Haldex PURest™ Air Dryer upgrade

[MatthewWBailey]

There's a few threads on this going back to a previous era in human history. But I distilled that this PURest dryer is the upgrade to do. (I still have the original A1 unit).
So Just a clarification, there's only 2 part numbers with a 24v heater. Do I want the left hand port or right hand port? DA34110 or DA34310

 

[GeneralDisorder]

Get one of these - they are surplus units that are brand new but were sent to surplus due to having the older 150 psi relief valve. These come with the mounting bracket that matches the holes in your frame. It's a super easy swap.

MRAP M-ATV Haldex N50011H Purest Air Dryer 24 VOLT 12423171 4730015247892 | eBay

MRAP M-ATV Haldex N50011H. NSN: 4730015247892. Purest Air Dryer.

www.ebay.com

And here's the "new" 175 psi relief valve:

Haldex N1178EE Air Brake Reservoir Pressure Relief Valve + Cross Reference | FinditParts

Haldex N1178EE Air Brake Reservoir Pressure Relief Valve - 3/8" Thread Size, 175 PSI ✓ Order now for same-day shipping on eligible purchases from FinditParts.com, America's online marketplace for heavy duty parts.

www.finditparts.com

It takes 20 seconds to swap it.

And yeah - it's the exact same dryer used in the FMTV (and various MRAP applications including the M-ATV that uses the 370 HP C7). I have one from this seller on my truck due to mine having a factory casting flaw (on the secondary 235psi valve seat) that I detailed in another thread.

 

[MatthewWBailey]

Get one of these - they are surplus units that are brand new but were sent to surplus due to having the older 150 psi relief valve. These come with the mounting bracket that matches the holes in your frame. It's a super easy swap.

MRAP M-ATV Haldex N50011H Purest Air Dryer 24 VOLT 12423171 4730015247892 | eBay

MRAP M-ATV Haldex N50011H. NSN: 4730015247892. Purest Air Dryer.

www.ebay.com

And here's the "new" 175 psi relief valve:

Haldex N1178EE Air Brake Reservoir Pressure Relief Valve + Cross Reference | FinditParts

Haldex N1178EE Air Brake Reservoir Pressure Relief Valve - 3/8" Thread Size, 175 PSI ✓ Order now for same-day shipping on eligible purchases from FinditParts.com, America's online marketplace for heavy duty parts.

www.finditparts.com

It takes 20 seconds to swap it.

And yeah - it's the exact same dryer used in the FMTV (and various MRAP applications including the M-ATV that uses the 370 HP C7). I have one from this seller on my truck due to mine having a factory casting flaw (on the secondary 235psi valve seat) that I detailed in another thread.

Thank you kindly.

 

[simp5782]

Go with an AD9 unit. They are more common and cheaper to find parts for locally. Purest units are decent but discontinued years ago for the most part.

 

[GeneralDisorder]

The Bendix AD9 is cheaper with many Chinese knock offs on the market as well. It has a lower SCFM rating, and only a single desiccant type. Servicing it will require removing if from the truck and is at least a 45 minute to 1 hour job.

The PURest dryer has a five stage desiccant cartridge, has higher SCFM capacity, and servicing it is done on the truck and takes about 10 minutes (if that).

The military specified it for reasons. Yes it's more expensive. It's also better and faster to service.

Both can work. The PURest is common in the surplus world and thus isn't much difference in price vs. a non-Chinese AD9. And NAPA has the PURest dryer cartridges as well as any fleet supply. It's not uncommon on trucks and RV coaches, etc so I wouldn't be worried about finding parts for it.

 

[MatthewWBailey]

There's 1 on bay and I lasso'd it, and the 175 relief. Seems like there are lots of options for these devices across commercial trucking, but I'm tired of drilling new holes and fabricating brackets. Plug and play would be a welcomed change. I'm fresh out of bracket-manufacturing-energy after this exhaust reroute job.

 

[hike]

By the time I looked, all gone =/

Perhaps next time—

 

[MatthewWBailey]

By the time I looked, all gone =/

Perhaps next time—

Sorry! I didn't know!

 

[Skyhawk13205]

Call me colt has a good video of the install, when I put mine in I had trouble with the braided steel line, I have the arctic heater kit so the unit is in front of it and it was hard to access.

 

[hike]

Sorry! I didn't know!

All good—