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Old 03-04-2017, 03:55 PM   #21
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Ok, so for the final word on this. I live in humid south Florida. I am very good about maint and will drain every fill up if necessary. Do I need to install a air dryer from the get go to prevent costly damage to my system? Can I wait until a little while?
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Old 03-04-2017, 05:39 PM   #22
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Seneca Compressor - All Quiet Now

Here's some anecdotal evidence if you're interested.... my company's delivery truck is a 2003 GMC C8500 with a 3126 Cat diesel and 6 speed fuller trans, obviously air brakes. A bit heavier than your senecas, but still a similar medium duty chassis. It does not have an air dryer, but has automatic purge valves on the tanks. We run it hard daily in humid Michigan summers and then it's parked from late December thru April, much like an RV. My drivers NEVER purge the tanks... they don't do it annually, let alone daily, and in 14 years and 270,000 miles we've never had to do anything to the air system besides brake shoes, drums and 1 rear brake chamber. Our previous truck was an 89 Mack that also didn't have a dryer. It made it to 475000 with no air issues either.

I'm not saying an air dryer isn't preferable, but it isn't necessary either.


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Old 03-05-2017, 04:57 AM   #23
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Thanks, this helps me feel better about not getting a dryer right away.
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Old 11-04-2017, 11:59 PM   #24
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Quote:
Originally Posted by jimclawson View Post
To LSA376;

We just bought a 2016 Seneca 37RB, and we have a loud rhythmic noise that almost sounds like metal on metal right after starting the engine. Goes for a few minutes than suddenly stops as if a switch was turned off. Could that be the same sound that you were experiencing?
I was worried about this noise on our new '18 37RB... Gotta love these forums for answering/solving questions like this.
Now to find a solution to quiet it down that won't cost $2500.


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Old 11-05-2017, 06:01 AM   #25
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That noise drove me nuts when I first got my Seneca. Once I found out it was only the compressor, I felt much better.
Same thing with the engine fan. First time it turned on we thought the engine was going to blow up. Now we accept it for what it is.
And yes, this form definitely gives me peace of mind.
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Old 11-07-2017, 03:12 PM   #26
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Originally Posted by LSA376 View Post
I have a '16 37TS with air brakes and seats. The air compressor was so freaking loud it would scare our 110lb Bernese Mountain dog when it would engage while traveling down the highway.

After digging into it I noticed no air dryer. I called Freightliner to get a parts list and the parts manager tells me " it has to have an air dryer." I tell him no it does not. Again, he states " any truck with air brakes MUST have an air dryer." He tells me I don't know what I'm looking for... Really.

He asks for the VIN #, after a few minutes he tells me "it doesn't have an air dryer." No @*%$!

Jayco wanted to save a few bucks I guess.

Long story longer, $1,500.00 later in parts the dryer's installed and low and behold... Compressor nice and quiet. Without the dryer the compressor sound is directly transmitted into the first air tank making it extremely noisy. Oh, and as a side note, I won't stress out about the water content in my brakes... As much.

I also found a leaking air line on the rear air bag. It would sag the rear end overnight, now the bags hold tight for nearly a month before they lose air.
Did you install this your self ? or did you have a service provider handle this for you. I called my freightliner service provider and they looked up my vin and they said the system says i have an air dryer. I told them that I don't and they insisted that I do. Long story short I think I have convinced them that I don't have the dryer and if it is possible to install myself i could stand on saving $800 if it is doable.
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Old 11-18-2017, 05:55 AM   #27
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I had a Meritor Wabco ss1200 air dryer installed yesterday. The unit was priced at $299. You can find them on line for $225. Labor was $825 for 7 hours. Misc parts mad up the rest for a total of $1265.

They mounted the unit on the drive shaft support rail between the rail at the battery compartment.

The conduit for the slide is pretty close and I will need to make sure that it doesn’t bind up when retracting the slide. We tried it a couple of times and it looks okay but will need monitoring.

It is pretty loud when it vents. Not sure if it is any quieter if it is up front or behind you. I did notice on the 18.5 Senecas the unit is in a similar location on the rails.

This has taken a big chunk of stress off as I will be driving a lot in the next few weeks in the freezing weather conditions and always wondering if there was going to a problem. Especially in cold rainy days with freezing temps at night.






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Old 12-07-2017, 09:07 AM   #28
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Pictures and parts

Does anyone have pictures and parts of this fix? I saw the parts in a post above but it was in the post and hard to read. Do you have it in a word document or similar? That noise drives me nuts!

Also wife notices a noisey “fan” type noise when I accelerate near the side door. Doesn’t seem motor related to me? Has also done it when parked at the fuel station.
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Old 12-07-2017, 11:37 AM   #29
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Seneca Compressor - All Quiet Now



Here is my work order and invoice. Doesn’t really tell you much. The unit photo is above. They start by mounting the unit in a convenient location that is with in certain distances and then they plumb in the air from the governor/compressor and into the tank. Hook up an electrical wire to run the heater. And away you go. Could be done by someone reasonably handy but since the unit is under warrantee I felt it was important to have them handle the work.


The loud fan during driving and at rest is most likely the cooling fan, watch your temperatures next time and you can see the temperature going up and the fan coming on and the temperature then will drop fairly rapidly.


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Old 12-07-2017, 02:13 PM   #30
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Originally Posted by RVermont View Post
Here is my work order and invoice. Doesn’t really tell you much.
Looks like you got a great deal compared to some folks who have posted their quotes before.

I can't remember, did your dealer tell you initially that your unit HAD to have a factory-installed air dryer? I know some have heard that!
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