the Bonnet installed, the hydrant in its normal upright position, and the main valve fully closed. Ifthe hydrant is filled with lubricant under any other circumstances, excess lubricant can overfill the reservoir and create a pressure lock. This couldresult in damage to the seals or Bonnet, or prevent proper hydrant operation.

*Tighten Hold Down Nut to 200-300ft-lbs of torque. If torque wrench isnot available, use a 3 lb. hammer tostrike the end of the A-311 wrenchfirmly two times to assure the nut isproperly tightened.

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MMUUEELLLLEERR®® MMOODDEERRNN CCEENNTTUURRIIOONN®® FFIIRREE HHYYDDRRAANNTTReplacing Safety Flange and Safety Stem Coupling

1. Mueller Hydrant with Upper Barrel knockedover by vehicle. NNoottee:: broken pieces of SafetyFlange lying on ground.

2. Remove Stainless Steel Cotter Pin fromStainless Steel Clevis Pin. Remove the Clevis Pinand damaged Safety Stem Coupling from UpperStem. Unbolt and remove broken Safety Flangefrom Upper Barrel. Remove Weather Cap, HoldDown Nut, Anti-Friction Washer and OperatingNut from Upper Barrel. Lubricate Brass Sleeveand slide over threaded Stem end to prevent O-ring damage. Unbolt and remove Housing.Remove Upper Stem from Housing.

3. Remove Stainless Steel Cotter Pin fromStainless Steel Clevis Pin in Lower Stem andthrow these pieces away.

4. Assemble new Safety Stem Coupling to UpperStem with new Stainless Steel Clevis Pin andCotter Pin. Safety Stem Coupling should beinstalled with notches towards the Lower Stem.NNOOTTEE: “THIS END UP” stamped on Coupling.

5. Assemble Upper Stem and new Safety StemCoupling onto Lower Stem and retain with newStainless Steel Clevis Pin and new Cotter Pinfurnished with Safety Stem Coupling.

6. Place Flange Gasket on exposed Flange ofLower Barrel. Place Upper Barrel carefully inposition on Lower Barrel. Be sure that it isconcentric with Lower Barrel and that Gasket iscentered. Bolt into place the two halves of SafetyFlange (with bevel on outer edge downward)and with Safety Flange snugly fitting aroundLower Barrel.

7. Attach the Brass Sleeve to Upper Stem andlubricate outside to protect O-rings from threaddamage. Place Housing onto Upper Barrel andtighten Bolts. Remove Brass Sleeve, reassembleOperating Nut, Anti-Friction Washer and HoldDown Nut.* Be sure O-ring Seals are in goodcondition at thread shoulder on outside of HoldDown Nut and on inside where contact is madewith Operating Nut.

8. Remove the Oil Filler Plug in Housing. PourMUELLER Hydrant Lubricating Oil into oilreservoir until it is level with Oil Filler Plug hole.Replace Oil Filler Plug and Weather Cap.

9. Unscrew one Hose Nozzle Cap slightly tobleed air. Open Hydrant fully. Tighten the HoseNozzle Cap when water starts flowing andcheck all gaskets for leaks. Turn Operating Nut tofully closed position and remove Hose NozzleCap to allow Barrel to drain. Replace HoseNozzle Cap.

10. Turn Operating Nut in the closing directionto assure Main Valve is closed tightly, then turnin opening direction 1/4 turn to relieve tensionon operating mechanism.

CAUTION: Always fill the oil reservoir with the Bonnet installed, the hydrant in its normal upright position, and the main valve fully closed. If the hydrant isfilled with lubricant under any other circumstances, excess lubricant can overfill the reservoir and create a pressure lock. This could result in damage to theseals or Bonnet, or prevent proper hydrant operation.

*Tighten Hold Down Nut to 200-300ft-lbs of torque. If torque wrench is notavailable, use a 3 lb. hammer to strikethe end of the A-311 wrench firmlytwo times to assure the nut is properlytightened.