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Thread: Initial shake down trip of a new-to-me XM818

  1. #11
    Former SSG 98G's Avatar
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    And so it continues....

    Yesterday I drove it from Hannibal MO to Washington KS.

    Today I'm doing the last minute loading and hooking up to the M129A4 and departing for AZ, with a stop in Guymon OK to meet up with 155MM and a stop in Socorro NM to work on a buddy's M923.

    It's hot.... can't wait to get to the desert where at least a wet towel is adequate cooling. Here in KS a wet towel is just a hot wet towel. 115* in Cave Creek isn't as bad as 90* here.


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    Last edited by 98G; 08-10-2019 at 21:59.

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  3. #12
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    Quote Originally Posted by 98G View Post
    And so it continues....

    Yesterday I drove it from Hannibal MO to Washington KS.

    Today I'm doing the last minute loading and hooking up to the M129A4 and departing for AZ, with a stop in Guymon OK to meet up with 155MM and a stop in Socorro NM to work on a buddy's M923.

    It's hot.... can't wait to get to the desert where at least a wet towel is adequate cooling. Here in KS a wet towel is just a hot wet towel. 115* in Cave Creek isn't as bad as 90* here.


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    20190810_171255.jpg
    I spotted you on I70 when you were almost to Salina. Looked Awesome!
    Andrew
    Andrew

    1952 m38a1
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    And a bunch of Humvee parts.......

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  5. #13
    Former SSG 98G's Avatar
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    Despite having gone through it thoroughly in June and paying special attention to the brakes, I lost the brakes entirely, entirely without warning. Pedal to the floor, no response.

    No crash. No damage. No injuries. Downshifting got me slow enough that my newly installed park brake stopped it.

    Bleeding the brakes restored pedal and apparently restored full functionality. I didn't get any noticeable amount of air out of any of the bleeders.

    Obviously this is a bandaid fix on a symptom of a more subtle problem. I'm stopped in Socorro NM until it has been resolved to my satisfaction. I dont yet understand what happened and "anything that you dont understand is dangerous until you do".

    My suspicion is the air pack. I'll be disassembling it for inspection and rebuilding/replacing as appropriate.

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  7. #14
    Corporal
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    Default Initial shake down trip of a new-to-me XM818

    Someone more experienced please correct me if I am wrong.
    From what I understand of the M809 series brake system “no pedal” (pedal goes to the floor) will be air in the system somewhere, brake fluid escaping somewhere, or master cylinder problems. The air pack just provides “boost,” even with zero air pressure you still have “pedal” and brakes if you press the pedal hard enough with both feet.


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  8. #15
    Former SSG 98G's Avatar
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    Quote Originally Posted by Lovetofix View Post
    Someone more experienced please correct me if I am wrong.
    From what I understand of the M809 series brake system “no pedal” (pedal goes to the floor) will be air in the system somewhere, brake fluid escaping somewhere, or master cylinder problems. The air pack just provides “boost,” even with zero air pressure you still have “pedal” and brakes if you press the pedal hard enough with both feet.


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    I concur.

    The air pack provides a place for fluid to escape, and a source from which air can enter. Unless I'm missing something (which is entirely possible)

  9. #16
    Colonel wrenchturner6238's Avatar
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    I see this combo entering in to Liberal Ks on 54 hwy and I was wandering who it was guess I now know. Looked like you were getting along pretty well. 155MM is good guy and a nice m916

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    Post 10: add M915 which also have a 48" fifth wheel instead of 60" like a M818 etc.

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    If you're coming up I25 towards ABQ and need anything let me know.
    1989 M923

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