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Thread: M220 AirPak rebuild.

  1. #11
    4 Star General Gunfreak25's Avatar
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    I just used a set of needle nose pliers for the snap ring that holds the check valve in place. Came right out but I forgot about the spring underneath and it all went flying into my face. Luckily missed my eye, but I'll use your method next time. I used a fine thread tight fitting metric screw to remove that vinyl washer. It came out quite easy. One question Oldfart, does the 5 ton kit have this replacement seal? The vinyl/plastic one that is.

    It's unfortunate to hear the mods gave Jolly some flak about his posts. It's called individual responsibility and we're all accountable for OUR choices in what we do to our trucks, or with our lives for that matter.
    Beer is proof that god loves us and wants us to be happy.

    1954 GMC M211 6.2/700r4/np231 repower
    1986 M1009

  2. #12
    4 Star General Oldfart's Avatar
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    Quote Originally Posted by nattieleather View Post
    Excellent pictures on how to do this. I know way back in the day I paid a good chunck of money to Memphis Equip to get a rebuilt air pack and I have the feeling all I got was an air pack that had been repainted but still worked.. My question is since you used the parts from the M54 aka 5ton truck air pack to rebuild the M211 serries air pack is it possible to just use the air pack off of a 5 ton on the M211?

    Yes, no and maybe.

    The 5 ton air pak is much longer and has additional components. There are two parts to the 5 ton rebuild kit left over after rebuilding our M220 air pak. They are a couple of rubber parts that go in the double relief valve on the end of the air can on the 5 ton air pak. Our M220 air pak does not have that valve. Not only is the air can on the 5 ton longer, the internal spring is longer as is the air piston push rod. The slave cylinder assembly on the other end of the 5 ton air pak is also longer. It would be difficult to mount the larger air pak in the same space as our M220.

    It is my opinion that one could use the 5 ton air pak and replace the air can and slave cylinder with the M200 series air pak components that make it the right length to fit. But since one would have most of the air pak apart and need to replace gaskets and some seals anyway, I think it is easier to swap the 5 ton power piston into the 200 series air pak as part of a rebuild.
    M220.......1955 GMC "Warwagon" (active duty 55 yrs)
    M37.........1953 Dodge (purchased 1963)
    M101........Purchased 1968

    Military Vehicle Collectors of Colorado (MVCC)

  3. #13
    4 Star General Oldfart's Avatar
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    Quote Originally Posted by Gunfreak25 View Post
    I just used a set of needle nose pliers for the snap ring that holds the check valve in place. Came right out but I forgot about the spring underneath and it all went flying into my face. Luckily missed my eye, but I'll use your method next time. I used a fine thread tight fitting metric screw to remove that vinyl washer. It came out quite easy. One question Oldfart, does the 5 ton kit have this replacement seal? The vinyl/plastic one that is.

    .

    No, that plastic cover is not part of the rebuild kit. It is the same in the 5 ton air Pak. I think that is what you are talking about. It is a cover so to speak above the power piston. The seal is on the other side of the power piston assembly. If you mean that seal and the rubber washer under it, they are in the kit. The air piston rod goes through the seal to push on the power piston.
    M220.......1955 GMC "Warwagon" (active duty 55 yrs)
    M37.........1953 Dodge (purchased 1963)
    M101........Purchased 1968

    Military Vehicle Collectors of Colorado (MVCC)

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    4 Star General Oldfart's Avatar
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    Quote Originally Posted by Seatyger View Post
    Awesome job Gentlemen! I wish there could have been a bit more narrative since I am a bit slow in the Lightbulb Department when figuring out the photographs LOL!

    Again, thanks for your patience and time. This has been especially helpful.
    I am glad you find the thread useful. The 5 ton (800 series) TM has a section on rebuilding the 5 ton air pak. It is fairly long and detailed with step by step instructions. It sticks in my mind that the air pak section is more than 20 pages. The instructions move you through the process in a relatively clear fashion. Except for the dual relief valve the process on the M200 series is the same as the M800 series. Since the SS resource section is down you can find prpbably find the 5ton TM on Google Books with a downloadable pdf.
    M220.......1955 GMC "Warwagon" (active duty 55 yrs)
    M37.........1953 Dodge (purchased 1963)
    M101........Purchased 1968

    Military Vehicle Collectors of Colorado (MVCC)

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    2 Star General jollyroger's Avatar
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    Quote Originally Posted by Seatyger View Post
    Awesome job Gentlemen! I wish there could have been a bit more narrative since I am a bit slow in the Lightbulb Department when figuring out the photographs LOL!

    Again, thanks for your patience and time. This has been especially helpful.
    Honestly I had several fabulous, Pulitzer prize winning naratives and every time I went to post they got ditched because I needed to log back in. So I truncated the verbage and saved the last narration in an effort just to get it posted. Sure enough that one got ditched too so I just logged back in and copied what I saved and posted. That worked, finally.

    So I know the narative leaves a lot to be desired. But I figured with the post Oldfart and I would maintain the narative with answering questions and imparting tips and techniques along the way.

    And the 800 series TM for rebuilding the AirPak is really good except for a couple of places. Like where it says remove seal using the 1/2 inch screw method. When that does not work what do you do?

    You get the mini slide hammer kit from Harbor freight and use the double hook end. My slide hammer is Snap-On but Harbor freight sells a kit just like it for $20.

    And using the pick through the bleeder hole to hold the spring down so you can install the snap ring.......I know a lot about wrenchin'......But the old man came up with that one.

    The TM just say's install snap ring. Really? thanks for the help TM. Ha Ha

    So if you guys have questions please PM us or ask.

    Oh. And none of the moderators jumped me about my posts or anything. Oldfart was refering to Magnus removing all of HIS posts from SS so as to avoid any he told me to do it that way and it did not work or it killed me liability.

    That's why "in our opinion the modification to the M220 AirPak using the M54 power piston worked well for us" is stated several times in this post. We did it and you can too. We are not saying you have to do it this way.
    MVCC member

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    4 Star General m1010plowboy's Avatar
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    Default G749 air pac rebuild

    Bump gigity

    Found this in an 'archive' search so I hope it works. For those that are servicing the G749 Air Pak this can be a helpful read. Thanks to Mr. Rogers for the original thread.

    The archive link below contains 900+ threads for the G749 trucks and is just another way to search for information.

    The Early Deuce [Archive] - Steel Soldiers::Military Vehicles Supersite

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    Gunfreak25 (05-08-2012)

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    4 Star General m1010plowboy's Avatar
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    Default G749 air hy cyl

    Good to hear Dr. Oldfart. We've got a US member on the bottom of a re-build that can use some extra help.

    http://www.steelsoldiers.com/early-d...ease-help.html

    Instead of firing up a new thread the Jolly build might help. I don't see a G749 Air pac rebuild TM but me eyes are tired.

    I see the 800 series TM mentioned and will try and make a direct 'link' to that page so it's easier to find.

  9. The Following User Says Thank You to m1010plowboy For This Useful Post:

    Oldfart (05-09-2012)

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    4 Star General Gunfreak25's Avatar
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    Here is the 800 series TM for the AIR PAK. Basically gives you every step in rebuilding the darn thing with great pictures and instruction's. Works the same for the GMC kit aside from a last step or two but it's all pretty self explanitory.

    Scroll down to page 12-12 or do a search on the PDF file "air pack".

    Direct support and general support level: 5-ton, 6X6, M809 series trucks ... - United States. Dept. of the Army, United States. Dept. of the Air Force - Google Books
    Beer is proof that god loves us and wants us to be happy.

    1954 GMC M211 6.2/700r4/np231 repower
    1986 M1009

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    m1010plowboy (05-09-2012), Oldfart (05-09-2012)

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    Private DDC2StrokePower's Avatar
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    great thread, was much help to me rebuilding mine, over the last couple days now, i been workin on rebuilding my air pak. and ive got it all back together except for the little slide valve on the top. i was wondering how easily it is supposed to move. on mine i need to use a punch and some small driving force to get it to move around. i wasnt sure if this is normal or not.

    thanks

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    4 Star General Gunfreak25's Avatar
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    You mean the little piston with the 2 seals on it? This is your control valve, one side of the piston see's air pressure and the other side see's hydraulic pressure (brake fluid). I am unsure which side is which off the top of my head. Call Brake Systems Inc in Oregon and ask for Dale. Tell Dale you rebuilt your Bendix Air Pak and need to know how hard the control valve piston should move in it's bore. Dale's been in them all, great guy with loads of info. It seems to me like the seals should be lubed with something before assembly to aid in seal life. I'm doing mine in silicone grease but that is only because I am using Dot 5 silicone brake fluid in the system.
    Beer is proof that god loves us and wants us to be happy.

    1954 GMC M211 6.2/700r4/np231 repower
    1986 M1009

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