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Air dryer,governor replaced. A couple miner air leaks repaired. Still having problem. Any advice? It's been to the local Freightliner shop for 3 days no good. It will not build up. If we play with brake release valves and foot pedal it eventually builds air. Thanks for your reply. Isolate the air compressor, see if it is building pressure.
You may have to use soapy water to look for bubbles. The leak may be behind your dash. Is your air compressor pushing oil through the lines? When you drain the air tanks, is it pure water that comes out or is there oil in it?
Is both gauges reading the same pressure? If everything has checked out, it could be a faulty gauge.By bandcJune 16, in Air Systems and Brakes. I have a questions for everyone. How hot is the air compressor on an 01 CH supposed to get? After running ours for a while, we are not able to build air past 70 to and the air compressor is smoking hot.
If you pour any water on it, it will boil it. Is that normal? Also any ideas as to why it won't build pressure. Put a new regulator on it, adjusted it with the screw both ways this does nothing. Got air to air dryer if you take both lines off the air is coming through the air dryer, could it be the air dryer that is not letting it build up?
I don't want to spend a small fortune on a compressor if I can get away with just an air dryer. Any help would be appreciated. Governor controls cut out and cut in pressure for the air compressor. Did you check for any leaks? If the compressor is running constantly to keep up it will get hot. If I remember correctly the governor actually controls two valves in the air compressor that unload it. These valves can stick.
I had this issue with my CX. Check the main air outlet line, the braided stainless steel line from compressor to air dryer. Over time, any oil in the line will bake and eventually plug the line. This due to its proximity to the engine exhaust pipe. The compressor can't pump through the blockage, overheats, and will ultimately fail.
The air compressor may be getting too hot due to lack of coolant flow. Is the coolant line at the rear of the compressor head routed to the lower right side of the block below the 6 eup pump? If so, the line is most likely packed full of casting sand-an issue with the e-tech engines. There is a service bulletin to re-rout the rear coolant line to the rear of the coolant manifold. You can post now and register later.
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Air Systems and Brakes Search In. Recommended Posts. Posted June 16, Share this post Link to post Share on other sites. I would build up the air. Shut the truck down. Chock it and do the COLA air brake test. Gregg Sent from my XT using Tapatalk.Log in or Sign up.
Find Trucking Jobs. Nov 11, 1. Please Helppp!!! I have a Volvo with an Volvo D12 engine in it. I have a big issue with my air pressure, my air compressor is constantly running, building air up and it purges air every seconds. I have so far replaced my air dryer filter once in June of this year and I am replacing it now again because it combusted has two straight lines through the middle like someone cut it with a knife.
I have replaced my shut off valve on the air dryer, and the rubber little gaskets that go in the valve. I have also replaced my firewall wiring that is under the hood on the side where the steering wheel is. Recently i replaced the fitting on the compressor that goes from the compressor into the little blue line, and I have replaced the air governor also.
None of these things that I have done made the compressor stop building air, nor made it stop purgeing the air every seconds. Also on a side note since I replaced my air governor my PSI in my air tanks went down from in the tanks to before it purges.
Air pressure problems
Please help I am sick of trying to figure out what is wrong with this darn thing. MehoNov 11, Yes, let employers and TruckersReport text me with new opportunities, job alerts and other career information to the number I provided. There is no charge for this service, but standard message and data rates may apply. Nov 11, 2. Sounds like the unloader valves in the air compressor are leaking.
What air compressor is on your truck? Nov 11, 3. Not really sure how I can find out what kind it is? It's an Volvo Ved engine if that helps any. The ugly green one. How dangerous is it to operate the truck with the air compressor constantly running like that?
Nov 11, 4.
Either the unloader valves on the top of the compressor or the purge valve on the air dryer is not seating properly. Can you hear any air leaks after you shut down the truck? Shut the truck off and see if you can determine where there are any air leaks. Nov 11, 5. I'm not sure what compressor they used. You need to install an unloader kit in the air compressor.
It won't cause any immediate harm to use it like that.Log in or Sign up.
Find Trucking Jobs. How to tell if Air Dryer is bad or needs the filter replaced? May 26, 1. Good Morning, I own an international that i purchased about 3 months ago, and noticed that when i drain the air tanks a lot of water mist comes out. Sometimes from the truck yard to the fuel station less than 5 miles it will build up quiet a lot of mist. Is this normal or do i need to replace the dryer or the dryer filter?
Would this also mean the air lines are contaminated with water if so how can i check to make sure? Yes, let employers and TruckersReport text me with new opportunities, job alerts and other career information to the number I provided. There is no charge for this service, but standard message and data rates may apply.
May 26, 2.
Air drier is basically a filter to take moisture out of the air. As with any filter, they do need to be replaced from time to time. Once or twice a year is probably enough. If you drain your air tanks out and are consistently seeing a lot of water, I'd start with changing out the cartridge on the drier. Water in the airlines won't hurt anything in warm weather immediately but it isn't great to have it inside your tanks and aluminum valves.
The water will freeze up in winter though. AModelCatMay 26, May 26, 3. May 26, 4. May 26, 5. That much water is not the filter. Air dryer is not cycling to purge to get rid of the water.Discussion in ' Volvo Forum ' started by wolf riverJul 8, Log in or Sign up. Find Trucking Jobs. Jul 8, 1. Hey there - My 07 Volvo just developed this issue yesterday.
There is one valve on the dryer smaller one that will leak constant air for approx minutes and then stop. While the compressor is running to build pressure up that same value will have constant noise until the pressure reaches psi. After the pressure is back at it will hold pressure for approx minutes while running down the road before it drops psi. Only time you hear air rushing out is only for those few minutes. It will loose air while parked over night not running.
I replaced the dryer filter today and there was gunk inside the housing. I cleaned it out and put a new filter on it. While it was apart I tried to make sure there was no gunk left in the small valve area. The valve can be pushed back up slightly to stop the leak with your hand while its doing it. So I ordered a new dryer that will be waiting for me when I get home.
The real question is - should I run it miles home? Like I said it never drops below 95 psi and the compressor is not running constant. The part that really sucks is for once my reefer isnt running but tonight I get to listen to the air leak. I will be the guy that has the long burst of leaking air every so often.
Thanks in advance for any input - Todd. Yes, let employers and TruckersReport text me with new opportunities, job alerts and other career information to the number I provided. There is no charge for this service, but standard message and data rates may apply. Jul 10, 2. Don't buy the dryer if you bought a new filter get the rebuild kit I made that mistake. Also never hurts to replace the governor too. Jul 10, 3.
Jul 11, 4. Am I missing something - The turbo valve is only held in place but a snap ring - remove that valve comes out make sure the hole is clean, lube up the o rings on the new turbo valve put it back in and crack open a cold one??? Seems a little to simple for a Volvo??? Jul 11, 5. Jul 15, 6. Happens to all of our tractors running the meritor Air dryer. We keep those in stock at our shop. The meritor part number is R Volvo part number is and it takes about 5 minutes to change it out. DamageJul 15, Jul 15, 7.
I just got home tonight so first thing tomorrow I will change out the turbo valve. Thanks to everyone. Jul 16, 8. Well I think it took 7 minutes.Forums New posts Search forums. Media New media New comments Search media. Resources Latest reviews Search resources. Log in Register. Search titles only. Search Advanced search….
Having a recurring problem building air pressure. Air dryer,governor replaced. A couple miner air leaks repaired. Still having problem. Any advice?
It's been to the local Freightliner shop for 3 days no good. It will not build up. If we play with brake release valves and foot pedal it eventually builds air. Thanks for your reply. Isolate the air compressor, see if it is building pressure. You may have to use soapy water to look for bubbles. The leak may be behind your dash. Is your air compressor pushing oil through the lines?
When you drain the air tanks, is it pure water that comes out or is there oil in it? Is both gauges reading the same pressure?Happy New Year! In a recent article we discussed the basics of how air brake systems work. I would like to pick up where we left off by discussing some of the problems you may encounter with your air brake system. Compressors The compressor is the part that builds up air pressure, which is then delivered throughout the system to supply tanks that are used for service brakes, emergency brakes and trailer brakes.
Because the compressor is lubricated and cooled by the engine, there is the possibility of oil and coolant leaking into the air system. This can cause damage to the compressor and the rest of the system. Another cause could be that the oil return line to the engine is blocked. Make sure this line is free of kinks or sharp bends. The drive gear or pulley could be loose and need tightening. The drive gear could also be worn and need to be replaced. Another important point to remember is that air compressors need to have clean air going into them.
In some systems, the compressor has its own air cleaner. Air dryers Once the air leaves the compressor, it goes through the air dryer, where all the impurities in the air are removed. However, the air dryer falls subject to many factors that can cause it to malfunction. If working properly, the dryer should cycle on and off to exhaust impurities out of the system.
If the dryer is constantly cycling, inspect the system for air leaks. If you notice the dryer is not purging or exhausting air, check the line to the compressor to make sure it is in good shape and not plugged. A faulty purge valve can also cause the dryer to fail. Make sure to service air dryers periodically to avoid having dirty air circulate through the system and end up in the supply tanks.
In the winter, any moisture trapped in the system can cause freeze-ups. In the summertime, gunk and debris can clog up the system. Some air dryers have desiccant cartridges that absorb moisture. These cartridges can become too contaminated to function properly and must then be replaced. Reservoir supply tanks The supply tanks throughout the air system must be monitored closely. Air must be available in the supply tanks in order for the brakes to be applied, which occurs with the help of relay valves.
Why do we need that reservoir air waiting in the supply tanks? You do not want to wait for air pressure to build up and reach the supply tanks, especially if you need the brakes to work quickly.
2007 VOLVO 670 Air Compressor Issue
Therefore, supply tanks should always work as efficiently as possible. Water accumulation can occur from time to time in reservoir tanks. As the air is compressed, it heats up, causing any moisture to evaporate, pass through the compressor and air dryer and then condense in the supply tanks.
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