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In addition to nearing completion of my air brake conversion, I replaced both front inner axle seals and their retainers, new knuckle boots, degreased and cleaned the axle half shafts and the insides of the knuckles. Cleaned up and threw a coat of flat black paint on the knuckle brush guards...

Here some quick updates. Not directly pertaining to air brakes, but part of the whole sequence, I replaced both front inner axle seals with new retainers and finished installing new knuckle boots. I put the boots on last night after work and allowed the RTV to set up over night that I put on the...

This past Sunday I made a temporary discharge connection from the air compressor to the supply tank. I started to air things up and found two air leaks. -There is a small 1/8" NPT port at the top of the treadle valve against the fire wall. I did not plug that and it was gushing air. I...

Yes the part number in the link will fit the NHC250 in both M939 and M939A1 trucks. That engine only needs one installed.

Fumotos are the best. Here's the exact match for the NHC250 (has the nipple for attaching a piece of tubing to make draining oil even more neat and clean)... http://fumotousa.com/parts.php?partname=T203N&partnumber=71

Here are more pictures of plumbing completion. I got tired and left the storage yard without photographing these details. This a detail of the treadle valve primary connections that go directly into the back of valve. It consists of a 5/8" air brake X 1/2" NPT, a 1/2" NPT female-female...

Thanks for your support. It's been a lot of work, but will all be worth it. This set-up requires the hubs to be in their normal position. The furnished brake drums attach inboard from their backside to the hubs via the studs through the flange. With the hubs flipped there is nothing for the...

I am still working on my air brake conversion...got a day job, you know ;). Anyhow, I finished all the plumbing to include the cab appliances. I need a couple parts to install the air dryer to complete the air system. Last big step is to install the wedge brakes and drums on the front axle...

I did convert the standard springer base to air ride by removing the spring and replacing it with an air bag some time ago. The seat was replaced with a HMMWV type. It works really well.

I finished up all the in-cab plumbing to include a new air pressure gauge and added two low air pressure switches to the existing system. I added two low air pressure switches for both primary and secondary tanks. I used the M35 type (p/n 11621847) switches that open at 60 psi. A 1/4" brass tee...

I have pre-assembled the front LQ-4 proportioning valve. The whole assembly will mount to the crossmember under the transmission and I have made a custom bracket for this purpose. This valve will also be fed through a double check valve as are the rear brake valves. This check valve will allow...

I'm back. I got a few things done this past week. To continue my last post, I removed the parking brake valve to photograph the plumbing detail. With the parking brake brake valve installed, I turned my attention to getting all the rest of the cab appliances installed and plumbed. The treadle...

The service brake (5/8") and spring brake (1/2" red) supply lines were connected up to the primary and secondary tanks. A double check valve is installed between the secondary tank and both supply lines. The 3/8" parking brake valve supply line is also connected here with a 3/8" air brake...

Moving on with more plumbing, I also removed the air pack and master cylinder. Now obsolete, they were in the way of progress. The MC bracket is useful in routing air tubing to the primary and secondary tanks and forward to the treadle valve fittings which will be on the firewall. I removed the...

I have had photographic equipment issues, so I am lacking in new posts. I now have it fixed so I am back on track. Nonetheless, I have been busy progressing through this job. I finished plumbing the air chambers on the rear axle. I installed 45º 3/8" elbows to route the hoses neatly inward and...

Thanks for the tip. Someone else had posted that same tip elsewhere on the site. I plan to throw them in my on-board tool box.

I set the clevis on the air chambers for optimum slack adjuster operation using special templates supplied by Meritor. The instructions are on page 15 and 16 in this technical manual... I went to install the premium Meritor automatic slack adjusters I had bought thinking it would be a...

Alright, I'm back. I kept forgetting to take my camera over to the storage yard to get progress pics, but I remebered today. Last weekend, with the help of my father-in-law, I was able to get the hubs/new drums assemblies and axles back on to truck. I only put the amidships axle's inner tires...

I am not going to elaborate on bearings and seals service (excellent write up here http://www.steelsoldiers.com/showthread.php?57099-5-ton-rear-axle-seal-fix-procedure) in this thread, but I thought I would address the wiper ring (AKA speedy sleeve) service. I removed the old and installed four...

I took some air chamber mounting pics this afternoon to continue the end of my last post. I have highlighted the proper bolting orientation with the circle and arrow (Arlo Guthrie would be proud ;)).