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Topic: Bendix AD-9 Check Valve (Read 1273 times) previous topic - next topic

Bendix AD-9 Check Valve

Yesterday I took a break from my LED project.  The weather was perfect for working under our coach, so I decided it was time to install a rebuilt AD-9 air dryer that I've been carrying around with us for several months.  After enduring the obligatory session of 4-letter words and skinned knuckles, I got the old dryer out.  Carried it into my shop, where I proceeded to swap out the bottom cover fittings from old dryer to new (rebuilt) dryer.  That was when I made a interesting discovery: they have changed the design of the bottom cover.  Where the old cover had a brass check valve that installed "straight up" (vertical), the new cover has a horizontally installed valve.  The dryer cover appears to be functionally identical, and all of the air line connections screw into the same holes.  Only downside I can see is replacing the check valve (with the dryer mounted in the coach) would be more difficult.

Anyway, just thought I would give a "heads-up" to the members.  If your next rebuilt AD-9 dryer has a strange bottom cover, you will know why.

Photos of my rebuilt dryer ready to install (fitted with a brand new isolation valve).  The redesigned discharge port is at 12 o'clock on the cover.

http://www.cbsparts.ca/admin/bulletins/L55378%20Bendix%20AD-9%20Check%20Valves%205-2012.pdf

Haldex Isolation Valve
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Bendix AD-9 Check Valve

Reply #1 –
Great job Chuck,

I feel your pain.  Did you test it with your shop air compressor before installing it?

Now you can service the big air compressor!

Jerry
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Jerry and Cindy Maddux
1993 U300/36WTBI DD6v92TA
build 4271  "Miss Lou"
1995 suzuki sidekick 4x4 toad
Gulfport, Ms

"Pride of Ownership"

Re: Bendix AD-9 Check Valve

Reply #2 –
Thanks!  This is the second time I've swapped out dryers in our driveway.  The first time I had a heck of a time getting the big air lines broke loose.  They must have been installed by a big gorilla!  This time it was easier, and went pretty smooth - I was able to quickly remove them using just a 12" Crescent wrench and a short cheater.  Extracting the dryer from the mounting brackets, however, is still a royal pain in the butt.

No, I didn't bench test the dryer.  I forgot all about the Youtube video showing that procedure.  But I've already got it back on the coach, and it worked fine.

Now I need to run into town, and get my exorbitant core deposit back from the NAPA store!  8)
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Bendix AD-9 Check Valve

Reply #3 –
Quote from: Chuck & Jeannie –
Thanks!  This is the second time I've swapped out dryers in our driveway.  The first time I had a heck of a time getting the big air lines broke loose.  They must have been installed by a big gorilla!  This time it was easier, and went pretty smooth - I was able to quickly remove them using just a 12" Crescent wrench and a short cheater.  Extracting the dryer from the mounting brackets, however, is still a royal pain in the butt.

No, I didn't bench test the dryer.  I forgot all about the Youtube video showing that procedure.  But I've already got it back on the coach, and it worked fine.

Now I need to run into town, and get my exorbitant core deposit back from the NAPA store!  8)
Chuck..where is the Youtube video..??

Thx
Hans & Marjet
1995 U300 "Ben" (#4719)
3176B Cat,4060HD,Jake
SKP#139131
Motorcade#17579
2006 Honda Element (towed)

Re: Bendix AD-9 Check Valve

Reply #4 –
Quote from: Hans&Marjet –
Chuck..where is the Youtube video..?
Here it is.  Crappy video, but you can see well enough to get the idea.  Pretty simple, if you have the required air fittings and two air hoses.

http://www.youtube.com/watch?v=CpVaHnZds_Q
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Bendix AD-9 Check Valve

Reply #5 –
Thx Chuck ;D
Hans & Marjet
1995 U300 "Ben" (#4719)
3176B Cat,4060HD,Jake
SKP#139131
Motorcade#17579
2006 Honda Element (towed)