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Old 10-04-2011, 09:17 AM   #1
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Haldex air dryer and air filter on 390bh

Has anyone changed the Haldex air dryer and the air filter on a 390 bh?

Just got the parts and looking for some info on how to go about changing these.

Any helpful hints are appreciated.

Thanks.
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Old 10-04-2011, 09:45 AM   #2
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Originally Posted by tmmar View Post
Has anyone changed the Haldex air dryer and the air filter on a 390 bh?

Just got the parts and looking for some info on how to go about changing these.

Any helpful hints are appreciated.

Thanks.
I have changed air dryers on trucks.
First of all you need to bleed all of the air out of the system
I believe yours should have a screw on filter correct?
did you get a purge valve kit and a heater kit?
I would recommend changing those as well.
Most kits have install instructions included.
you may need a snap ring pliers
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Old 10-08-2011, 10:07 PM   #3
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How often should you change the dryer?
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Old 10-09-2011, 01:36 AM   #4
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Once a year change filter.
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Old 10-09-2011, 12:45 PM   #5
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Freightliner says to change the air dryer every 36 months. My coach is just over that time which is why I am changing it now. As for the air filter, I just noticed that the restrictin indicator by the radiator in the rear of the coach has moved towar the red (not really close but closer than it has been) so I will change that as well. It will depend on your driving conditions (very dusty, for example) which will cause you to change it earlier than needed.
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Old 10-09-2011, 03:10 PM   #6
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I mean change the the air dryer filter once a year .
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Old 10-09-2011, 03:41 PM   #7
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As far as I know, there is no seperate air dryer filter only the Haldex air dryer which has a 3 year change cycle.
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Old 05-21-2012, 05:59 PM   #8
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I'm about to change my air filter and also my Haldex air dryer filter. Can anyone offer advice, pictures etc. The air filter looks kind of straight foreword for me to do but the Haldex air dryer appears complicated. I'm limited on skills but think I can do both. Could use some help here please and thanks. I recall reading on this site step by step with pics but cannot locate it. Thanks...Ron
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Old 05-21-2012, 06:50 PM   #9
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They are both fairly easy and straight foward. You need ot loosten the straps holding the air filter and get the rubber hoses off the air filter. That will be the hardest part since the rubber gets stuck to the filter. Probably because of the heat. Put the hoses on the new air filter and install tightening up the straps holding it in place.

As for the air dryer, this is very easy. Once you get the replacement cartridge, there are 4 bolts around approximately the middle of the air dryer. After draining the air tanks, remove the 4 bolts and lift off the cover. Once the cover is off, you can remove the old cartridge. You need to press down slightly on the old cartridge and turn it counter clockwise. This will release the cartridge, You can now install the new cartridge by putting in the cover and pressing down and turning it cloclwise to lock in place. Lubricate the new 'O' ring and put it on the air dryer and reinstall the cover with the 4 new bolts. It should take no more than 15 mins to change. I would appreciate it if others could review my procedures to see if I missed anything.

Ron
I remember that had a 200lb relief valve installed because the air dryer was 'puffing' alot. Did that solve your problem?

If you take a look at you filter and air dryer and have any other questions, let me know.

Thanks,
Tom
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Old 05-21-2012, 08:15 PM   #10
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Thanks Tmmar First off yes I change the 200 psi relief valve last fall on the air dryer and that solved the puffing. All seems good with it.

Your notes seem straight forward (I hope for me) . On the air filter is the steel canister (ie is the filter inside it or do you change the entire still canister ?) I looked under today and see what you mean. So to confirm loosen off the 2 rubber hoses on each end and also loosen the 2 steel strap holders and it should come down (I have not yet purchased the filter.) I look at the air purifier. I do see the 4 bolts up top. This seems more difficult. I'm guessing I need to remove all the dirt etc so it don't fall down. This is not a lot of room but its doable. I'm going to try and tackle these myself. Thanks for the updates. Yes I may ask for more info. ....Ron
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