Help with Air Compressor on CAT C15

Discussion in 'Trucks [ Eighteen Wheelers ]' started by ahmadali04, Feb 28, 2013.

  1. ahmadali04

    ahmadali04 Bobtail Member

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    Jan 30, 2011
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    Hi. I have a Bendix Air Compressor on a CAT C15, that is leaking air from the safety valve on top of the compressor. It is causing the air compressor to run all the time. Any ideas on what it could be? Thanks.
     
  2. bubbanbrenda

    bubbanbrenda Road Train Member

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    Feb 27, 2011
    Middletown,Oh.
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    Without a picture I'm not sure, but it sounds like a unloader valve. I would replace it first before I bought a complete compressor.
     
  3. puncher

    puncher Medium Load Member

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    What he said, they're known for being troublesome.
     
  4. CatPowerC15

    CatPowerC15 Medium Load Member

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    Feb 18, 2010
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    If the pressure is not too high, then the brass safety valve is just leaking....not the governor. Assuming you mean the brass 7/8 socket size valve screwed in the side of the compressor head.
     
  5. little cat 500

    little cat 500 Road Train Member

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    Jan 17, 2010
    Abbottstown PA
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    mine did the same thing on the safety valve put a new valve in and problem solved hope thats all you need
     
  6. ahmadali04

    ahmadali04 Bobtail Member

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    Jan 30, 2011
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    I replaced the brass safety valve, and it is still leaking a little bit. It's a lot better than before, where before it was constantly leaking at high pressure. Now, I can hear it just a little bit, with the parking brake on, but it seems to go away when, I release parking and trailer brakes..Is this normal? Thanks.
     
  7. Bob Chute

    Bob Chute Bobtail Member

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    Sep 3, 2013
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    Hey guys , this is helpful , I have the same problem with the unloader valve ? WHERE CAN I PURCHASE ONE . Thank you .. Bob @ chutetrans@yahoo.com
     
  8. puncher

    puncher Medium Load Member

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    Most any Pete, KW dealer, or TruckPro, Fleetpride, and maybe Cat(but would probably be more expensive).
     
  9. GP1500SC

    GP1500SC Light Load Member

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    Sep 10, 2011
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    Cat has a updated unloader valve it has the oring on the out side of the plunger instead of the inside, I have replaced the old style on a BSX and a MXS so don't when they started coming with the newer design.
    I just ordered them both times and got the newer ones with out asking.
     
    puncher Thanks this.
  10. Bob Chute

    Bob Chute Bobtail Member

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    Sep 3, 2013
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    Puncher , thanks man , I did get one , and low and behold .... ALL FIXED , Thanxs for reply
     
    puncher Thanks this.
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