No air, need help

Topic: No air, need help (Read 3199 times) previous topic - next topic

Re: No air, need help

Reply #75 – April 10, 2019, 08:34:49 pm

Jerry, after not being able to get to the tanks because it sets so low, you just gave me another project to add to the list. Thanks, I kinda enjoy these projects.

David, what did the check valve change in the plumbing? When I got with my parts manager today, the vendor with the DA33100X was there. He recomended that I get the new and improved model to replace the one I had. We had some of these on the shelf. After looking at them, the plumbing was totally different. I opted to get the direct replacement. It comes tomorrow.

Larry

Re: No air, need help

Reply #76 – April 10, 2019, 08:53:51 pm

Quote from: ohsonew – April 10, 2019, 08:34:49 pm

David, what did the check valve change in the plumbing? When I got with my parts manager today, the vendor with the DA33100X was there. He recomended that I get the new and improved model to replace the one I had.

I don"t have pictures or an air line diagram handy, but I think someone posted a diagram earlier in this thread. My old dryer had two lines running from the dryer to the check valve mounted very near (essentially mounted to) the dryer. The new dryer with the internal check valve doesn't need that external valve and so I was able to "clean up" the installation by eliminating those lines and the valve and (as I recall) capping one control line running to the external valve. For me (at least) a simpler installation with fewer lines and connections is a good thing, especially since the external valve design seemed rather like a "band aid" to solve an issue that is better handled with the internal check valve design.

Re: No air, need help

Reply #77 – April 10, 2019, 09:17:28 pm

Thanks Chuck. Yep I got the external check valve, but I already have this one coming. It's worked the last 22 years, probably will outlast me.

Larry

Re: No air, need help

Reply #78 – April 11, 2019, 08:31:17 am

Quote from: ohsonew – April 10, 2019, 09:17:28 pm

Thanks Chuck. Yep I got the external check valve, but I already have this one coming. It's worked the last 22 years, probably will outlast me.

Just be sure to rebuild the air dryer (or even better replace with a factory remanufactured unit) about every 5 years.

Re: No air, need help

Reply #79 – April 11, 2019, 10:51:24 am

Quote from: D.J. Osborn – April 11, 2019, 08:31:17 am

Just be sure to rebuild the air dryer (or even better replace with a factory remanufactured unit) about every 5 years.

Does anyone have a Bendix or other manufacturer chart recommending air dryer replacement at this interval? I have charts where Bendix recommends the "Dryer Cartridge" replacement at 2-3 year intervals based on duty load. Seems a 5 year complete dryer replacement when the cartridge replacement is almost 3 years is some what conflicting.

Re: No air, need help

Reply #80 – April 11, 2019, 11:09:31 am

Swap the spin on style annually .
I found it cost/time effective to change to a modern spin on style Dryer. Took a little more on install but so far totally worth it. Parts/filters are readily available so down time is nil.

Re: No air, need help

Reply #81 – April 11, 2019, 12:00:01 pm

Quote from: Protech Racing – April 11, 2019, 11:09:31 am

Swap the spin on style annually .
I found it cost/time effective to change to a modern spin on style Dryer. Took a little more on install but so far totally worth it. Parts/filters are readily available so down time is nil.

Mike,

Do you have a part number for your new dryer? And was the plumbing compatible with your old one? (Its in my garage!!)

jk

Re: No air, need help

Reply #82 – April 11, 2019, 12:44:32 pm

100$ eBay . Had to drill mounting holes, and run the hoses a little different. NAPA stocks the cartridge . The NAPA guy acts like "they all have them ".

955205; The price came down . ;AIR DRYER ASSEMBLY - REPLACES MERITOR WABCO SYSTEM SAVER 1200 SERIES R955205...
I took it to NAPA and matched up the cartridge before I mounted it as the Ebay cartridge had no part #s on it . I also swapped it for a known good new filter after about a month . I had to mount it to remove the cartridge

tight.
The replacement cartridge cost about 60$
I show an install date of Sept 2017

While I'm showing perversions of my unit, I may as well show the Racor replacement . I called Wix asking about the GM Duramax filter GPH rating and was told that any of the 3/4 16 mounted filter will flow enough fuel for 450HP . MY OE was rated 65 GPH( 1 in mounting stub) and the GM is about the same . The shown filter has the water drain option @ 10 Micron +-.

Re: No air, need help

Reply #83 – April 11, 2019, 02:44:02 pm

As far as service interval, my recommendation is every 3 years. Yes, if you drive 70,000 miles a year, maybe every 2 years. And if you live in the desert SW maybe every 5 years.

FACTORY (by the factory that made it, not a "made to replace" reman every other dryer service. If you don't know dryer service history, start with the reman. It will have new valves, heater, etc, not just filters.

Every other service with filters only.

Re: No air, need help

Reply #84 – April 11, 2019, 03:34:10 pm

Mike,

Thanks. Your install looks good.

jk

Re: No air, need help

Reply #85 – April 12, 2019, 09:24:17 pm

Just got my new Haldex remanufactured air dryer at work today. It sure is pretty. Even comes with a new 12 v heating element. I guess I will remove the old one and keep it for a spare. I accidentally removed some of the wrong fittings from the old one so that some of the different valves were exposed. The person delivering the new one said "Keep em. Were just going to put them in the remanufacture bin and send it back to be rebuilt. They will use all new parts. "

Hope to get the time this weekend to reinstall and see if the air gets me back to the 110# range.

Larry

Re: No air, need help

Reply #86 – April 15, 2019, 09:50:15 pm

Update: couldn't get to the coach all weekend long. To many things to do. Went after work, had the air dryer reinstalled (except for the heater) in about 45 minutes. Fired up the coach, went past 30# yeah!!!!!!!!!!! Struggled to 70# and seemed to falter. OH OH. Even on high idle only 70#. Found the leak. (Don't ask me how I know where the wet tank valve is). Closed valve air went to 125# and never faltered. Let the coach idle for about 15 minutes to build the batteries. Stayed at 125#. Life is good.

Larry

Re: No air, need help

Reply #87 – April 16, 2019, 06:48:00 am

Love a happy ending!

Re: No air, need help

Reply #88 – April 16, 2019, 08:24:45 am

Congratulations Larry! So glad you got the problem resolved--and had a great "learning experience" about the systems on your coach. Even though it can sometimes be frustrating it's fun to learn more about these beautiful machines!

Re: No air, need help

Reply #89 – April 16, 2019, 09:11:12 am

With that valve open it was making the drier work harder.

Did you ever replace the isolation valve?

Re: No air, need help

Reply #90 – April 16, 2019, 07:16:52 pm

Thanks all, I feel much more confindent in my knowledge about the air system. Loved learning about it. Was able to diagnose a similar problem on the crane at work because of what I had learned.

John, I didn't replace the isolation valve. The old one seems to work well. Not really sure what it is for.

Larry

Re: No air, need help

Reply #91 – April 16, 2019, 07:22:29 pm

finally happened Got coach from storage everything works except rear air gage. turn key goes to to 30 then to 0
Everthing on coach works the way it is supposed to, even emptied the air /water valve (n0 water) What is causing gager noot to register?

Re: No air, need help

Reply #92 – April 16, 2019, 07:24:40 pm

Quote from: ohsonew – April 16, 2019, 07:16:52 pm

Not really sure what it is for.

Larry,
It was installed as a fuel saving feature. The application depended on the air compressor that was used along with several other engine options.

Mike

Re: No air, need help

Reply #93 – April 16, 2019, 07:26:16 pm

Probably a bad sending unit on the tank.

Re: No air, need help

Reply #94 – April 16, 2019, 07:27:16 pm

Dan,

Don't know for sure, but guessing with your model year coach you probably have electric air pressure gauges, as opposed to the direct reading mechanical dials on older models (like mine).

If I am correct, just like any electric gauge, check the ground wire and "signal" wire coming from the pressure sensor. Look for loose connections, damaged insulation on wire, etc.

Someone else will have to tell you where the actual pressure senders are located.

Re: No air, need help

Reply #95 – April 16, 2019, 07:33:39 pm

Quote from: Dan Stansel – April 16, 2019, 07:22:29 pm

What is causing gager noot to register?

On an '02 you may have the magic "blue/grey" (some are blue some are grey) interface box that converts the air pressure to an electrical reading. This info is then relayed to the gage making it read. This box is located under the flip up dash. If this is the type system you have you may have a bad ground or the box may be starting to fail. Once the converter/magic box fails some have just changed the gages out to direct read.

Mike
Chuck beat me to the post button but hopefully this will be of some help.

Re: No air, need help

Reply #96 – April 16, 2019, 07:36:54 pm

Thanks Mike. Any time I can save fuel you can believe I will.

Re: No air, need help

Reply #97 – April 17, 2019, 04:43:16 pm

Appears the sender may be bad. I am so dumb. How do I raise coach so I can crawl under?? Tks for ur help

Re: No air, need help

Reply #98 – April 17, 2019, 04:48:16 pm

Quote from: Dan Stansel – April 17, 2019, 04:43:16 pm

How do I raise coach so I can crawl under?? Tks for ur help

OK, first question is do you have safety stands? If not, the only safe way is to drive wheels up on boards (that support whole footprint of the tires). Basically, you need clearance so that if anything happens to the air suspension you still have safe room to crawl around.

If you have safety stands, you can use the air leveling to raise the coach (or just ride height at an axle) and install safety stands before crawling under.

And, may be nothing more than a bad (loose or corroded) connection.

Re: No air, need help

Reply #99 – April 17, 2019, 05:20:54 pm

Tks Brett will do.

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