Mueller Improved BONNET PARTS


Chattanooga - IMPROVED Series BONNET PARTS and KITS

	Updated 01/26/2009

		This page includes the following information: Bonnet Design Upgrades Bonnet Parts and Kits Bonnet Repair Tools Bonnet Maintenance [Link]


	Chattanooga IMPROVED series Bonnet Designs

		Certain parts of these hydrants changed over time. When replacing old parts you should look at the bonnet design for the year that your hydrant was manufactured and the changes since that time. This will make it much easier to order the correct current part design offered.


	1934 - 1947 Improved Bonnet Design Bonnet had conventional packing with a stuffing box and gland. Nozzle chains were attached to H63 Eye Bolt. Prior to 1934 the this hydrant was owned and marketed as the "Columbian", owned by the Columbian Iron Works Company which Mueller purchased during 1933. Some Parts Available ***

1948 Oil Reservoir Design Begins

The former stuffing box and packing design has be discontinued and replaced by a built in liquid oiling system. A "Oil Reservoir" holds the bonnet oil. Self-Oiling of all necessary points of lubrication done each time the Mueller Chattanooga IMPROVED series is completely cycled.

Improved hydrants built 1948 to 1962 have a separate - internal cast iron piece under the Bonnet. Referred as H61 Stuffing Box casting "open type", this casting contains a reservoir cup which holds the bonnet oil (blue color). These "open type" designs act like a cup full of liquid with no lid, tip or hit the cup and the liquid sloshes out of the cup.


	1948 - 1953 Improved Bonnet Design The first self-oiling reservoir (open type). Weather Cap added to operating nut. O-ring seals and oil have now replaced the old stuffing box. No oil filler plug. Nozzle chains attached below each nozzle. Some Parts Available ***


	1954 - 1961 Improved Bonnet Design Self-oiling reservoir (open type) has been enlarged. Oil filler plug has been added - mounted in the straight vertical position. Some Parts Available ***


	Typical Bonnet head. (4) bonnet bolts/nuts hold down the casting. Once removed the oil reservoir (stuffing box) casting is visible being held down by (4)-stuffing box bolts/nuts. Originally supplied with a bronze material weather cap.


		*** Older Cast Parts Are Subject To Availability. Call or e-mail our office


	1962 - 1965 Improved Bonnet Design The oil reservoir and bonnet casting design was changed. No longer a open-type, the new Sealed Oil Reservoir design is identified with a "SR" casting on top of the bonnet flange. Oil filler plug is now set on an angle. Most Parts Available as listed below.






		The sealed reservoir design changes the exterior features. The bonnet assembly is held down by (8) bolts/nuts.

	The new "SR" design oil reservoir is part of the bonnet casting and lifts off the upper stem in one piece.


		1962 - 1965


		Original "SR" BONNET DESIGN with parts and locations detailed. This is referenced for changes made later.

H101 Hold down nut O-Ring

H-100 Bonnet O-Ring. This design had the O-Ring located within a machined "groove" in the bonnet casting.

	Bonnet casting

Old-style Hold down nut.

1966 - 1972 Improved Bonnet Design
Part H-102 Steel Lock Washer was added. This washer prevents the Hold Down Nut from backing out as the hydrant is operated. It is installed between the bonnet and the hold down nut. Two Lock Washers are available, one for hydrants that open Left and one for hydrants that open Right.

The incorporation of this washer necessitates changes in the Hold Down Nut and Weather Cap. The former designs of these two parts are unavailable, only new style parts can be furnished. This new design Weather Cap, now 4-1/8" wide, is not as wide as the former but it will fit both old and new style hydrants. However, if ordering a new Hold Down Nut, it is necessary to also purchase the new Weather Cap. The old cap will not fit the new hold down nut recess which is not as wide as the former. The Lock Washer is required to be ordered as well.


	1966 - 1972


	Recess area (where bottom of Weather Cap casting fits into) has been narrowed. Older weather caps will NOT fit.

	H101 Hold down nut O-Ring

	Lock Washer H102 added

	H-100 Bonnet O-Ring. This design had the O-Ring located within a machined "groove" in the bonnet casting.

	Bonnet casting

	1966 - style Hold down nut.


	Indicates a change from the prior design

1973 - 1980 Improved Bonnet Design
The Bonnet casting and Hold Down Nut were redesigned. This design change consisted of changing from a O-Ring recess/groove in the Bonnet casting to a O-Ring groove in the Hold Down Nut and changing the machining on the inside of the Bonnet top from a counterbore with a small chamfer to a tapered counterbore.

The new design Hold Down Nut will fit an pre-1973 style Bonnet only if the H-102 Lock Washer is ordered and installed.


	1973 to End


	Recess area (where bottom of Weather Cap casting fits into) was narrowed. Pre-1966 weather caps will NOT fit.

	H101 Hold down nut O-Ring

	Lock Washer H102

	H-100 Bonnet O-Ring. This design has the O-Ring located within a machined "groove" in the Hold Down Nut. The size of the O-Ring did not change.

	Bonnet casting revised, per above.

	1973 - style Hold down nut with machined "groove" for bonnet O-Ring location change.


	Indicates a change from the prior listed design


	BONNET PARTS Chattanooga IMPROVED (150 PSI)..MFG: 1962 – End of 1980 Has a weather cap and operating nut is threaded for weather cap Main Valve Opening Sizes Produced: 4-1/4", 4-1/2", 5-1/4", 6-1/4"

NOTE**



	Please specify the Size and Shape of the Wrench Nut when ordering. National Standard size and shape is 1 1/2" Pentagon, measured from point to opposite flat. WHEN ORDERING: L&C supplies the Standard 1-1/2" Pentagon Size unless otherwise noted. Square, Hexagon, or other types can also be furnished.

SUGGESTED BONNET PARTS ORDERING...
for 1972 or OLDER Chattanooga IMPROVED series


	As listed above, there has been changes in some Improved series bonnet parts. If you are dismantling a 1972 or older Improved bonnet, the following parts should be ordered. These parts will upgrade obsolete parts to the 1973 and newer design listed above.


	1

	2

	3


	H-53 Hold Down Nut with machined "groove" for bonnet O-Ring location change. If replacing in a pre-1966 hydrant, also order a matching H-52 Weather Cap.


	H-102 Lock Washer


	A Bonnet rebuild kit contains all gaskets and O-rings required for Mueller Improved series hydrants.

		Parts marked with * are included in a Mueller BONNET REBUILD KIT

Ill #	Description	LC №	Price Each
H-51**	Operating Nut Open LEFT	133000	174.46	QTY:
H-51**	Operating Nut Open RIGHT	133001	174.46	QTY:
H-52	Weather Cap Open LEFT Fits All VO sizes 4-1/8" width	133008	27.93	QTY:
H-52	Weather Cap Open RIGHT Fits All VO sizes 4-1/8" width	133010	27.93	QTY:
H-101*	Hold Down Nut "O" Ring Fits All VO sizes	133017	6.89	QTY:
H-53	Hold Down Nut Open LEFT Fits 4-1/4", 4-1/2", and 5-1/4"	133016	55.42	QTY:
	Hold Down Nut Open RIGHT Fits 4-1/4", 4-1/2", and 5-1/4"	133018	55.42	QTY:
	Hold Down Nut 6¼ VO ONLY	discontinued
H-100*	Bonnet "O" Ring. Fits All VO sizes	133262	6.89	QTY:
H-102	Lock Washer. Fits All VO sizes Open LEFT	133266	12.54	QTY:
H-102	Lock Washer. Fits All VO sizes Open RIGHT	133268	12.54	QTY:
H-59*	Bonnet Gasket 4-1/4" and 4-1/2" VO ONLY	133034	14.70	QTY:
H-59*	Bonnet Gasket 5-1/4" VO ONLY	133036	14.70	QTY:
H-59	Bonnet Gasket 6-1/4 VO ONLY	133038	15.26	QTY:
H-93*	Stem "O" Ring, Fits All VO sizes 2 - REQUIRED	133246	6.87	QTY:
H-74	Upper Stem (for old 3-Piece Brass threaded)	See Below For Listings
H-103	Upper Stem (for 1-piece Steel Break Coupling)	See Below For Listings


	NOTE* These parts are included in a Mueller BONNET REBUILD KIT See below or click here




	OIL for Mueller Bonnets

Ill. #	Description	LC №	Price Each	Order
A-51S*	Bonnet Oil 10.5 Oz Container	131170	14.75	QTY:
A-51P	12-Pack of above 10.5 Oz size	131171	184.15	QTY:
A-51G	Bonnet Oil Gallon Container	131172	39.02	QTY:


	NOTE* This part is included in the Mueller BONNET REBUILD KIT See below or click here


	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.




	UPPER STEMS For IMPROVED Series H-74 and H-103


	Break Coupling design prior to 1972 consisted of a 2-piece Brass Coupling that interlocked and held in place with a set screw. During the production year 1972 the break coupling was changed to a 1-piece Steel coupling with clevis and cotter pins. This change in break coupling design reflected a change in the Upper and Lower Stem build. If ordering a replacement Upper Stem for the IMPROVED series, make sure you are ordering the correct version parts.

		BRASS COUPLING DESIGN


		H-74


	STEM H74 is threaded for former 2-piece brass coupling design


	The Break Coupling Parts required that mate up the Upper to Lower Stems can be found below.


	Brass Coupling PARTS

	Brass Coupling in KIT


	H-74

4-1/4" and 4-1/2" VO Size
Mfg. Years	Overall Length	Opening Direction	LC №	Price	Order
1932—1971	28 3/8"	LEFTΔ	133090	161.60	QTY:
1932—1971	28 3/8"	RIGHTΔ	133092	161.60	QTY:

5-1/4" VO Size
Mfg. Years	Overall Length	Opening Direction	LC №	Price	Order
1932—1971	31 5/8"	LEFTΔ	133098	161.60	QTY:
1932—1971	31 5/8"	RIGHTΔ	133100	161.60	QTY:

6-1/4" VO Size
Mfg. Years	Overall Length	Opening Direction	LC №	Price	Order
1932—1971		LEFTΔ	133102	180.51	QTY:
1932—1971		RIGHTΔ	133104	180.51	QTY:


	STAINLESS STEEL COUPLING DESIGN


	H-103

	STEM H103 has a solid end with Hole Drilled for newer 1-piece STEEL coupling design


	The Break Coupling Parts required that mate up the Upper to Lower Stems can be found below.


	Steel Coupling PARTS

	Steel Coupling in KIT


	H-103

4-1/4" and 4-1/2" VO Size
Mfg. Years	Overall Length	Opening Direction	LC №	Price	Order
1972—1980	30 1/16"	LEFTΔ	133270	161.60	QTY:
1972—1980	30 1/16"	RIGHTΔ	133272	161.60	QTY:

5-1/4" VO Size
Mfg. Years	Overall Length	Opening Direction	LC №	Price	Order
1972—1980	33 5/16"	LEFTΔ	133274	161.60	QTY:
1972—1980	33 5/16"	RIGHTΔ	133276	161.60	QTY:

6-1/4" VO Size
Mfg. Years	Overall Length	Opening Direction	LC №	Price	Order
1972—1980		LEFTΔ	133278	180.62	QTY:
1972—1980		RIGHTΔ	133280	180.62	QTY:




		Special Ordering Item Details


	Certain items require more specific details be noted for your order to be can be entered. Listed Below Are Item Details Required.




	Δ Direction Of Opening

		Δ When ordering any internal part, it is based on how the hydrant opens and NOT by the way any individual part installs or how it UN-installs from the hydrant.

ORDERING NOTES FOR PARTS ORDERING

Some parts require the Direction Of Opening to be stated.

OPEN, followed by a directional arrow indicates either a Left or Right to open water flow from hydrant


	Open LEFT Counter clockwise

		Open RIGHT Clockwise


Bonnet Build Code SR, ASR, or BSR

	Operating Nut Types The SHAPE and SIZE of the Operating Nut must be know for certain parts. The wrench nut ends of the hydrant nozzle CAPS should have the same Shape and Size as the Operating Nut.


	Mueller BONNET REBUILD KITS Chatta.- IMPROVED


	Each Bonnet rebuild Kit contains all gaskets and O-rings required for Mueller Improved series hydrants.


	Parts may be left over from this kit when repair is finished. For selected parts in this kit, more pieces are included than will be needed to refurbish the hydrant. These spare pieces are provided in case one of the selected parts is damaged or lost while working on the hydrant


	4-1/4", 4-1/2" Valve Opening Size BONNET SEAL KIT

Description

LC №

Each

Order

Contains The Following Items illustrated in color above:
(1)-H59, (3)-H93, (2)-H100, (2)-H101, and (1)- 10.5 oz Can Mueller Bonnet Oil

133446

$ 56.53




	5-1/4" Valve Opening Size BONNET SEAL KIT

Description

LC №

Each

Order

Contains The Following Items illustrated in color above:
(1)-H59 , (3)-H93 , (2)-H100 (2)-H101 , and (1)- 10.5 oz Can Mueller Bonnet Oil

133447

$ 56.53


	SPECIAL TOOLS Required For IMPROVED BONNET Rebuilding


	For Chattanooga - IMPROVED series Bonnet repairs, the following special tools are recommended. Their use is illustrated on our Improved Bonnet Maintenance procedures page. The link is listed below.


	Hydrant Head Maintenance WRENCH




		The large end is used to remove and install the Hold Down Nut [in red] from all Mueller Hydrants.


	The middle of the wrench removes the weather cap and operates both rocker and pin lug adapters that are attached to the nozzles.


	The Small end is called a Wrench Nut. The wrench nut ends of the hydrant nozzle CAPS should have the same Shape and Size as the Operating Nut.

NOTE**



	Please specify the Size and Shape of the Wrench Nut when ordering. National Standard size and shape is 1 1/2" Pentagon, measured from point to opposite flat. When ordering, L&C supplies the Standard 1-1/2" Pentagon Size unless otherwise noted. Square, Hexagon, or other types can also be furnished.

Description

LC №

Each

Order

Mueller Hydrant Head Maintenance Wrench

131173

$ 29.41


	BRASS SLEEVE for bonnet removal

The bonnet removal Brass Sleeve is used to protect the Bonnet O-rings and stem threads from being damaged when removing and/or replacing the Bonnet Assembly back onto the upper barrel. For Centurion and Improved design dry-top hydrants. The sleeve is 14" long and includes a detent inside of sleeve. This detent makes the sleeve a threaded On and Off design.
This holds the Brass Sleeve onto the stem threads while you are removing and reinstalling the bonnet.

Description

LC №

Each

Order

14" Brass Sleeve with Detent for Mueller Bonnet repairs

131177

$ 68.00


	The sleeve is 11" long. For Centurion and Improved design dry-top hydrants. No detent inside of sleeve.

Description

LC №

Each

Order

11" Brass Sleeve for Mueller Bonnet repairs

131175

$ 38.50

Maintenance Procedures






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