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  1. #1
    Bronze Member
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    Nov 2008
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    Default Allis Chalmers 6140 - questions

    I noticed you guys do not have an Allis Chalmers section, any reason why? I thought they were pretty big? Either way, I am looking at taking over an Allis Chalmers from my Dad's friend. It is an 80ish AC 6140, and he claims it to be a 4 cyl 40 horse. I am not sure its value really, but the hourmeter appears to be non functional and stopped at 1800 hours. Couple other issues I have spotted is that the pivoting point on the front axle for the steer is wore down and the wheels shimmy badly when driving down the road. Also, the 3 point hitch is questionable. Now weve played with it and it seems after a while to raise easier in lower rpm's then high. Also when you put it in high rpm's to raise it the shrill from under the seat area is unbearable. It will raise, hold for a bit make a loud shrill, then start raising 15 seconds later, hold for a bit loud shrill, then finish raising. Now in lower rpm's after a while it will raise and lower no problems and the shrill is minimal if even existant. My dad says it sounds like bypass valve in the hydraulic system but I honestly have no clue and have yet to take it to a mechanic. What do the masters on forum know about this if anything?

  2. #2
    Bronze Member
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    Default Re: Allis Chalmers 6140 - questions

    no one can shed any light on this?

  3. #3
    Platinum Member nspec's Avatar
    Join Date
    Dec 2007
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    619
    Location
    Southern Rhode Island
    Tractor
    Kubota B2630, '53 Farmall Super H, '47 Farmall AI, '44 Farmall A

    Default Re: Allis Chalmers 6140 - questions

    I hopped over here from you're link in the Ford post. We had an Allis 6080 in the early 80's which was a very good, basic tractor - no frills, though there really weren't many than anyway. That tractor was 70ish hp. Anyway, have you checked the hydraulic fluid level? Sounds like maybe it's low.

  4. #4
    Bronze Member
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    Nov 2008
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    Default Re: Allis Chalmers 6140 - questions

    it is full. its a real high pitched noise.

  5. #5
    Veteran Member
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    Apr 2000
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    1,639
    Location
    Dixon, Il
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    ford 9700, tw30, massey, jd2030 jd4010, yanmar F60d, ym330d, ym276d,ym226d,ym186d, ym2000, ym155

    Default Re: Allis Chalmers 6140 - questions

    Sounds like a faulty relief valve.

  6. #6
    Bronze Member
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    Nov 2008
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    Default Re: Allis Chalmers 6140 - questions

    Quote Originally Posted by lens12 View Post
    Sounds like a faulty relief valve.
    i am still consdering getting this tractor.. my dad said he thought it was a releif valve also.. sounds like it makes sense.. any idea what it would take to fix that on a tractor like this?

  7. #7
    Veteran Member
    Join Date
    Apr 2000
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    1,639
    Location
    Dixon, Il
    Tractor
    ford 9700, tw30, massey, jd2030 jd4010, yanmar F60d, ym330d, ym276d,ym226d,ym186d, ym2000, ym155

    Default Re: Allis Chalmers 6140 - questions

    It could be dirt or a spring & ball.

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