Using an external air compressor on an old Loadstar 1700.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by kmmontandon, Aug 13, 2022.

  1. kmmontandon

    kmmontandon Bobtail Member

    6
    1
    May 21, 2021
    0
    I've got a 1970 International Loadstar with a dead engine that I need to move, and I can't get the caging bolt to turn inside the chamber to open up the spring break (it fits in the slot, then refuses to turn to lock in place). I'm considering hooking an air compressor up somewhere along the air system to pressurize things long enough to release and hold open the brake - anyone have any suggestions as to the best spot to hook up external air, and the best fitting to swap in place to do so?

    Obviously, I'd want something that would close off when I removed the air chuck, so I wouldn't have to keep the hose attached, which kind of complicates things. I feel like the interconnectedness of the system means I could pressurize from anywhere upstream from the brake chambers, and am wondering if it's possible to push air through the existing compressor.
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

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

  3. bonder45

    bonder45 Road Train Member

    1,637
    4,611
    Oct 2, 2011
    Williston, ND
    0
    If I read that correctly…..

    Can you just take a 5/16 wrench and adjust your brakes till they back off ?
     
  4. MAMservices

    MAMservices Light Load Member

    143
    715
    Aug 9, 2021
    Mississippi
    0
    Remove discharge pipe from on top of air compressor and plumb your air source into this hose or pipe. If it’s old it prolly a copper tube coming off of the air compressor and possible a #10 size female fittting you will need to plumb into on the hose going to the air tanks on the truck
    You can add an in line valve if you wish but the check valves in the tanks should hold the air. If nothing else do,this long enough to release the brakes if,they will and adjust them off in the event you have a killer air leak some where.
     
    Bean Jr. Thanks this.
  5. Lyle H

    Lyle H Heavy Load Member

    957
    1,948
    Apr 16, 2014
    0
    The governor on the compressor probably has an unused port with a 1/4 inch plug in it.
    Take it out and install a standard schrader valve.
     
    Last edited: Aug 13, 2022
  6. baha

    baha Road Train Member

    4,137
    2,826
    Jul 25, 2013
    ga
    0
    Just take whole brake chamber off by taking the two nuts off the bracket that holds it on, and knock the pin out, and let it ride straped on till you get it running and buy a new brake chamber?
     
    JolliRoger Thanks this.
  7. SmallPackage

    SmallPackage Road Train Member

    3,616
    10,758
    Dec 20, 2019
    Marion Texas
    0
    Leave the air system intact and just pull a plug out of an air tank and install a “P” type air coupler in hole. Hook up external shop air hose and slowly let air flow in. The coupler will allow the hose to be disconnected and leave system aired up. 12C167B6-1B2A-4058-B859-DCFF22C7AFF3.jpeg
     
  8. SmallPackage

    SmallPackage Road Train Member

    3,616
    10,758
    Dec 20, 2019
    Marion Texas
    0
    9655D086-614E-49E6-9D0A-B9A4F3143AC7.jpeg
    this is what i’ve done to the ‘65 White I’m working on now. I can air up the system with shop air. I can check for leaks, Release brakes, Use brake pedal and run anything that requires air without starting and running the engine. Works great for cold starts in the shop. I don’t have to wait 5 mins for compressor to air system to move truck outside while shop fills up with smoke.
     
    Bean Jr. Thanks this.
  9. lester

    lester Road Train Member

    2,373
    5,962
    Jan 2, 2012
    NW, Iowa
    0
    Yeah just put some fittings in the air tanks. Might have to air up more than one tank depending how it's setup.

    We had a running truck with bad compressor. Put gas powered compressor on cat walk and drove it 20 miles to the shop.

    It's handy to have air fittings on tanks anyway
     
    Bean Jr. Thanks this.
  10. LongRun John

    LongRun John Bobtail Member

    6
    0
    Aug 18, 2022
    0
    Can this cause the truck to roll backwards even if you have pulled the brakes.
     
  11. lester

    lester Road Train Member

    2,373
    5,962
    Jan 2, 2012
    NW, Iowa
    0
    No
     
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

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

  • Draft saved Draft deleted