welldigger
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Ya I was just thinking that. I need to look up the amp draw of the heater on my dryer. Which is a haldex pure air plus.
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Air Dryer for an M35A2
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rustystud
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View attachment Scan0003.pdfView attachment Scan0004.pdfView attachment Scan0005.pdfView attachment Scan0006.pdfView attachment Scan0007.pdf
Hey Aaron, hope this helps. Also a reminder to all that the Haldex Pure Air is cheaper to buy especially from auction and military venders, but the Bendix AD-9 is cheaper to maintain. It costs twice to 3 times the amount of money to buy the filters and small parts for the Haldex then it does for the Bendix. On average the Bendix AD-9 costs $60.00 to service and you only service it once every 3 years. While the Haldex Pure Air costs on average $120.00 to $180.00 (depending who is selling the parts) to maintain it every 2 years ! (According to Haldex's service manual ).
brianp454
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I've been thinking about this for some time also. Bendix Service Data info attached.
http://www.haldex.com/en/North-America/Applications-Products/Brake--Suspension-Systems/Product-Catalog/Air-DryerAir-Line/Air-Dryers/Competitive-NewRemanufactured/Bendix-AD-9-/1928/View attachment air_dryer_ad-9_installation.pdf
List of part numbers in the link above. Don't forget to order the 24v version. Also, it seems like there are genuine Bendix versions available and knock-off versions. I'm assuming that Haldex bought Bendix at some point based on the link.
http://www.haldex.com/en/North-America/Applications-Products/Brake--Suspension-Systems/Product-Catalog/Air-DryerAir-Line/Air-Dryers/Competitive-NewRemanufactured/Bendix-AD-9-/1928/View attachment air_dryer_ad-9_installation.pdf
List of part numbers in the link above. Don't forget to order the 24v version. Also, it seems like there are genuine Bendix versions available and knock-off versions. I'm assuming that Haldex bought Bendix at some point based on the link.
rustystud
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Yes, a few years ago Bendix was bought by Haldex. The AD-9 will be fazed out, but since it was used for over 3 decades parts will still be made. That is why I'm buying one now. The parts are also being made by other after-market people, so no fears there. I'm going to buy an Original Bendix not a copy. The units will out last the truck. Just as they have outlived our buses. Just a side note, our buses must last for over 15 years according to the federal government. Most last well over 20 years in active daily service.
nchittendon
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I'm assuming the ad9 units I find online for $150 are knock offs?
rustystud
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Sadly yes . An original Bendix AD-9 will cost around $250.00 to $300.00 , but you only have to buy it once ! The castings from Bendix are extremely well made. I cannot vouch for the aftermarket ones. I forgot to add, at this price you will get the bracket and wiring for the heater element.
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You think they figure the 2 years service was based on a road tractor running everyday of it's life, where we are most likey weekend warriors?
welldigger
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You can get more life out of a dryer than 2 years. However, if your truck sits for too long it can ruin the desiccant cartridge. It needs the hot air from the compressor from time to time so it can dry out and purge.
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The few I have change the coalescing filter is the real nasty.
welldigger
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Yes I agree. It seems to catch all the nasty stuff. But, the desiccant filter reaches a point it won't absorb water anymore. Not really sure why.
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Not to question is the why. Hurry up too fix and fly.
rustystud
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The desiccant filter is always absorbing water from the air, so after you open it, it's shelf life starts ticking. Yes the heat from the compressor helps recharge it a bit, but never to it's new condition.
welldigger
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I realize this. I have a desiccant filter on my shop air compressor for my plasma cutter. You are supposed to be able to put it in the oven and dry it out. Turns out that's a total waste of time. Yay! But my cutter is a tad bit more expensive than a new desiccant cartridge.
I guess what I'm getting at is you would think you could dry the water out of the silica beads. But it seems they get to a point they won't release the water anymore. Either that or they won't absorb it anymore.
rustystud
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The newest air dryer system our Transit system is using is the "dual coalescing filter" unit. It switches directions after a predetermined time and is supposed to blow out the filter. It also has a heater unit inside. Even with all that, the desiccant is changed out every 3 years. It was at first suppose to last 5 years. That didn't pan out. It does last longer then the older AD-9 which has to be changed out every year on a buss. (in a over the road truck like our deuces the AD-9 will last 3 years before desiccant change out).
If you wanted to buy one of these new wonder air dryers it will cost you over $1000.00 . I will stick with the old AD-9 at that price.
If you wanted to buy one of these new wonder air dryers it will cost you over $1000.00 . I will stick with the old AD-9 at that price.
nchittendon
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Just got a new Haldex air dryer for $140 shipped. I plan to install it where the tool rack currently is.
rustystud
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The Haldex unit is nice, but it cost 2 to 3 times the amount of money to change out the desiccant . So just after one servicing the Bendix AD-9 is cheaper to operate.
Jeepsinker
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Just priced a service kit at napa for the dryer on my M936... $130 for the kit. A member has whole new dryers in the classifieds for $140 shipped as I recall...
rustystud
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The kit for a AD-9 is only $40.00 . $60.00 if you get the spitter valve also.
JasonS
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I've had good luck using a vacuum oven to dry out dessicant (assuming the only contaminant is water).
rustystud
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Sounds expensive. How much does a vacuum oven cost ? and why do you have one ?