M939/LMTV/FMTV Air dryer replacements/upgrades

simp5782 said:

Or
@SCM35A2

Military NOS Truck Haldex Midland Purest Air Dryer Drier N50011K 24 Volt Da34100 for sale online | eBay

Find many great new & used options and get the best deals for Military NOS Truck Haldex Midland Purest Air Dryer Drier N50011K 24 Volt Da34100 at the best online prices at eBay! Free shipping for many products!

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Thanks bud, life saver for sure! Going to get 2 of these, never hurts to have spares!

Guys I just installed my SKF Turbo 2000 over the weekend. Works great but I am thinking the Air Dryer mounts might be different between trucks as mine was not a direct bolt on. Here is what happened: Had to drill 2 more holes as the mounting bracket holes are narrower than the stock holes. I needed to get some fittings as only one actually worked was the 1/2 elbow to from dryer to Wet Tank. Here is a quick list of fittings needed: (1) 1/4" to 1/8" reducer for line from Governor (little line), (1) 3/8" pipe plug (To plug the Purge port), (1) 1/2 to 1/2" female to female adapter (For Inlet), (1) 1/2" female to male (for inlet). I had to flip the mount from front to rear so I wouldn't have to make a longer inlet line. My line going from the wet tank to the dryer was about 1.5" too short so I needed to make another one. All in all, I am very happy and was not a very hard install once the fittings were figured out. Hope this helps everyone looking to make the change.

SCM35A2 said:

I want one of these, but haven't been able to find one! Anybody got a link/source to purchase one??

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I just bought one off EBAY last week. Was that suppliers last one.

Pardon my ignorance, but what are the advantages from going from the haldex pure dryer to the haldex purest dryer? Are parts just getting harder to get on the older air dryers? Thanks

I got one from NAPA here for 250.00.

Russ Knight said:

I got one from NAPA here for 250.00.

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Did you make sure it was for an Holset compressor? There are 2 versions. One is for holset. One is for non holset

simp5782 said:

Did you make sure it was for an Holset compressor? There are 2 versions. One is for holset. One is for non holset

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I did not. Maybe I’ll get lucky.


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Hi, simp5782 I think you can help me: can the Haldex air dryer with the code N50011K be mounted on the LMTV M1078 A0?
Thanks

Lifeson said:

Hi, simp5782 I think you can help me: can the Haldex air dryer with the code N50011K be mounted on the LMTV M1078 A0?
Thanks

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Yes

What's the different with the code N50011H?

Howdy. Im in the market for an air dryer for my lmtv. My unit came without the dryer so im out of commision for now. Skf brakemaster 2000 is preffered but ebay is all out. Anyone have a spare to sell?

jmenende said:

Howdy. Im in the market for an air dryer for my lmtv. My unit came without the dryer so im out of commision for now. Skf brakemaster 2000 is preffered but ebay is all out. Anyone have a spare to sell?

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Use an AD9 air dryer. It's common commercial




Not sure if the heater is 24v or not if it is then you will have to swap the heater unit

simp5782 said:

Use an AD9 air dryer. It's common commercial

Air Dryer-12 VOLT 12V-AD-9 AD9 Assembly Replacement for Bendix 065225/109685 | eBay

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Not sure if the heater is 24v or not if it is then you will have to swap the heater unit

MOHAWK MANUFACTURING 24V PURGE VALVE FOR BENDIX AD-9 AIR DRYER~G1012638-1 | eBay

Find many great new & used options and get the best deals for MOHAWK MANUFACTURING 24V PURGE VALVE FOR BENDIX AD-9 AIR DRYER~G1012638-1 at the best online prices at eBay! Free shipping for many products!

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Im not going to connect the heater. Im in PR and its always hot.
Thanks for the help, im trying to get this rig rolling.

I recently saw some surplus air dryers come up for sale with a slightly different model number - 50011P. I hadn't seen them mentioned here so I thought I'd post the information I found.

From the link below - it sounds like the relief valve opens at a different pressure than the old one.

https://www.psmagazine.army.mil/News/Article/3093675/fmtv-replacement-nsn-for-air-dryer/

Good evening. I am in the process of replacing the air dryer on my volunteer fire departments brush truck (M923A1). I had a shop replace my air dryer a few years ago and they used a WABCO 1200 series. My truck is stored about 35 minutes from where I live so I cant look at my current unit. I am tied between finding a SKF Brakemaster 2000 but they seem hard to find or going with the Haldex or an AD-9. I found a link for this Hadlex in stock. Would this be a proper unit for our trucks? What is the deal with the Holset compressors? Our trucks have a Holset compressor? Any and all help is appreciated.
(Both my truck and the fire department brush trucks are M923A1's running 14's super singles)

Haldex Unit I found:

SKF I found but had to email them for availability:

AD9 I found and believe would be the proper unit: (Could only find the extended purge one that was a new unit and not re-manufactured)

WABCO unit I think I would be proper if I choose this route:
(I can only use this unit if I have access to drill and tap a hole for a certain thread? which I do not have the ability to do this)

Any and all assistance is very much appreciated. Thanks

( @simp5782 )

The AD9 with the 24v heater swap would be the easiest thing to do.

You can drill the holes for the mounting plate with a hand drill pretty easy.

Okay, Thanks. Is this unit okay then? Does the extended purge have any negative effect? I really appreciate the assistance.

Iron Moose 5 Ton said:

Okay, Thanks. Is this unit okay then? Does the extended purge have any negative effect? I really appreciate the assistance.

Bendix 065227 AD-9EP Extended Purge Air Dryer, 3/4" NPT, 24V (Special Order)

Check out the deal on Bendix 065227 AD-9EP Extended Purge Air Dryer, 3/4" NPT, 24V (Special Order) at AnythingTruck.com, Truck & Trailer Parts and Accessories Warehouse

www.anythingtruck.com

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Go with this

Okay. Thank you very much for the assistance. So for the M923A1 is the truck a Holset style compressor or no? That link you posted does not say if its compatible with E-Holset compressor's or not. I am under the impression I need a Holset compatible dryer. (ie 4 line dryer with positive back pressure, compared to a 3 line dryer).

Iron Moose 5 Ton said:

Okay. Thank you very much for the assistance. So for the M923A1 is the truck a Holset style compressor or no? That link you posted does not say if its compatible with E-Holset compressor's or not. I am under the impression I need a Holset compatible dryer. (ie 4 line dryer with positive back pressure, compared to a 3 line dryer).

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You only need a 3 line dryer. Inlet. Outlet. Purge. It'll work ive ran em for years.