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
adjusting air govenor
Discussion in 'Trucks [ Eighteen Wheelers ]' started by gunner76, Aug 30, 2011.
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dave26027 Thanks this.
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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.
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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. -
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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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? -
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.
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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.Prom Night Dumpster Baby Thanks this. -
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