Truckers Report Jobs

Find Trucking Jobs

Company Driver Company Driver Dry Van Dry Van Flatbed Flatbed Refrigerated Refrigerated Specialized Specialized Owner Operator Owner Operator
More Trucking Job Searches ⌄ Fewer Trucking Job Searches
⌃

Cummins ISX

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Canary379, Mar 19, 2025.

  1. Mar 19, 2025 #1
    Canary379

    Canary379 Light Load Member

    73
    3
    Apr 13, 2012
    Illinois
    0
    Have a 2007 Cummins ISX having some air issues. Seems like the compressor keeps pumping but won’t get over 120. I replaced the air dryer (ad-is) and still won’t go over 120 and kick the governor on to purge. Thoughts?
     
    Canary379, Mar 19, 2025
    Canary379, Mar 19, 2025
    #1
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Mar 19, 2025 #2
    Ridgeline

    Ridgeline Road Train Member

    22,636
    120,581
    Dec 18, 2011
    Michigan
    0
    Replace the governor.

    Why did you think it was the Air Dryer?
     
    Ridgeline, Mar 19, 2025
    Ridgeline, Mar 19, 2025
    #2
  4. Mar 19, 2025 #3
    ElmerFudpucker

    ElmerFudpucker Road Train Member

    6,428
    70,659
    May 17, 2024
    0
    Why do you want it to go over 120? You don’t need to replace the governor. Just adjust it. But 120 is all you need
     
    ElmerFudpucker, Mar 19, 2025
    ElmerFudpucker, Mar 19, 2025
    #3
  5. Mar 19, 2025 #4
    Canary379

    Canary379 Light Load Member

    73
    3
    Apr 13, 2012
    Illinois
    0
    It’s a brand new dryer and governor. It’s the ad-is dryer. Govornor comes new with it installed on the dryer.
     
    Canary379, Mar 19, 2025
    Canary379, Mar 19, 2025
    #4
  7. Mar 19, 2025 #5
    Canary379

    Canary379 Light Load Member

    73
    3
    Apr 13, 2012
    Illinois
    0
    They usually go 120-125 then purge. This isn’t purging. Then after a while of driving it won’t go over 90 psi. The ad-is air dryer come with the govornor attached to it and is non adjustable for those unfamiliar.
     
    Canary379, Mar 19, 2025
    Canary379, Mar 19, 2025
    #5
  8. Mar 19, 2025 #6
    Goodysnap

    Goodysnap Road Train Member

    3,748
    9,115
    Jul 12, 2017
    0
    Air test the unloader line between the compressor and the governor. Also check the discharge line especially the cloth braid hose for leaks. They will leak right after the steel pipe off the compressor.

    The ADIS governor is preset to 130 and is not adjustable.
     
    Goodysnap, Mar 19, 2025
    Goodysnap, Mar 19, 2025
    #6
  9. Mar 19, 2025 #7
    ElmerFudpucker

    ElmerFudpucker Road Train Member

    6,428
    70,659
    May 17, 2024
    0
    It sounds like you have a massive leak. Is the fan hub leaking? It would be hard to hear with the engine running.
     
    ElmerFudpucker, Mar 19, 2025
    ElmerFudpucker, Mar 19, 2025
    #7
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.