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  1. #1
    New Member
    Join Date
    Jul 2014
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    5
    Location
    Valliant,Ok.
    Tractor
    Ford 7740, 2550 John Deer, 1500 ford

    Default 7740 air condition issues

    I have a 7740 that the air isn't working right. When the weather was cool it worked great when I didn't really need it. Now when its hot it may work some times. If it does come on when it cycles it will not come back on.I jumpered the pressure switch by the compressor didn't help. I jumpered the one on the left side in top of the cab and it works great, but it dosent cycle. What next?

  2. #2
    Super Member RickB's Avatar
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    Sep 2000
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    7,857
    Location
    Eastern NY
    Tractor
    Case 885, Ford 4000

    Default Re: 7740 air condition issues

    Get a set of service gauges and learn how to use them or pay somebody that has them and can. Servicing A/C without gauges is a lot like fixing electrical circuits without a VOM or test light. Success happens more by accident than design when flying blind.
    We have too much gun control.
    What we need is more idiot control.

  3. #3
    New Member
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    Jul 2014
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    5
    Location
    Valliant,Ok.
    Tractor
    Ford 7740, 2550 John Deer, 1500 ford

    Default Re: 7740 air condition issues

    I have gauges and know how to use them. Freon is ok. My problem seems to be more like a pressure switch holding the unit off. That's why I started bypassing pressure switches.

  4. #4
    Super Member RickB's Avatar
    Join Date
    Sep 2000
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    7,857
    Location
    Eastern NY
    Tractor
    Case 885, Ford 4000

    Default Re: 7740 air condition issues

    OK it sounded like you were flying blind. What are the pressures when it cuts out and refuses to come on?
    We have too much gun control.
    What we need is more idiot control.

  5. #5
    New Member
    Join Date
    Jul 2014
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    5
    Location
    Valliant,Ok.
    Tractor
    Ford 7740, 2550 John Deer, 1500 ford

    Default Re: 7740 air condition issues

    When it is operating normally low pressure and high pressure are in range. When it kicks off pressure is HIGH! I dont remember the exact pressures but they are up there. I would have to hook gauges up to give you exact numbers.

  6. #6
    Super Member RickB's Avatar
    Join Date
    Sep 2000
    Posts
    7,857
    Location
    Eastern NY
    Tractor
    Case 885, Ford 4000

    Default Re: 7740 air condition issues

    Faulty TX valve is most likely.
    We have too much gun control.
    What we need is more idiot control.

  7. #7
    New Member
    Join Date
    Jul 2014
    Posts
    5
    Location
    Valliant,Ok.
    Tractor
    Ford 7740, 2550 John Deer, 1500 ford

    Default Re: 7740 air condition issues

    Where is it located?

  8. #8
    Super Member RickB's Avatar
    Join Date
    Sep 2000
    Posts
    7,857
    Location
    Eastern NY
    Tractor
    Case 885, Ford 4000

    Default Re: 7740 air condition issues

    At the inlet to the evaporator coil.
    We have too much gun control.
    What we need is more idiot control.

  9. #9
    New Member
    Join Date
    Jul 2014
    Posts
    5
    Location
    Valliant,Ok.
    Tractor
    Ford 7740, 2550 John Deer, 1500 ford

    Default Re: 7740 air condition issues

    Thanks for the info.

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