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Old 08-01-2014, 04:46 PM   #1
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Air Dryer Maintenance

All - I have to do the maintenance on the Air Dryer. I am not sure which unit is on my 07 APEX. I need to clean it off and see which one I have. Any suggestions on where to get the filter, O-ring and I think the kit to change it?

Thank you in advance.
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Old 08-01-2014, 04:52 PM   #2
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Air Dryer Maintenance

Got mine on eBay for $79.
Best price I could find was $149. Wholesale.
Get your part # and do a search on the internet and eBay in particular.
Mine is a Haldex Midland DQ6026 General Service kit.
The one I got say for Military Trucks. Just as long as the part number is DQ6026 it the one. Right now I see the kit on EBay for $110 and free shipping.
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Old 08-01-2014, 04:59 PM   #3
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Unless your air tank drain is showing problems --like water or oil--your filter is still doing its job. Change it if you want but its probably not necessary at this time...as quoted from a Bendix tech who I was trying to order a drier cartridge from....13 yrs and 150k miles--still no oil or water?????
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Old 08-01-2014, 05:05 PM   #4
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Meritor-Wabco says to change their's every 2-3yrs.
If you wait till there's water coming out of your tanks, your probably going to be changing more than a filter!
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Old 08-01-2014, 05:22 PM   #5
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Seeing a little oil come out and leave a mark on he ground. It's been 8 years since the coach was built and 6 years since we have owned it. Time to do the maintenance, and then another thing I don't have to worry about.
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Old 08-01-2014, 05:52 PM   #6
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Not sure how anyone can help until you tell us which air dryer you have. I could ramble on, as many do, about how I fixed mine but that may not be relevant to your situation.
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Old 08-01-2014, 08:00 PM   #7
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Geeees---I sure hate getting folks all upset....think the reason you have a drain on your air tank[s] that you check routinely [daily] is so you can detect contamination. The other driver is volume of air used/produced--coaches with air brakes produce more air than say an Alpine with only air suspension. Though I have also heard it said that even air suspension is considered a "high use" vehicle. After 150k miles, my sniffer valve is clean and dry [yes, it pops-off regularly]; I have seen newer Alpines with very dirty valves, which may relate to compressor governor or rotor valve issue. With regard to make or brand of dryer--think I have seen both Bendix and Haldex brands on Alpines.....
Sooooo, guess its time to change mine too....
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Old 08-02-2014, 07:09 AM   #8
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According to the specs for the '07 Alpine you should have a Haldex PURest air dryer. This is very different from the AD9 that I have so I cannot offer much help. Click on the above link for more details.
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Old 08-02-2014, 09:47 PM   #9
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All - It's a Haldex PURest M4253F as best as I can make out. I am going to assume, that the part number is: DQ6050. Going hunting for the parts, anyone ever get it from Napa or Fleetpride? Thanks for all the input.
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Old 08-02-2014, 10:25 PM   #10
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Quote:
Originally Posted by Old Rv'er View Post
All - It's a Haldex PURest M4253F as best as I can make out. I am going to assume, that the part number is: DQ6050. Going hunting for the parts, anyone ever get it from Napa or Fleetpride? Thanks for all the input.

$108 including shipping on Ebay
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Old 08-03-2014, 12:23 AM   #11
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Monty, #N4253F, Desicant Cartridge DQ 6050. Besides Napa you can also try Brake Systems INC in Portland 503 2362116. They are a Haldex distributor. I replaced mine a couple years ago.
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Old 08-03-2014, 08:03 AM   #12
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Here's the issue--you replace the cartridge only and you still have a 8 year old "pop-off" valve assembly; replace both and you are half way to the cost of a remanufactured, tested, warranteed dryer unit---decisions, decisions.....
PS--after taking my Bendix dryer apart, it appears to me that water is trapped in the desicant cartridge and oil is captured at the bottom or the unit via gravity and expelled via the "pop=valve". My concerns are: 1] determining how saturated the desicant cartridge is [ie cant absorb any more water]; and 2] if my dryer is spitting oil [its not by the way], where is the oil coming from and how much is too much? Replacing the cartridge will solve for the collection of water in your air tank but the oil will keep on by-passing the compressor? I am only guessing here--anyone have the facts on how dryers work?????
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Old 08-03-2014, 10:29 AM   #13
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Here is how mine works http://www.anythingtruck.com/instruc...eDataSheet.pdf
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Old 08-03-2014, 10:53 AM   #14
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Great information--my compliments on your research. My reading of the documantation tends to confirm my view point that some expelling of oil from the purger valve is normal. Excessive collection of oil in said area would tend to indicate a compressor by-pass issue.
Ultimately, the presence of oil or water in the reserve tank would indicate that either or both the desiccant cartridge and the purge valve have failed. There is quite a disparity between changing cartridge every 3 years or 300,000 miles?????? No wonder my 12 year old, 150,000 mile cartridge seems to still be working--no oil and no water on purge valve outlet or in the reserve tank.
Now that I have removed and disassembles what appears to be a perfectly good dryer, I think I will go ahead and replace the cartridge and perhaps buy a spare purge valve assembly as a back up.
PS--inital efforts to remove the spin-off cartridge from the purge assembly have been unsuccessful--need to apply more leverage I guess.
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