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Old 04-03-2014, 10:08 PM   #1
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Bendix AD-9 Air Dryer service / replace

2011 Coach, thinking about PM for the Air Dryer. Haldex / Bendix AD-9. This is not the screw-on canister type of cartridge, more like an upside down can on a manifold. I am fairy handy underneath the coach. Is this something I should get a rebuild kit for, exchange as a core for a rebuilt unit or simply replace with a new unit?
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Old 04-04-2014, 05:04 AM   #2
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You can replace with a kit. check out http://www.fleetpride.com/truck-part...-%205.2013.pdf
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Old 04-05-2014, 02:49 PM   #3
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2011 Coach, thinking about PM for the Air Dryer. Haldex / Bendix AD-9. This is not the screw-on canister type of cartridge, more like an upside down can on a manifold. I am fairy handy underneath the coach. Is this something I should get a rebuild kit for, exchange as a core for a rebuilt unit or simply replace with a new unit?
It's a 2011 unit I can't imagine it would need rebuilding!!! I new filter might be in order... But unless it's leaking air it won't need rebuilding. We get 5 or so years and over 500,000 miles out of them on our road trucks.
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Old 04-05-2014, 05:29 PM   #4
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Thanks for the replies. Right, 3 year old coach. I seem to recall from Camp Freightliner that it should be serviced at 3 years.
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Old 04-05-2014, 06:25 PM   #5
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I wouldn't see a need to service the air dryer till you start seeing moisture in the air tanks. You do bleed off the tanks and check them don't you?? As stated, these modern dryers are capable of lasting over five years and going 500,000mi before having to be serviced as they purge off any moisture they collect at governor kick off. Time age is not the factor here, it's how much air has it filtered if you know what I mean. Half a million miles worth of air!!
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Old 04-12-2014, 08:52 PM   #6
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Ive found that replacing the filter with the unit in the chassis is a bit of a chore. Too much road dirt and sometimes grease from the drive shaft spin off. I remove it from the chassis, clean it up and replace the filter and "O" ring seal on the bench and then reinstall.
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Old 04-12-2014, 09:21 PM   #7
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I wouldn't see a need to service the air dryer till you start seeing moisture in the air tanks. You do bleed off the tanks and check them don't you?? As stated, these modern dryers are capable of lasting over five years and going 500,000mi before having to be serviced as they purge off any moisture they collect at governor kick off. Time age is not the factor here, it's how much air has it filtered if you know what I mean. Half a million miles worth of air!!
I disagree. Most HDT truck repair shops say if you see water in your storage tanks it is likely too late. Moisture has already gotten into your brakes and began to cause corrosion. In cold weather that moisture freezes and you have no brakes. Take your choice, replace the desiccant filter for ~$60, or rebuild/relace the brake actuators for nearly 1 Grand.
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Old 04-13-2014, 11:20 AM   #8
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You do bleed off the tanks and check them don't you??

Yes, I do. The system automatically does so as well. But I cannot see whether or not there is moisture in the bled off air - it's out of sight.
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Old 04-13-2014, 11:25 AM   #9
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Ive found that replacing the filter with the unit in the chassis is a bit of a chore. Too much road dirt and sometimes grease from the drive shaft spin off. I remove it from the chassis, clean it up and replace the filter and "O" ring seal on the bench and then reinstall.

Thanks! You just reinforced my original inclination.
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Old 04-14-2014, 12:20 PM   #10
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Yes, I do. The system automatically does so as well. But I cannot see whether or not there is moisture in the bled off air - it's out of sight.
I bleed it onto concrete and then dismount and check for moisture on the concrete beneath the filter. Never get any moisture here in sunny California.
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