No air, need help

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

Re: No air, need help

Reply #50 – April 07, 2019, 08:31:16 pm

It is complete ready to install keep your old one until the new one is installed to make sure you have all the fittings then turn in the core to get the core charge back.

Re: No air, need help

Reply #51 – April 07, 2019, 08:37:57 pm

Thanks Ron, will be checking on it this week. I may still bypass the old one so that I can raise it up to work on it. I barely fit under the back and there ain't no way under the front. After changing the starter last year low to the ground, if it can be raised, up she goes. And yes, I have a set of safety stands ready to stick in place.

Thanks,
Larry

Re: No air, need help

Reply #52 – April 07, 2019, 09:27:45 pm

Quote from: craneman – April 04, 2019, 11:57:43 pm

Larry, PB blaster should work. The unloader valves are spring operated and can get hung up either way. Creating high pressure or low pressure.

Larry,

If you can't get the unloaders freed up it's an easy job to replace them if you have a newer Bendix Tu-Flo 550 not a 501 like mine. You can access the valves from a cover plate on top without having to take the head off. It's a real PITA on a DD6v92 with a TU-FLO 501.

When I serviced the drier I found out the compressor would not stop building air after I bypassed it. The unloader valves were frozen and rusted shut from prior lack of service and I couldn't get them loose. I didn't notice it before because the drier was still purging. In other words, the compressor was never unloading! A new set of unloader valves did the trick and now I can hear a slight difference in engine rpms (higher) when the compressor unloads.

https://www.anythingtruck.com/product/060-107515N.html

Jerry

Re: No air, need help

Reply #53 – April 07, 2019, 09:31:09 pm

Some of us carry a double male quick connect air fitting that allows us to pressurize the wet tank (and the rest of the air system) through the tire filler hose, using a portable air compressor. You only need about 90-100 psi in the tanks to fully inflate the air bags to max lift.

The main objection to this procedure is that you are using "wet" air to pressurize the system. But if you are going to bypass the dryer, it is the same difference. Would save you some work, and having to run the big engine.

Re: No air, need help

Reply #54 – April 07, 2019, 09:32:05 pm

Thanks Jerry, one more thing to keep in mind after I bypass and it doesn't stop. By servicing your dryer, what did you have to replace?

Larry

Re: No air, need help

Reply #55 – April 07, 2019, 09:34:53 pm

Chuck, I wish I could but the coach is in a storage yard with the closest electricity 1/2 mile away. I thought of an air bubble to do that, but would probably tak a dozen trips to get it up and the coach is 20 miles away

That is one of the reasons this is taking so long, as well as that work thing.

Larry

Re: No air, need help

Reply #56 – April 07, 2019, 09:38:32 pm

Quote from: ohsonew – April 07, 2019, 09:34:53 pm

Chuck, I wish I could but the coach is in a storage yard with the closest electricity 1/2 mile away.

Start the generator and use the coach 110V outlet to power the compressor. Genny probably needs exercise anyway.

Re: No air, need help

Reply #57 – April 07, 2019, 10:13:11 pm

Quote from: ohsonew – April 07, 2019, 09:32:05 pm

Thanks Jerry, one more thing to keep in mind after I bypass and it doesn't stop. By servicing your dryer, what did you have to replace?

Larry

I still have the Bendix AD-4 outdated drier but was able to find a new cartridge and a rebuild kit that has the seals, purge valve, etc. at the local big truck parts store here for about $150. Didn't need any new fittings or bracket with the old case. The replacement models are much better and easier to service. The kit comes with instructions. The hardest part was getting it out!

Jerry

Re: No air, need help

Reply #58 – April 07, 2019, 10:14:09 pm

Yes, a FACTORY (as in the factory that made it, not someone elses reman) comes with all new valves, heater and filters.

THAT is the way to go, particularly if you don't know how old the air dryer is or what shape of everything inside.

Another option if you have an obsolete dryer (Bendix AD-4 comes to mind) is to contact the factory that made your dryer and ask what supercessions are exact replacements (connect exactly the same as the old one). Been there, done that.

Re: No air, need help

Reply #59 – April 08, 2019, 08:48:18 pm

Chuck, I would like to start the genny but the fuel lines started sucking air so the genny quit running. Got a small piece of new line and fed from fuel can, ran like a top. I had planned on replacing the fuel lines all around this past winter, but with work and the worst winter we've had in years, didn't happen.Once the air problem is resolved, it's back on the fuel lines.

Jerry, I have the Haldex dryer. I have checked with our parts manager at work and he has located a reman haldex for about $200 + core. The best I could find online was $250 + core. I have made up a bypass fitting and will try to install tomorrow after work. Once there, I will remove the core, get the new one and put back in.

Larry

Re: No air, need help

Reply #60 – April 08, 2019, 09:09:42 pm

Quote from: ohsonew – April 08, 2019, 08:48:18 pm

I have the Haldex dryer. I have checked with our parts manager at work and he has located a reman haldex for about $200 + core. The best I could find online was $250 + core. I have made up a bypass fitting and will try to install tomorrow after work. Once there, I will remove the core, get the new one and put back in.

Be sure that you have the exact replacement for your air dryer. They come in different varieties, and so it's important to get the exact match.

Re: No air, need help

Reply #61 – April 08, 2019, 09:23:31 pm

David, the manufacturers spec sheet calls for DA3100X. That is what was quoted. Are you saying there are different versions of this model number?

Re: No air, need help

Reply #62 – April 08, 2019, 09:50:58 pm

Quote from: ohsonew – April 08, 2019, 09:23:31 pm

David, the manufacturers spec sheet calls for DA3100X. That is what was quoted. Are you saying there are different versions of this model number?

The spec sheet is probably--emphasis on probably--correct. I just don't really trust spec sheets and so I would carefully compare the old and the remanufactured units to be certain.

Re: No air, need help

Reply #63 – April 08, 2019, 10:08:04 pm

Larry, as long as the model # is the same make sure all your fittings fit your golden. You can even change manufactures they all do the same thing. Just a matter of connections. I like the Haldex dryers better than Bendix units.

Re: No air, need help

Reply #64 – April 09, 2019, 07:35:32 am

Quote from: ohsonew – April 08, 2019, 09:23:31 pm

DA3100X.

Larry,
That is the correct number. Make sure you remove all the fittings off the old one before you return it for core.

Mike

Re: No air, need help

Reply #65 – April 09, 2019, 11:14:40 am

Quote from: ohsonew – April 08, 2019, 08:48:18 pm

I have checked with our parts manager at work and he has located a reman haldex for about $200 + core.

Got a link to it Larry?

Re: No air, need help

Reply #66 – April 09, 2019, 09:01:39 pm

Thanks to all of you. I have looked at the website for as much info as I can as well as what was supplied with the coach manuals. Actually impressed with what they show in there.

OK, here is where I'm at. Went to the coach to try to bypass the hoses. Brought a set of connectors in both 1/2" and 5/8" brass air hose fittings. Wasn't even close to big enough. It looks like it is about a 1" fitting that would be needed.
Since I couldn't bypass it, I did the next best thing. I removed it and brought it home. I will take it to work tomorrow and get the new one on the way. Don't know if I will have it tomorrow or the next day. I still have the 2 large fittings to remove from the dryer, but I can get that done at the shop. It took me less than 1/2 hr to remove. Hopefully the reinstall won't be much longer.

Thanks again for the support and advice, I will keep you posted.

Larry

Re: No air, need help

Reply #67 – April 09, 2019, 09:21:16 pm

Larry,
Those fittings are probably 37º JIC fittings often used in hydraulics systems, not like the DOT air brake fittings used by FOT with the HTFL Polyamide fuel line. If you remove the two large fittings form the dryer, they are probably ½ male pipe thread on the air dryer side and JIC (I forget the size designation) on the other. You can make a bypass with those two fittings using an ordinary ½ female pipe thread coupler. You will probably still have to plug or cap a small ¼" air line so that the cut off functions (at least I did). You can also take those to JIC fittings from the dryer and take them to a hydraulics shop to match them up so you can have a bypass kit already made up for future issues, which probably won't happen if you have the kit with you.

Don

Quote from: ohsonew – April 09, 2019, 09:01:39 pm

Thanks to all of you. I have looked at the website for as much info as I can as well as what was supplied with the coach manuals. Actually impressed with what they show in there.

OK, here is where I'm at. Went to the coach to try to bypass the hoses. Brought a set of connectors in both 1/2" and 5/8" brass air hose fittings. Wasn't even close to big enough. It looks like it is about a 1" fitting that would be needed.
Since I couldn't bypass it, I did the next best thing. I removed it and brought it home. I will take it to work tomorrow and get the new one on the way. Don't know if I will have it tomorrow or the next day. I still have the 2 large fittings to remove from the dryer, but I can get that done at the shop. It took me less than 1/2 hr to remove. Hopefully the reinstall won't be much longer.

Thanks again for the support and advice, I will keep you posted.

Larry

Re: No air, need help

Reply #68 – April 09, 2019, 09:24:23 pm

While back I did a thread about bypassing the dryer. Link to one of the posts below - shows what parts I needed for the dryer on our coach.

Air Dryer Bypass Demo

I also carry a set of JIC plugs of various sizes in my tool kit. They are handy for plugging air and/or hydraulic hoses. See post:

Emergency bypass kit for Haldex air dryer

Re: No air, need help

Reply #69 – April 09, 2019, 09:49:13 pm

Chuck, I printed out that write up you did. It helped me tremendously. Thanks.

Don, I will go ahead and make up a bypass just to have for an emergency for me or someone else. I still have to remove the 2 large fittings at the shop tomorrow, but I will check on the 1/2" pipe thread, we have lots of 1/2" pipe, The only thing that surprised me was the small fittings. On 1 side was a Tee fitting with one hose going up towards the front somewhere (didn't trace) the other going around the air dryer to another large fitting which had the air supply hose, and a small plastic line with a compression fitting (heading up front also). Is this large device some sort of solenoid or what?

If I knew how to post pictures from my phone, but alas I don't have one of my 12 year old grand kids here to show me the way.

I wasn't sure how much of the fittings needed to come off, so I hope to find out tomorrow.

Larry

Re: No air, need help

Reply #70 – April 09, 2019, 09:56:07 pm

Quote from: ohsonew – April 09, 2019, 09:49:13 pm

Is this large device some sort of solenoid or what?

You might be looking at the isolation valve. See thread linked below:

Pure Air Plus Air Dryer

Re: No air, need help

Reply #71 – April 09, 2019, 10:58:59 pm

The isolation valve does NOT come with the reman,found one on Ebay.

Re: No air, need help

Reply #72 – April 10, 2019, 05:57:22 am

Thanks Chuck & John. I was to tired last night to remember what it was called. I remember from your link reading about it.

Larry

Re: No air, need help

Reply #73 – April 10, 2019, 10:45:49 am

Quote from: Chuck & Jeannie – April 07, 2019, 09:31:09 pm

Some of us carry a double male quick connect air fitting that allows us to pressurize the wet tank (and the rest of the air system) through the tire filler hose, using a portable air compressor. You only need about 90-100 psi in the tanks to fully inflate the air bags to max lift.
The main objection to this procedure is that you are using "wet" air to pressurize the system. But if you are going to bypass the dryer, it is the same difference. Would save you some work, and having to run the big engine.

Yes, I have one of those and occasionally use it. After using it I haven't noticed any more water than usual when draining the tanks. Everyone drains the tanks after a days driving, right!!! The main purpose of the dryer is too prevent ice in the brake lines during freezing weather. Most of us don't drive in freezing weather. Anyway after a little bit of driving that air will be exhausted and replaced by air from the dryer. A few years ago I moved the drain valves on the front tanks to an easy to reach spot, so I didn't have to crawl under the coach to do that. Similar to the drain on the wet tank.

Re: No air, need help

Reply #74 – April 10, 2019, 11:44:33 am

I don't wsnt to add to the confusion but this discussion jogged my memory and when my dryer failed about 3 years ago I replaced it with a unit containing the built-in check valve. I believe the unit I used was the Haldex DA33200X. This simplified the plumbing and eliminated the need to purchase an replacement valve.

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