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Old 10-03-2015, 08:29 AM   #1
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Air system maintenance

I had my air dryer cartridge replaced when we first got the Allure in spring 2013. I've never had any water come out of the flush valves so figured I would stretch the air dryer service interval to 3 years.

What are most of you doing for that? I've read posts where some folks replace the purge valve when they change out the cartridge. Also, what about the air compressor? I never did anything to that on my previous coach in 11 years so wonder if there is any recommended or suggested PM on the compressor.
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Old 10-03-2015, 08:42 AM   #2
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Originally Posted by smlranger View Post
I had my air dryer cartridge replaced when we first got the Allure in spring 2013. I've never had any water come out of the flush valves so figured I would stretch the air dryer service interval to 3 years.

What are most of you doing for that? I've read posts where some folks replace the purge valve when they change out the cartridge. Also, what about the air compressor? I never did anything to that on my previous coach in 11 years so wonder if there is any recommended or suggested PM on the compressor.

Most of my travels are in the humid southeast. I've been on a 3 year maintenance cycle for going on ten years now. Never any moisture showing when draining air. My dryer is a Meritor Wabco.


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Old 10-03-2015, 11:29 AM   #3
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Just did my Air Dryer after 7 years.

No symptoms, just my comfort zone.
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Old 10-04-2015, 12:02 AM   #4
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after 15 years, no records of air dryer ever being serviced and no symptoms. got it done two months ago just for the sake of replacing it. maybe because the coach had always been in west coast?
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Old 10-04-2015, 10:14 AM   #5
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I researched the heck out of this when moving from gasser to DP - last thing I wanted was any problems with air brakes when running down a grade! Steve pointed out an important factor that has an influence on how frequently to do the air cartridge replacement - where you travel, and the amount of humidity makes a difference.

We're mostly West side of the country, so I elected to do a every four year cartridge cycle. Ours is due now, and while in Oregon this month I'll have it replaced.

My thoughts on the purge valve are along the same lines of not wanting to have a problem with air supply. So, I'll have mine rebuilt every four years too.

We'll be heading the East coast next year, kind of early in the year, spending a few months before taking in the Indy 500 100th race. Then up to the lakes area for the first time. So, well be in more humid areas for that 5-6 months. I'll probably back up the maintenance to 3 1/2 years on this cycle.

Best to all,
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Old 10-08-2015, 09:47 PM   #6
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I researched the heck out of this when moving from gasser to DP - last thing I wanted was any problems with air brakes when running down a grade! Steve pointed out an important factor that has an influence on how frequently to do the air cartridge replacement - where you travel, and the amount of humidity makes a difference.

We're mostly West side of the country, so I elected to do a every four year cartridge cycle. Ours is due now, and while in Oregon this month I'll have it replaced.

My thoughts on the purge valve are along the same lines of not wanting to have a problem with air supply. So, I'll have mine rebuilt every four years too.

We'll be heading the East coast next year, kind of early in the year, spending a few months before taking in the Indy 500 100th race. Then up to the lakes area for the first time. So, well be in more humid areas for that 5-6 months. I'll probably back up the maintenance to 3 1/2 years on this cycle.

Best to all,
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I bleed the air tanks frequently using the valves in the compartment under driver's seat. I have never felt any moisture when doing that. I had the air dryer serviced at 48,000 miles ten years ago. Had it done at a major dealer in Florida and the tech said there was no evidence of moisture or powder, he also said that as long as my purge valve is working properly and I continued bleeding the tanks with no evidence of moisture then there is no need to replace the desiccant cartridge. I now have 98,000 miles and have owned the mh for almost 16 years so I am having the cartridge replaced even though there is no evidence of moisture. I guess I have been lucky but don't want to push my luck!

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Old 10-10-2015, 11:31 AM   #7
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For what it's worth, I put the rebuilt Bendix unit, part number 109477X, on "will-call" at Pacific Truck Center in Coburg Oregon to make sure they had it in stock when I went to pick it up. Their price was $463.93 less core return of $247.00 resulting in an out-of-pocket cost of $216.93. It was easy to pick up and take with me to the Peterson CAT shop in Eugene Oregon for installation and return with the core for the refund of the deposit. I acknowledge that other scenarios may be cheaper but this was the best cost-versus-hassle ratio at that time and place in my case.

Don't know for sure that the dryer needed to be replaced but could find no record of it having been done in the previous 13 years. No moisture was coming out of the spitters when tanks were purged.
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Old 10-10-2015, 09:01 PM   #8
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For what it's worth, I put the rebuilt Bendix unit, part number 109477X, on "will-call" at Pacific Truck Center in Coburg Oregon to make sure they had it in stock when I went to pick it up. Their price was $463.93 less core return of $247.00 resulting in an out-of-pocket cost of $216.93. It was easy to pick up and take with me to the Peterson CAT shop in Eugene Oregon for installation and return with the core for the refund of the deposit. I acknowledge that other scenarios may be cheaper but this was the best cost-versus-hassle ratio at that time and place in my case.

Don't know for sure that the dryer needed to be replaced but could find no record of it having been done in the previous 13 years. No moisture was coming out of the spitters when tanks were purged.
How many hours labor was charged for replacement of the Air Dryer assembly?

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Old 10-11-2015, 07:40 AM   #9
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How many hours labor was charged for replacement of the Air Dryer assembly?

Ray
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Two hours, Ray.
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Old 01-30-2016, 09:56 PM   #10
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Great, thanks. Just had a remanufactured Air Drier installed at WW Williams in Tucson, they had a special, $318. Installed, also had the transmission fluid, transynd drained, new filters and new transynd for a fraction over $400.
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