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Old 12-03-2020, 12:24 PM   #1
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2004 Monaco Diplomat Filter "Questions"

Trying to get the lady ready to travel south and one of the things we are working on is the filters and air dryer. As this is our first time working on the mechanicals of the motor home we aren't sure what the 2 red filters are as well as what the black air dryer does and if it needs to be replaced (and where can we find it as no identifying marks). You can see that the red filters were replaced in 2017 but not sure how long they are supposed to last. Thank you in advance for your patience on some of these questions we are shooting out there.
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Old 12-03-2020, 02:24 PM   #2
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The two red ones are Baldwin fuel filters which should be replaced once a year. I let mine go two years this time with no problems For the air dryer unless you are putting on big miles changing it every 4-5 Years is just fine
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Old 12-03-2020, 03:31 PM   #3
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Quote:
Originally Posted by bdpreece View Post
For the air dryer unless you are putting on big miles changing it every 4-5 Years is just fine
That would be the outer limit!

You should be regularly cracking the drains on your 3 air tanks. If you ever see any moisture spray out (usually the wet tank), the dryer filter needs changed.
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Old 12-03-2020, 03:38 PM   #4
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On the air dryer it just spins off. Be sure to let all the air out of the system first. You can pup the brakes until your gauge shows zero then open the drain on the wet tank to make sure. Any heavy duty truck repair shop will have one or atleast can get you one. It is a very common style.
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Old 12-03-2020, 03:57 PM   #5
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The dryer filter change interval will greatly on useage and climate, if you live in a high humidity area it should be changed more frequently. I live in E TN, not to humid, I normally change mine about every 3 years but this time I stretched it due to limited use of motor home.



My filter number is
R950011 Meritor Air Dryer Filter

Any large truck shop should have them but last time I got one off Ebay.
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Old 12-04-2020, 08:53 AM   #6
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Is this coach new to you?

You need to check other filters too. Hydro, air filter, ??

I always keep extra fuel filters too.
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Old 12-04-2020, 05:22 PM   #7
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Should be a meritor R950011. About 45.00
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Old 12-04-2020, 05:28 PM   #8
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Quote:
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Should be a meritor R950011. About 45.00
Nice!

I recently bought one off Amazon up here in Canada. $127 CAD !!
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Old 12-04-2020, 09:17 PM   #9
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Oops wrong thread
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Old 12-05-2020, 08:33 AM   #10
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I bought an aftermarket off Ebay in Jan 2020 for $27. I did check local and all the big truck shops only sold/installed aftermarket for a lot more money.

When I get ready to do maintenance I search and buy filters ahead of time, can save a bunch of money.

I also carry extra fuel filters.
When I change an air filter I'll keep the old one just in case, if nothing else to check numbers & dimensions when ordering a replacement. When I changed my air filter ~6 weeks ago I was surprised to find that I had a large bird nest inside the filter, there is no screen over the intake. At some point I will try and figure a what to install one. The inlet has a louvered shroud on it that is riveted to the side of the coach so not easy to remove. At this point no real way to put one in from behind.
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Old 12-05-2020, 11:36 AM   #11
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I won't take chances with a aftermarket dryer filter anymore since the last one wasn't doing much, if any, drying right from the get go!
Although, I have previously installed a Donaldson filter that performed just fine.
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Old 12-06-2020, 10:43 PM   #12
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Same here. I just don't bother anymore with 'saving' on aftermarket filters. I can buy OE Cummins Fleetguard for real cheap from my 'local' independent dealer. My giant air filter, which is just about as big as a house, was $120 CAD from them. And...there is a difference....

My airbrakes uses Haldex filter/dryer. I've only replace it once, it's due again. But...there is very little moisture in the tanks and we haven't been that diligent with them. And the unit is in a HIGH moisture environment.

When I serviced it I am pretty sure there were two filters. One 'normal' one ad one was a coalescing filter, if I'm not mistaken. We did both and it was well worth it. For us, years of moisture free tanks. It's due now and I'll do it the same way again. Replace both of the things, whatever they were.
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