New PURest air dyer install on M923A2

those military guys have them as well for $138 on their web site

Yeah, $140 shipped is a great price. I'll be ordering one when I get the scratch. Keep 'em in stock, please.

I have a good quantity of them. They are more popular than I had thought they would be.

They would be great to add to a Deuce A2 too. My thought was if you went to a truck parts place you could spend almost 300.http://www.bigrigworld.com/bendix.html?limit=99

Bringing this one back with an update. So I have put approx. 45,000miles on my purest unit before it just started sounding like fire crackers from the pop valve. Purge was acting fine, just the pop valve. Well so I swapped it out with an older unit I had to just get me by until I get a replacement one. Let's face it, the replacement dryer costs less than the new filter kit. Well I popped it open and this is what I found. Take in mind I don't drain my tanks daily. Maybe once every other day or something where its going to sit a few days. I have not had any issues with it till now. Tried to pull the bottom purge apart and it wasn't too bad. Lots of black chunks and all inside the lower dryer unit. I may cut the filter open and look at it sometime. Keep in mind also that if in a bind you can swap lower gut parts on the dryers out with the old style.

Link to the Haldex Parts page for servicing the units.

Old Units
https://www.haldex.com/en/na/air-dr...newremanufactured/pure-air-plus-service-kits/

Purest Units
https://www.haldex.com/en/na/air-dr...haldex-newremanufactured/purest-service-kits/

draining tanks have nothing to do with it but good thing you had it there looks like worn rings in your compressor

He's right. I bet you'll find the unloader valve coked with wet carbon. (Your air compressor)
This was not the problem of the air dryer.

I also have a purest dryer.
Maybe 400 miles on it.
My pop valve just started popping when tanks are first filled with air.
After that all is normal, until next start and run.

Looked at old dryer and didnt have anythjng that looked like that stuff.

Compresser problems?

Compressor charges the system fine. Stuff may be getting by it but I can't complain. I am adding a second air compressor when I do my transmission swap. So I'll just replace the stock one then

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simp5782 said:

Compressor charges the system fine. Stuff may be getting by it but I can't complain. I am adding a second air compressor when I do my transmission swap. So I'll just replace the stock one then

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What are you needing the second compressor for?

The transmission will have its own dedicated system.

To Those who don't know what these are. It will be revealed soon enough.

Cat 7155 (x2).

They need LOTS of dedicated air!

I finally installed my new air dryer yesterday a few things I ran into, that you might want to check before you dive into your install.

-The old control line port is 1/8” NPT, the new dryer was 1/4”, luckily I had a reducer bushing on hand.

-The swivel end on the control hose was sized, and I ended up twisting the end off, but fortunately there was a coupler in the line with about 4’ of slack, and I was still able to just reach the air dryer after removing the broken section of hose. I’m going to get a new 1’ hose made, so I can get it routed back properly.

-The two top mounting bolts that came my dryer where about 3/8” to long. I used 1/2” shorter bolts that I had on hand.

Whats the part number on these dryers? I cant make it out in the pics

Lizard333 said:

Whats the part number on these dryers? I cant make it out in the pics

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N50011K

There are other dryer variants available of several driers. There is a thread on this. The purest air dryer is not commonly found as it was years ago

https://www.steelsoldiers.com/showt...TV-Air-dryer-replacements-upgrades&highlight=

I rebuilt mine on my 931 A1 and everything works great, is there a reason that you guys swap them out is it just cause it's cheaper or is there something wrong with the old one?

8madjack said:

I rebuilt mine on my 931 A1 and everything works great, is there a reason that you guys swap them out is it just cause it's cheaper or is there something wrong with the old one?

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Rebuilding the pure air dryers sometimes just doesnt work out. Lots of documented rebuilds that still have the same purge problems from the dryer

simp5782 said:

Rebuilding the pure air dryers sometimes just doesn't work out. Lots of documented rebuilds that still have the same purge problems from the dryer

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Yup and then it's swap time. Or when you find a replacement air dryer that is cheaper than a rebuild of the old unit, then it's swap time. YMMV.

Thanks guys. I think the recommended interval is once a year so I'll either just rebuild it once a year or maybe push it to once every other year since I don't drive my truck a ton.

8madjack said:

Thanks guys. I think the recommended interval is once a year so I'll either just rebuild it once a year or maybe push it to once every other year since I don't drive my truck a ton.

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Service the dryer once a year maybe is the interval. Rebuild should only occur upon failure