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Case 1150b dozer

Discussion in 'Dozers' started by miller125, Jun 24, 2019.

  1. miller125

    miller125 Member

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    I have 1150b that will lose pressure after about 1 hour checked all line for leaks
    Put a mechanical pressure gauge in place of the dash mount one It will hold 260 ish
    When in gear (hot) it drops to 0 when shifting from fwd to rev or lo to high My question is the moderator valve I have the old style with sims I think it’s weak cause you can pat fuel and pressure instantly jumps to 260 so do I have to have case’s special weight to check it.





    I have read all posts on here guys are very Knowledge thanks
     
  2. Coy Lancaster

    Coy Lancaster Senior Member

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    You can shim it up by trial and error. You also may want to check the transmission pump.
     
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  3. Vetech63

    Vetech63 Senior Member

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    I believe there is a transmission suction strainer on those. It rarely gets cleaned or replaced because it isn’t easy to get to. You will need to remove the belly pan under the driveshaft to access it easily.
     
  4. miller125

    miller125 Member

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    Sorry guys all filters new and clean with fluid and new charge pump the old had wear. Trying to bring old machine to life it sit for 9 years
     
  5. Coy Lancaster

    Coy Lancaster Senior Member

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    If you have a Case dealer close by take your modulator valve in to them so they can set it. Hopefully they won't charge you an arm and a leg.
     
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  6. Vetech63

    Vetech63 Senior Member

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    I believe it’s your first born now.;)
     
  7. Coy Lancaster

    Coy Lancaster Senior Member

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    Yeah probably so
     
  8. miller125

    miller125 Member

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    Well I took the moderator valve out and took it apart to check it and the actuator spring measured 2 7/16 free spec. is 2.62
    And the poppet spring was 1 7/16 free and spec. 1.50 do guys think this is causing my zero pressure when hot When shifting from fwd to reverse and pressure returns to normal when you pat the fuel
    Leading to think that the spring pressure is not there to seat in spool properly
    Correct me if my thinking is wrong
     
  9. Vetech63

    Vetech63 Senior Member

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    You should check your pump.
     
  10. miller125

    miller125 Member

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    Pump is new
     
  11. Vetech63

    Vetech63 Senior Member

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    Sorry,I missed that. If I remember right you have that huge stacked transmission control valve bolted to the top of the transmission. I had an 1150 doing something similar from a small piece of a control valve gasket that had blown out,
     
  12. miller125

    miller125 Member

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    So would you replace those springs or not
     
  13. Vetech63

    Vetech63 Senior Member

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    I wouldn’t myself. By increasing your throttle you are increasing oil flow to the point that the flow is overcoming the leak in the system. When I have those kind of issues I usually remove the control valve and reseal it. Those gaskets get brittle over time and will start breaking up between ports and valleys that they are meant to keep sealed. I would remove the valve, clean it and reseal it.
     
  14. miller125

    miller125 Member

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    Ok thank you for help
     
  15. Volvomad

    Volvomad Well-Known Member

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    Not familiar with the valves on this but if the pressure jumps up as opposed to slowley rising with increasing with engine speed it would sound to me (and probably me only ) like a slightly scored valve or bore that only sticks when hot .
    How hot ?
     
    guest likes this.
  16. miller125

    miller125 Member

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    5537D8AC-673D-4F9C-9273-0374A5D1B086.jpeg 0754AE02-60E3-4552-ABE4-CF5BABF9347C.jpeg 67CDDAE2-3B89-4776-AF62-5BEA483DC1F3.jpeg Hey Vetech63 I think you were right about the controller gasket it had a piece of gasket missing The funnel screen in the gauge line was very poor shape does it need to be replaced or can it be ran without it I have not got to test it yet just got back together I will keep you posted
    Thank a for the help
     
  17. Vetech63

    Vetech63 Senior Member

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    I always keep screens in place if they are reusable or available for replacement. Hopefully the rebuild will fix your issue. If not, come back and let us know. Make dam sure those parts are super clean when you go back together, especially where the old gasket is stuck to the metal.
     
    mg2361 likes this.
  18. miller125

    miller125 Member

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    Well finally got the gasket replaced and I think it fix the 0 to 200 psi jump when going to fwd to reverse but only get 160 psi high range and 260 ish on the low range Do you guys think it could be shaft rings on the transmission on the back
    Thanks for the help
     
  19. Coy Lancaster

    Coy Lancaster Senior Member

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    Check your seal rings on your lower shaft
     
  20. miller125

    miller125 Member

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    F376DA30-C5D0-407A-A234-D95905651E3D.jpeg 4DBF30F0-321B-4E0F-9221-1C8F9BE12EAE.jpeg Well I pulled the rev and forward on the back of transmission to check the three oil ring they are good but the case show wear in the closest ring to the transmission ( picture farthest one in)could that be where I am lose high range pressure