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Jarrad

Identifying a Wagner air service chamber from a B615

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Can you help me identify this chamber?   It has no markings on it.  It was removed from the rear of 1965 Mack b615.  I have two on the truck that need to be fixed.  

Next question is, do I rebuild them or replace them?  

Thanks for the help!

20191108_134756[1].jpg

20191108_134808[2].jpg

20191108_134828[1].jpg

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19QE3101P5 Chamber 

202SK15 KIT

375SK17 SHELL that one I have to double check, scary the numbers I remember. 

 

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Believe they call them rotochambers, and very expensive I believe. most guys change them to a conventional brake can.    terry:MackLogo:

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1 hour ago, terry said:

Believe they call them rotochambers, and very expensive I believe. most guys change them to a conventional brake can.    terry:MackLogo:

The rotochambers I've seen are in the $600 to $900 range. I'll have to figure something out on my truck because my old ones are rusted badly. They mount between the frame rail and tire so too snug for most chambers. Rob is switching his to a smaller chamber, a 16 or 24 I believe.

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That is a Wagner "Power Amplfier" brake chamber. Not really worth working with citing cost. They are a series of sealing rings internally but the inner bore of the shell is a working part and corrodes. New sealing rings do not hold up long and the aluminum piston the rings seal to this bore scar through usage. They are 20 cubic inch rated as are the Bendix "Rotochamber" used on the B series Mack trucks, (up to about 40K rated suspensions). Both of these types brake chambers are much better served with modern replacement by Type "20" service chambers. Most anything but the 34K, (SWDL56) rear suspension in a B series will take larger, (Type 24/24) spring and service chamber brake cans, but the setup with aluminum brake spiders is limited to Type 20 per space constraints. One could fabricate offset mounts and use offset slack adjusters to install larger chambers, but until I read where that is legal to do, I'll stick with what I know will pass inspection. Far too many $$$ at stake and an enforcement officer's discretion of how many of those you are going to be pried free of to be questionable. 

On steer axle most tractors, and tandem trucks, "most" used Type 16, with single axle trucks using type 12 service chambers. That is no hard and fast rule, just what I've seen through the years of working with them.

The above mentioned only relates to the B series.

Rob

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Can you fill me in on the TYPE 20 Chambers.  

I did pull my chamber apart and found just like you said.  Seal Wagner # AD29-56 and a rusted/corroded cylinder.  I did find the $235 rebuild kit online.

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Here is a link to Haldex chambers and an explanation of them:  https://www.haldex.com/en/na/actuators/service-chamber-brakes-t09-through-t20/

These things are available all over the places and prices go from very inexpensive to exorbitant so shop around. If the truck is going to be used try to purchase something that is epoxy or powder coated to hold up to the effects of heat and corrosion. If a show truck or non working type you can use basically about anything out there. 

I have personally changed several chambers rusted through on working trucks that were the yellow cadmium plated and are available all over the internet.

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Ok Great!  One last question, for now.  How do you know when it is a push type of cylinder compared to a pull type?

J

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Push = compressed air

Pull = vacuum = larger hoses n plumb n

cya

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You won't have vacuum chambers at the wheel ends. Either pressure chambers, (push type) or hydraulic wheel cylinders.

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