Air Compressor pumps to much Air when cold

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Diesel Dave, Dec 13, 2011.

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  1. Dec 13, 2011 #1
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    I have a 5EK Cat series and the air compressor pumps over 120 and keeps going when its cold. Once it warms up about 15 or so minutes later, it runs normal. I've replace the governor with a brand new one and bypass my air dryer and still have the problem. I've been told to check the overloader assembly which sits on top of the compressor but I havent yet. Could it be the overloader assembly or something else ? And can anything in the air system be damage with to much air being pump ?
     
    Diesel Dave, Dec 13, 2011
    Diesel Dave, Dec 13, 2011
    #1
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  3. Dec 13, 2011 #2
    Poor boy

    Poor boy Bobtail Member

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    I had to replace my pressure signal line from my air tanks to my governor because of a similar issue. A plugged spot in the line made it sometimes slow to respond both in kicking in and out. Although if my memory serves me correct I did not figure this out until after i replaced 2 governors, an air dryer, and made Cummins warranty a compressor.
     
    Poor boy, Dec 13, 2011
    Poor boy, Dec 13, 2011
    #2
  4. Dec 14, 2011 #3
    Dino1968

    Dino1968 Light Load Member

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    What he said ^^^ 2 years ago my return line froze up and my compressor took me up to 150 +. The signal line tells the compressor to shutoff ,if it's plugged up the compressor ain't stopping till you blow your relief valve.
     
    Dino1968, Dec 14, 2011
    Dino1968, Dec 14, 2011
    #3
  5. Dec 15, 2011 #4
    KW Parts Guy

    KW Parts Guy Light Load Member

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    You may need to throw an unloader kit into that compressor. Sounds like the problem.
     
    KW Parts Guy, Dec 15, 2011
    KW Parts Guy, Dec 15, 2011
    #4
    Diesel Dave and dibstr Thank this.
  7. Dec 16, 2011 #5
    oneshot

    oneshot Medium Load Member

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    The pop off valve should prevent any damage and u descibe symtoms of needing an unloader kit.Not very expensive and u can do it yourself.Good Luck
     
    oneshot, Dec 16, 2011
    oneshot, Dec 16, 2011
    #5
    dibstr and Diesel Dave Thank this.
  8. Dec 16, 2011 #6
    JohnP3

    JohnP3 Road Train Member

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    If the unloaders are the problem remove the air intake to the compressor and build the pressure up till it unloads, shut it off, if there is air leaking into the intake the unloaders are done and need a kit. I use an adapter and shop air to test the compressor. Also remove the air line to the governor from the wet tank you can tell if it is restricted. By the air flow. If in doubt take off the line to the fan solinoid, as a test.
     
    JohnP3, Dec 16, 2011
    JohnP3, Dec 16, 2011
    #6
    dibstr and Diesel Dave Thank this.
  9. Dec 16, 2011 #7
    dibstr

    dibstr Road Train Member

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    Got my vote!
     
    dibstr, Dec 16, 2011
    dibstr, Dec 16, 2011
    #7
    Diesel Dave Thanks this.
  10. Dec 17, 2011 #8
    logtrucker25

    logtrucker25 Light Load Member

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    I had the same problem it was a piece of rubber blocking the inside of the signal line where it goes on the governor
     
    logtrucker25, Dec 17, 2011
    logtrucker25, Dec 17, 2011
    #8
  11. Jan 15, 2012 #9
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    Finally bought the unloader kit, installing it tomorrow, will update later.
     
    Diesel Dave, Jan 15, 2012
    Diesel Dave, Jan 15, 2012
    #9
  12. Jan 15, 2012 #10
    Scrapper

    Scrapper Light Load Member

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    We have a w900 that has always unloaded at 130psi. Has been that way for years...no problems. Although all the rest are at or around 120 to 125. Like oneshot said...popoff valve will pop before you ever have any damage. We use shop air also to find problems. Built an adaptor to test our fan clutches. Seems like we have done a few here lately. Fans wouldn't disengage. Had bad oring. I think I could rebuild one in my sleep now. lol. Good fan clutch would disengage with about 40psi...these would take between 85 and 105psi to disengage...and you could here the leak in the clutch. Used the air regulator on our dryer to test.
     
    Scrapper, Jan 15, 2012
    Scrapper, Jan 15, 2012
    #10
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