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Thread: M275 air pack issues.

  1. #1
    3 Star General MuleMac01's Avatar
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    Exclamation M275 air pack issues.

    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 by MuleMac01; 11-08-2018 at 00:04.
    1951 Reo M275 Gas tractor
    1964 BMY M274A2 mule
    1986 Cucv M1028a1
    1986 cucv m1009....... sold.......
    1991 M923A2 5-Ton cargo truck
    ----- M101A3 Trailer
    ----- M105A2 Trailer
    2007 M105A3 Trailer
    1983 M118A1 6 ton Semi trailer flat bed
    MVPA# 36599

  2. #2
    3 Star General MuleMac01's Avatar
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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.
    1951 Reo M275 Gas tractor
    1964 BMY M274A2 mule
    1986 Cucv M1028a1
    1986 cucv m1009....... sold.......
    1991 M923A2 5-Ton cargo truck
    ----- M101A3 Trailer
    ----- M105A2 Trailer
    2007 M105A3 Trailer
    1983 M118A1 6 ton Semi trailer flat bed
    MVPA# 36599

  3. #3
    4 Star General SETOYOTA's Avatar
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    What did you figure out?
    Have owned A whole bunch of jeeps, trucks and armor. Still have a few.

    I love my carbon footprint and no I don't own a Toyota.

  4. #4
    3 Star General MuleMac01's Avatar
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    My trolly vale ( air hand brake) plunger is stuck and is back feeding into the system but i will know more tomorrow.
    1951 Reo M275 Gas tractor
    1964 BMY M274A2 mule
    1986 Cucv M1028a1
    1986 cucv m1009....... sold.......
    1991 M923A2 5-Ton cargo truck
    ----- M101A3 Trailer
    ----- M105A2 Trailer
    2007 M105A3 Trailer
    1983 M118A1 6 ton Semi trailer flat bed
    MVPA# 36599

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    There is a "two way" valve on the frame that could be stuck.

  6. #6
    3 Star General MuleMac01's Avatar
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    Quote Originally Posted by rustystud View Post
    There is a "two way" valve on the frame that could be stuck.
    Bingo that was stuck solid we found that out and cleaned and repaired it now everything works.

    20181109_155820.jpg
    1951 Reo M275 Gas tractor
    1964 BMY M274A2 mule
    1986 Cucv M1028a1
    1986 cucv m1009....... sold.......
    1991 M923A2 5-Ton cargo truck
    ----- M101A3 Trailer
    ----- M105A2 Trailer
    2007 M105A3 Trailer
    1983 M118A1 6 ton Semi trailer flat bed
    MVPA# 36599

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    Tracer (11-09-2018)

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    4 Star General NDT's Avatar
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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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    Quote Originally Posted by MuleMac01 View Post
    Bingo that was stuck solid we found that out and cleaned and repaired it now everything works.

    20181109_155820.jpg
    Glad to help.

  10. #9
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    Quote Originally Posted by MuleMac01 View Post
    Bingo that was stuck solid we found that out and cleaned and repaired it now everything works.

    20181109_155820.jpg
    is that valve located under the walkway ? between the frame where the trailer air lines are hooked up when not in use ?
    m416 cargo trailer 2*
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    m116 trailer
    Chevy blazer s10 1988
    bombardier iltis 1983
    jeep m38a1 (cj5M) 1961
    Reo m275 1968

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