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Old 03-24-2020, 12:59 PM   #1
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Doesn't Look good

Was under the coach and found this. If it was on an airplane, I would call it a rupture disc. On an airplane that is a bad thing.
Any idea what is this is and what I should do?
It is located near the aft tires on the driver's side
Thanks
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Old 03-24-2020, 01:11 PM   #2
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From the location and kind of the picture , I'm thinking this is your air system dryer .
Have you ever had the air dryer serviced ?
Does the rest of the unit look like the pictures in this file for dryer servicing ?
Is your coach on a Freightliner or Spartan chassis?
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File Type: pdf Air Dryer Maintenance web version.pdf (161.5 KB, 4 views)
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Old 03-24-2020, 01:28 PM   #3
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It is a Freightliner chassis. Had the air dry serviced at Gaffney 6 to 8 months ago. Do not believe the picture is the dryer. But, I've been wrong before.
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Old 03-24-2020, 01:51 PM   #4
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Any symptoms that led you under there ?

Like no air or 150 psi on the gauge ?
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Old 03-24-2020, 03:32 PM   #5
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No known issues. I was under there with my grease gun doing the 30K mile lube.
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Old 03-24-2020, 04:18 PM   #6
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Call Freightliners free help line with your chassis serial number , and have them send you an air system diagram.
The diagram will give a general location for all components and their names , using the names and Google search you can pull up photos until you get a visual match to your part in question .

1-800-385-4357
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Old 03-24-2020, 06:34 PM   #7
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I emailed FL with the picture attached. Hopefully they will reply.
I considered calling but thought a picture would help.
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Old 03-24-2020, 06:38 PM   #8
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I went through my air system diagram and the part in question may be part of the air brake anti-lock system . If the ground drys up at all here I'll go under my coach with a camera to see if I have a similar part.
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Old 03-25-2020, 02:25 PM   #9
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FCC replied. They have not seen one break like that.
It is part of a check valve kit on the air dryer that costs less than $30.00 Will pick up the kit tomorrow. Held in with a circle clip.
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Old 03-25-2020, 04:48 PM   #10
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puppy needs a power wash
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Old 03-26-2020, 03:08 PM   #11
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I agree with you Dav L.
When I grease the U-joints until it comes out all four caps, it slings everywhere.
I've read somewhere that you can wrap the U-joint in Saran Wrap and drive a few miles. Remove the wrap and MOST of the excess grease SHOULD be in the wrap.
I may consider it in the future.
Thanks for the observation.
Received the new part today.
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Old 03-28-2020, 03:33 PM   #12
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Quote:
Originally Posted by Webz View Post
I agree with you Dav L.
When I grease the U-joints until it comes out all four caps, it slings everywhere.
I've read somewhere that you can wrap the U-joint in Saran Wrap and drive a few miles. Remove the wrap and MOST of the excess grease SHOULD be in the wrap.
I may consider it in the future.
Thanks for the observation.
Received the new part today.
Thanks for sharing the Saran Wrap idea!
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Old 03-30-2020, 11:02 AM   #13
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wrong part

Well I crawled under the coach with the new part. Removed the broken disc.
Then I realized the new part was too small. Emailed FCC with a drawing that came with the new part. Asked what was the other item on the bottom of the dryer. Was told: "This is has to be it there nothing more on the bottom of the Air Dryer. :TURBO CUT-OFF VALVE TDA S432 470 921 2"
Called a FL dealer and asked to see a picture of the new part number.
Low and behold, the new part kit has a reddish orange disc in it that is larger in diameter. Just what I need. The best things are the new part is $20 less and I have a spare kit for the air dryer. Will get the new part in a few days.
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