adjusting air govenor

Discussion in 'Trucks [ Eighteen Wheelers ]' started by gunner76, Aug 30, 2011.

  1. Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    reasons we have to reajust pressure are:
    - owner wanna haul overload and we increase air suspention tank pressure, but all standard air components are 12 BAR rated so we use to increase air pressure up to 12 bar. If more, air valves may fail in less a year.
    - if owner wants to convert 6x4 ore 6x2 trucktor to 4x2. They usually want to shorten frame, and weight distribtibution changes. it is easy way make a yard mule of old cabover.

    anyway 12 bar is the limit. but some trucks are with one cyl. compressors and if you increase pressure compressor may be worn soon. I saw these problems with MAN F2000 of UK version convertd from 6x2 to 4x2 and with some Volvo VN trucks with WABCO one cyl compressor
     
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  3. rollin coal

    rollin coal Road Train Member

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    Mar 29, 2008
    TN
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    Yeah I deal with that every week airing tires up to 105. I pump the brakes down before it even goes to 110 on the gauge. Takes forever to air up just 5 or 6 tires if they're only 5 lbs low. Next question, can my air system handle 130 or 135? Will the tanks and lines be ok? I'm pretty sure the compressor will be ok. I've never seen one as big as what's on my C15 on other C15's. It's about the size of a small block Chevy lol. 2 cylinders with a 1" steel braided air line out of it. Sure would make life easier if I had it cut off at 130. Think it'll be ok?
     
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  4. bender

    bender Road Train Member

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    Jul 20, 2010
    Don't Kid Yourself
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    Some will say oh what the heck, it's only 10-15 psi more, no big deal! But that 10-15 psi on the high end on top of 120 psi works your compressor to an early death and the higher pressure puts added strain on air components. Yes, it will work, but with some sacrifice down the road. Only time will tell.
     
  5. KW Parts Guy

    KW Parts Guy Light Load Member

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    Jul 16, 2011
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    No such thing as an OEM governor, they are all made by Bendix/Meritor or rebuilt by a third party. The old compressor mounted version is pre-set at 125psi and is adjustable, and the newer style is preset at 135 and not adjustable.
     
  6. dave26027

    dave26027 Road Train Member

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    Sep 10, 2009
    Dallas, Texas
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    HMMM.... Honestly, I've turned up the pressure in all my trucks. Never thought 15 more psi would damage the compressor. Your only limit is the safety pop-off valve on your reservoir. On older tractors you could be concerned about ageing air lines or maybe added stress to corroded steel tanks, but if they'll fail because of 15 more psi, they were about to fail anyway.

    I know one thing- the air tools work really good and the air system in this wagon is adjusted the way I like it, that's the way it should be.
     
  7. SHC

    SHC Spoiled Rotten Brat O/O

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    Westville, IN
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    We used to run 140psi when I was doing heavy haul (100k+) but since I am back to tankers, I set it at 120psi and am happy. I have a craftsman rechargeable impact that works great and most T/A's have free air for tires. And honestly, if it's more than 2 tires, I flip the mechanic $10 and he airs all of them to the requested setting ;)
     
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  8. Texas_incognito

    Texas_incognito Light Load Member

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    Oct 9, 2012
    Texas
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    My compressor cuts out at 120, the air dryer pops off and my air pressure immediately drops back to 100 psi and stays at 100 psi until I do something that causes the air to drop below 100 psi at which time the compressor kicks in, takes the PSI to 120, the air dryer pops off and the pressure goes back to 100 again. Is there a way to adjust the "cut in" pressure or to adjust how much air the truck keeps in reserve?
    I am a heavy hauler and I need more air in the system for me air bags for some of the loads that I haul. With 100 psi in the system, the bags are almost flat and the suspension "bottoms out." I have replaced the leveling valve and adjusted the bags up but it does not help with an extra heavy load. I notice that what ever my air reads, my suspension pressure gauge also reads. If I have 100 psi in the tanks, I have 100 psi on the suspension gauge. I'm thinking if I could get the compressor to maintain more air available in the system, it would help with my suspension bottoming out. Any ideas?
     
  9. Heavyd

    Heavyd Road Train Member

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    That 20 psi drop should really be fixed. Increasing the cutout pressure is only covering up the real problem. Does it drop with or without a trailer? After the compressor cuts out, kill the engine and check for leaks.
     
  10. Semi Crazy

    Semi Crazy Road Train Member

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    May 13, 2011
    Middle Tennessee
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    I would fix my leaky tires instead of raising air pressure over 120.

    It was on here I read about Volvo air tanks splitting.

    Imagine how many times you have to stomp the brake treadle during a DOT inspection to drop the air from 135 to 60 so the buzzer and light comes on.

    If I wanted more air I would add an extra tank for more volume.
     
  11. HISPEED428

    HISPEED428 Light Load Member

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    Mar 28, 2009
    Plum Coulee,MB
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    More axles maybe???
     
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