Centurion Bonnets


	Centurion® Super Centurion-200® Super Centurion-250®

Removing Bonnet From Mueller Centurion Hydrants


	If you have ordered any Mueller boxed Repair KIT or Hydrant Extension from L&C, included are detailed instructions for installing the Parts KIT ordered. Most Kits include illustrations for removing old assemblies. The following LC HELP Files answer many questions that the instruction list may not easily explain.


	Removing WEATHER CAP #A-2 From Mueller Centurion-150 design Hydrants

The A-2 Weather Cap is cast iron construction and has a inside thread. This piece screws onto the A-1 brass Operating Nut which also has a mated threaded top.

The #131173 Wrench includes a cast portion that is devoted to removing/installing this part off of the operating nut. The wrench has a protruded dimple that will fit into a hole on the side of the weather cap casting.

To remove the weather cap from the A1 Operating Nut, unscrew counterclockwise


	As you can see by the picture above - left, the hydrant was repainted with the two pieces pretty much looking like a single piece. If you cannot loosen off the weather cap from the operating nut you can take a hammer and shear-off this casting [A-2] and replace it or update the top Hold Down Nut design to the current type as listed below.


	Removing HOLD DOWN NUT #A2 or #A84 From Mueller all Centurion design Hydrants

The large end of the #131173 Wrench is used for removal and install of the brass Hold Down Nut assemblies.

The large end fits over all design nuts and does not deform the brass nut when removing or installing, such as a large pipe wrench would do.

INSTRUCTIONS FOR REMOVING THE #A4 and A84 HOLD DOWN NUT
MFG YEAR 1975 ONLY
If hydrant Opens Left Turn: Remove nut by turning out Counterclockwise.
If hydrant Opens Right Turn: Remove nut by turning Clockwise.

MFG YEARS 1976 TO PRESENT:
If hydrant Opens Left Turn: Remove nut by turning out Clockwise.
If hydrant Opens Right Turn: Remove nut by turning out Counterclockwise.


	Removing BONNET CASTING From Mueller Centurion design Hydrants

Remove all of the Bolts and Nut holding down the bonnet casting to the top of the upper barrel pipe casting.

By using the #131177 14" Brass Sleeve follow the procedure as follows.

Using you can of bonnet oil, lightly film-coat the exterior of the brass sleeve. Screw On the Brass Sleeve over the threaded end of the upper stem. The sleeve has a inside "dimple" that will chaise or screw down the course upper stem threads.

Brass Sleeve now covers the sharp threads of the upper stem.
Now, remove the bonnet Bolts & Nuts.

The 2-Blue stripes illustrated within the bonnet are the A-11 stem O-Rings that the sleeve protects from being damaged by the sharp threads of the upper stem.

Remove Bonnet by sliding up and off the upper stem (protected by the Brass Sleeve)

Hydrant bonnet removed

A. If you need to replace the Break Flange COUPLING, unbolt the broken flange set and lift the upper barrel up and over the upper stem.
Note that the upper barrel can weigh 150 lb. or more
B. If your service work includes removing the lower barrel "Main Valve Assembly", the Valve Removal Wrench will set onto where the cover was bolted onto the upper barrel. The wrench fits over the upper stem "Pin".


	All Mueller Centurion series hydrants hold 10.0 oz of oil within the bonnet reservoir.

Non-Toxic formulation Oil. As the Mueller hydrant is open and closed this oil lubricates the upper stem threads and lubes the
(2) O-rings within the bonnet cap.

Bonnet oil should ONLY be added or checked with fire hydrant in normal closed position. The oil port is located on the top area of the bonnet casting. Remove the hex screw plug and Fill or top-off bonnet reservoir with Mueller oil until oil begins to drip from oil port. Bonnet holds 10.0 oz when full. A can of Mueller oil contains 10.5 oz.

Use only genuine Mueller oil for protection of O-ring seals and complete operation in a temperature range of minus -60 to plus 150 degrees.






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