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Old 05-16-2016, 05:45 PM   #1
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Replace Air Dryer

I have my coach at the Cummins shop to do the 120,000 mile top adjust. I asked them to check out an air leak in the front air system. I hear the leak near the right front tire when I shut down the coach. If I shut down around 7:00 PM, the front tank will be down to 65 by 7:00 AM. The back will still have 110 lbs or so.

The service writer called and said the problem is the Air Dryer? When I said that only the front tank is leaking down he back peddled a bit.

A friend that manages the local electric company (PECO) truck shop told me that when they have to replace the air dryers they change them over to one (I forget the brand) that is $220 including the filter.

I do not pick up the coach until later this week but want to do a bit of research. Does anyone know what air dryer is on the 2008 Mountain Aire?

Thanks
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Old 05-16-2016, 08:52 PM   #2
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Freightliner or Spartan chassis?
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Old 05-16-2016, 09:48 PM   #3
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I should have mentioned that, it is a Spartan K2 chassis.
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Old 05-16-2016, 09:52 PM   #4
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I replace the cartridge on our '02 DSDP Spartan MM chassis. Just spun the old cartridge off (which wasn't easy due to the gorilla they used to install them). I found that there was no moisture in the dryer unit so I just wiped it out and put the new cartridge on.
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Old 05-17-2016, 06:00 AM   #5
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Hi BrokeDown,

Hearing an air leak near the front of the coach tells me to look at:
1. one of the front ride height valves
2. air tank drain
3. connections
4. front air components

Don't know where your air dryer is located but all I've seen are in or near the engine compartment.
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Old 05-17-2016, 06:23 AM   #6
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I installed this filter on my My 2007 MADP K2 chassis. http://www.napaonline.com/p/TWRH950011$37.80 It is out of stock now but check at you local Napa to see if they have. Interesting thing is that is is produced at the same German factory as the Meritor filter. It had the same heavy can and only only lacked the silver paint and the Meritor/ Wabco markings.

A heavy duty strap wrench and a long 1/2 inch flex handle would not budge the Meritor. Had to use a large sacrificial slotted screw driver and a hammer to get it to slowly spin off. Hit it on the rim of the filter. Be sure to grease the filter o-ring on the new one.

The factory installed filter is the Meritor R950011 Air Dryer Filter Cartridge. Used on System Saver 1000 and 1200 Series.

Good Luck!
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Old 05-17-2016, 12:41 PM   #7
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The factory installed filter is the Meritor R950011 Air Dryer Filter Cartridge. Used on System Saver 1000 and 1200 Series.
Thanks. The cummins dealer said I have a Wabco 432 413 001 0. I see the whole unit for sale online for around $140. They say they are new, I wonder if they are Chinese knockoffs?
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Old 05-17-2016, 12:44 PM   #8
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Quote:
Originally Posted by GaryKD View Post
Hi BrokeDown,

Hearing an air leak near the front of the coach tells me to look at:
1. one of the front ride height valves
2. air tank drain
3. connections
4. front air components

Don't know where your air dryer is located but all I've seen are in or near the engine compartment.
Thanks for the info. I spoke to Spartan. They said if the dryer is bad that the front tank would leak down but the air bags should not leak down. He suggested that I have 2 problems. The dryer was one and the items that you list could be the other.
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Old 05-17-2016, 01:28 PM   #9
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Hi BrokeDown,
If you replace the air dryer yourself, every last PSI of air must be drained from the tanks. If there is any air left in the system you'll never get the air dryer off.
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Old 05-17-2016, 05:36 PM   #10
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If there is any air left in the system you'll never get the air dryer off.
Thanks.

The friend that manages the PECO truck shop says that as they go bad, they are replacing all of theirs with Midland Air Dryers. He said they work well. I am not sure if I want to buy the ones from Amazon or eBay that claim to be new Wabco or go with the Midland.
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Old 06-10-2016, 06:08 AM   #11
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Quote:
Originally Posted by BrokeDown View Post
Thanks.

The friend that manages the PECO truck shop says that as they go bad, they are replacing all of theirs with Midland Air Dryers. He said they work well. I am not sure if I want to buy the ones from Amazon or eBay that claim to be new Wabco or go with the Midland.
Hi John,

DO you have an update on this? Curious what you ended up doing. Since we both have the same coach (give or take a couple feet), I'm interested to find if you've resolved this. My leak seems to be in the rear, but I don't hear anything after shutting down and it usually takes a day or two for the rear to fully sag down. The front stays up.

Since there only seems to be one dryer, I'm curious how replacing the it will fix the issue and why wouldn't my front be dropping as well if there was a leak in the dryer?
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Old 06-11-2016, 06:42 PM   #12
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I have not replaced it yet and I may not. I am told that the air dryer leak would not affect the air bags leaking down. Once the air bag is full, a valve closes off and should keep the air from escaping. It may be the valve that is leaking.

I have a friend that manages a big truck mechanic shop. He asked if I was having any problems with the coach when I'm driving it down the road (I'm not). He said they would leave if alone unless it is causing a problem. He said that a lot of trucks leak from the dryer and as long as the truck is not having a problem they do not mess with it. He said many of their trucks sound the low air warning in the morning when they are started for the first time that day.

So I'm not sure I will replace mine.... for now.

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