Haldex / Midland Check Valve Rebuid Kit

Topic: Haldex / Midland Check Valve Rebuid Kit (Read 3145 times) previous topic - next topic

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #25 – June 05, 2017, 10:30:40 am

Rebuilt my drier last year and used the TWO main kits to rebuild it,this included the purge valve which really needed rebuilding.
Also replaced the check valve on the side of the drier,(don't mean relief valve).Next time will probably get the reman but I now
know how to rebuild.

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #26 – June 05, 2017, 01:22:22 pm

This thread has me curious about what is a good maintenance schedule for our motorhome air dryers.

I found references to Bendix recommendations like:
For severe service applications, such as residential refuse trucks or school buses, the air dryer cartridge should be replaced every year or 100,000 miles.
Line haul operations using a single trailer should swap the filter out every three years or 300,000 miles.

So severe service recommendation is 100,000 miles and line haul is 300,000 miles, while motorhome use would be gentle service in comparison, such that servicing the Bendix air dryer every 10 years (50,000 miles for me) would suffice.

I wonder if every Foretravel owner who has rust damage inside the air lines has a Bendix air dryer which has not been serviced for ten or more years, or has bad leaks such that the Bendix dryer is always being used to replenish the leaked air.

When I serviced my Bendix dryer four years ago, the old one looked clean and new. Also, I have never seen moisture coming from any of my tank drain valves, not even the wet tank.

I am thinking, five years or 50,000 miles as a service interval would be sensible while never ignoring obvious air leaks.

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #27 – June 05, 2017, 01:45:44 pm

Quote from: P. Wyatt Sabourin – June 05, 2017, 01:22:22 pm

I am thinking, five years or 50,000 miles as a service interval would be sensible while never ignoring obvious air leaks.

X2...The same advise was given to me by the PO (who's initials are B.W.).

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #28 – June 06, 2017, 08:39:35 am

While our issue seems to be more one of rust than desiccant powder, after reading many posts including Mike's reply #12 in this thread, Desiccant in air system, we decided to replace all 4 air tanks. They are on the way from FOT.

In this thread, 2003 U320 - Phase 3 of Desiccant Powder Cleanup, Jim recommends blowing out the lines with high pressure air. We'll do that too.

We have a new Haldex dryer that will go in this week -- time and weather permitting -- and our aux air system is tuned up and running well. We also plan to replace the protection valves on both the front and rear tanks and the 2-way check valve on the front tank while we have the tanks out. These OEM DOT-rated parts are cheap and will never be easier to get to than when the tanks are out.

What other recommendations would everyone offer prior to reassembling with the new tanks?

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #29 – June 06, 2017, 11:27:03 am

Quote from: Mark Duckworth – June 06, 2017, 08:39:35 am

What other recommendations would everyone offer prior to reassembling with the new tanks?

Sounds like you've got it pretty well covered. One thing you might check - see if your Haldex drier is fitted with a "isolation valve". If so, you might as well go ahead and replace it also. It is not included with a new or rebuilt drier. Shop around for the best price.

KN23500 by HALDEX - Isolation Valve

Photo below of the last AD-9 I installed on our coach. Since your coach is newer, it might not have this valve.

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #30 – June 06, 2017, 11:32:32 am

Wyatt, I can understand your thinking but as the replacement of the dryer is such a small outlay of money and trouble, I, in all honesty think that when all other things are taken into consideration (ie problems associated with a faulty Dryer) it would be foolish to put this one item of maintenance on the "back burner" for so long.
Even for someone who has to pay a shop to replace it, this cost is equal to a tank of fuel. Is leaving it in, and hoping after 3 yrs that it does not give you grief while on a road trip really worth the saving? When you factor in all the other things we have to maintain on a coach, this one for me is minor, but piece of mind is big.
JohnH

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #31 – June 06, 2017, 11:56:45 am

Quote from: Chuck & Jeannie – June 06, 2017, 11:27:03 am

Sounds like you've got it pretty well covered. One thing you might check - see if your Haldex drier is fitted with a "isolation valve". If so, you might as well go ahead and replace it also. It is not included with a new or rebuilt drier. Shop around for the best price.

KN23500 by HALDEX - Isolation Valve

Photo below of the last AD-9 I installed on our coach. Since your coach is newer, it might not have this valve.

Chuck,

Thanks I will check to see if there is one. I see the part numbers for it on Barry's site.

Your post led me to read more about Haldex dryers and I see that there are several model number variants. The one I picked up on eBay is a model DA33100X. I'm wondering if this the correct one for my coach?

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #32 – June 06, 2017, 12:08:55 pm

Quote from: Mark Duckworth – June 06, 2017, 08:39:35 am

While our issue seems to be more one of rust than desiccant powder, after reading many posts including Mike's reply #6 in this thread, Desiccant in air system, we decided to replace all 4 air tanks. They are on the way from FOT.

In this thread, 2003 U320 - Phase 3 of Desiccant Powder Cleanup, Jim recommends blowing out the lines with high pressure air. We'll do that too.

We have a new Haldex dryer that will go in this week time and weather permitting, and our aux air system is tuned up and running well. We also plan to replace the protection valves on both the front and rear tanks and the 2-way check valve on the front tank while we have the tanks out. These OEM DOT-rated parts are cheap and will never be easier to get to than when the tanks are out.

What other recommendations would everyone offer prior to reassembling with the new tanks?

Mark,

Judging by all the rust you found so far in the system you might want to consider doing some maintenance work on the big air compressor. It's usually overlooked and can be a source for internal air leaks and other problems if the inlet, discharge, or unloader valves aren't working properly. When I serviced mine I found the unloader valves were rusted shut and the compressor wasn't unloading and overworking the compressor. Unfortunately I have a Bendix Tu-Flo 501 and had to remove the head to replace the unloader valves. At that point I found the inlet and discharge valves and springs were rusted so I bought a field maintenance kit and replaced them also.

If you have a Bendix Tu-Flo 550 or later model you can replace the unloaders without removing the head which is a royal PITA on a DD6v92. You can also run a leak test with a shop compressor. Chuck inspired me to work on my air system tank valves and drier and that's when I discovered the unloader problem. After all that maintenance work I now have nothing but clean dry air in all three tanks and my compressor builds air more quickly and cycles less frequently.

Here's an excellent instructional video from Bendix on compressor maintenance.

Jerry

https://www.youtube.com/watch?v=VeyFaEP8FKA

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #33 – June 06, 2017, 12:20:44 pm

Quote from: Mark Duckworth – June 06, 2017, 11:56:45 am

Your post lead me to read more about Haldex dryers and I see that there are several model number variants. The one I picked up on eBay is a model DA33100X. I'm wondering if this the correct one for my coach?

Mark,

For a 2003, DA33100X is the correct number for the Haldex reman'd unit yours uses. Now, as for purchasing on eBay, be SURE that unit is reman'd by Haldex, not just any shop or person. That particular number should correspond to a factory reman, but you never know.

NAPA is a good place to get the DA33100X. Core charge is about $100. You get that back when you turn in your old air dryer. Recommend NOT turning it in until you're done installing the new one since you'll need to harvest the fittings from it.

Jim McNeece did a cost comparison a couple of years ago that showed little difference between doing both a major and minor service kit rebuild and getting a Haldex reman from NAPA.

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #34 – June 06, 2017, 12:37:04 pm

Quote from: coastprt – June 06, 2017, 12:08:55 pm

Judging by all the rust you found so far in the system you might want to consider doing some maintenance work on the big air compressor...

Here's an excellent instructional video from Bendix on compressor maintenance.

Jerry

Jerry,

Thanks for the info and the link. I've no idea yet what compressor I have but will dig into it. The video should be super helpful!

Quote from: Michelle – June 06, 2017, 12:20:44 pm

For a 2003, DA33100X is the correct number for the Haldex reman'd unit yours uses.

Michelle,

Thanks. I got lucky! The one I purchased is actually a NOS not a reman, but since I plan on changing this puppy out regularly I appreciate the info. The forum jury seems to still be out on how often to change out the dryers but there does seem to be agreement that it's pretty cheap insurance, all things considered!!

Quote from: Chuck & Jeannie – June 06, 2017, 11:27:03 am

Sounds like you've got it pretty well covered. One thing you might check - see if your Haldex drier is fitted with a "isolation valve". If so, you might as well go ahead and replace it also. It is not included with a new or rebuilt drier. Shop around for the best price.

Chuck,
I just went out back and looked and I do not have an isolation valve. I see some discussion on the forum as to whether an isolation valve is needed or beneficial on the all coach models. Any thoughts on this?

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #35 – June 06, 2017, 12:42:35 pm

Quote from: Michelle – June 06, 2017, 12:20:44 pm

NAPA is a good place to get the DA33100X. Core charge is about $100. You get that back when you turn in your old air dryer.

If you are full time, and moving around while doing the drier replacement procedure, be careful about the core charge thing. On our last trip to Oregon, I purchased a reman AD-9 at a NAPA store along the way (in Price, Utah) cuz they had them on sale. The owner of the store was working the desk. I asked if I could return the old (core) drier to any NAPA store, because I was not planning on replacing it right away. He said sure, no problem, as long as you have the receipt any store will take it.

Fast foreward - I finally got around to doing the switch when we got home to Midland, TX. Took the core down to the local NAPA store, and boss man gave me a bunch of grief about taking the core. Said he is only "supposed" to take cores for stuff HE sells out of HIS store. I asked aren't all NAPA stores part of the same company. He says no, they are actually more like individually owned stand-alone part stores that just pay to use the NAPA name and parts distribution network. That was news to me!

Anyway, bottom line he finally took the core and gave me my deposit, so no harm done. Just saying, probably better to return the core to the same store where you buy the reman unit.

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #36 – June 06, 2017, 12:45:10 pm

Quote from: Mark Duckworth – June 06, 2017, 12:37:04 pm

Chuck,
I just went out back and looked and I do not have an isolation valve. I see some discussion on the forum as to whether an isolation valve is needed or beneficial on the all coach models. Any thoughts on this?

No. In fact, I don't really even understand what the isolation valve does. It's above my pay grade.

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #37 – June 06, 2017, 12:54:17 pm

Quote from: Chuck & Jeannie – June 06, 2017, 12:45:10 pm

No. In fact, I don't really even understand what the isolation valve does. It's above my pay grade.

Same here. From the little I've read so far, it's apparently a form of a check valve.

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #38 – June 06, 2017, 01:07:45 pm

I bought my rebuilt Haldex at a NAPA store in New Hampshire where there is no sales tax. When I returned here to Tennessee and installed it I returned the core to my local NAPA store where they refunded me the core charge plus the $9.25 sales tax they would have charged if purchased from them.

When I queried them about it the manager told me he had to do it by law.

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #39 – June 06, 2017, 02:18:16 pm

Mark,

Do you have the link on ebay for the dryer your purchased? I see recondition ones...

Thanks

Charlie

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #40 – June 06, 2017, 02:30:18 pm

Quote from: Charlie G – June 06, 2017, 02:18:16 pm

Mark,

Do you have the link on ebay for the dryer your purchased? I see recondition ones...

Thanks

Charlie

Hey Charlie.

Here ya go: Haldex DA33100X Air Dryer No OE Box | eBay

This is what eBay shows when I click on my purchase history. This link leads to one that says both re-manufactured and NIB (new in box). The one I received came in a random box but appears to be NOS (new old stock).

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #41 – June 06, 2017, 05:11:16 pm

Richard barks records showed him replacing the air dyer stuff just prior to our stewardship.

Last winter I had the cummins shop rebuild ours. Five years.

30 k miles. No issues seen

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #42 – June 06, 2017, 11:24:41 pm

Like others I did the re manufactured unit from Napa and will change filter at 12 months then another reman unit at 24months .
Cheap insurance

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #43 – June 07, 2017, 05:29:11 pm

When I researched the isolation valve I remember reading that it helped the air compressor run less/unload easier so I changed
mine.Think that info was from Cummins.

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #44 – June 07, 2017, 06:06:48 pm

Quote from: John44 – June 07, 2017, 05:29:11 pm

When I researched the isolation valve I remember reading that it helped the air compressor run less/unload easier so I changed
mine.Think that info was from Cummins.

After reading BJ Holden's reply #12 in Haldex air dryer isolation valve, I'm pretty convinced that since we have a 2003 coach, we do not need to add an isolation valve (IV). BJ lays out the compressor / dryer combinations that need the IV and also the back story.

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #45 – June 08, 2017, 05:15:51 am

Quote from: Michelle – June 06, 2017, 12:20:44 pm

Mark,

For a 2003, DA33100X is the correct number for the Haldex reman'd unit yours uses.

Michelle,

Are you saying that the DA33100X actually indicates that is has been remanufactured as opposed to NOS?

Mark

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #46 – June 08, 2017, 09:36:51 am

Quote from: Mark Duckworth – June 08, 2017, 05:15:51 am

Michelle,

Are you saying that the DA33100X actually indicates that is has been remanufactured as opposed to NOS?

That's my understanding. Pamela and Mike are likely to know for sure. (and T-man found the info as well

)

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #47 – June 08, 2017, 09:43:47 am

I looked on the Haldx website and cannot find a new Pure Air Plus.
They are all remans.

Pure Air Plus™ Air Dryer - Haldex product category

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #48 – June 08, 2017, 10:15:33 am

Quote from: Travelin' Man – June 08, 2017, 09:43:47 am

I looked on the Haldx website and cannot find a new Pure Air Plus.
They are all remans.

Pure Air Plus™ Air Dryer - Haldex product category

Might check Ebay though they all seem to be remans. I just got one for 200.00, no shipping, tax. genuine part at least it was represented as such and appears to be in a factory box.

Re: Haldex / Midland Check Valve Rebuid Kit

Reply #49 – June 08, 2017, 11:05:05 am

Not Chuck, but from what I have been able to glean the isolation valve is only necessary for use with Holset compressors used in the unicoaches until circa 2000 model year. Our coach which has an ISC has the Holset. In any case, it does have an isolation valve.
Don

Quote from: Mark Duckworth – June 06, 2017, 12:37:04 pm

Chuck,
I just went out back and looked and I do not have an isolation valve. I see some discussion on the forum as to whether an isolation valve is needed or beneficial on the all coach models. Any thoughts on this?

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