M275 air pack issues.

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MuleMac01

Young buck looking for information.
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Hey guys my 1951 m275 is giving me issues. Air is venting out of the air pavk when you step on the brake pedel and hold it there. Now I had a new old air pack so i went ahead and installed that. But this issue happened and thought it needed to be rebuilt so i got a brand new air pack new in plastic and installed that one with the same thing happening..any thoughts?

Things we tried
Opening the service brake side to see if air comes out when brake is applied. It did.

Tested trolley valve on steering wheel air comes into valve but when valve is engaged no air goes out or is vented. So we are going to rebuild that tomorrow

Could this be a issue with valve looking thing on the frame cross member under the deck plate where the air stop light switch is attached to? Maybe air back feeding into system when brake is engaged?

What do you guys think?

I need to figure this out by Friday if I'm going to have the truck ready for veterans day.
 
Last edited:

MuleMac01

Young buck looking for information.
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Huh no replys on this help question within 24 hours, guess I have you guys Stumped like me, but I think I might of found the problem.
 

MuleMac01

Young buck looking for information.
Steel Soldiers Supporter
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28
Location
Las Vegas Nevada
My trolly vale ( air hand brake) plunger is stuck and is back feeding into the system but i will know more tomorrow.
 

NDT

Well-known member
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While you have it apart, consider retrofitting a tractor protection valve down there. I put one on my A2.
 
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