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Old 04-18-2019, 07:29 AM   #1
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Good reason to think about older air spring replacement

Have seen a few discussions concerning when to replace air springs on older coaches . Have seen some responses bragging about theirs being 20 years old, or having 95,000 miles on theirs. Some reply's seemed as though the poster was not too concerned . Well, I dediced that I was going to replace mine being my coach is 17 years old . I could see the tiny cracks right at the bottom of all my air springs and thought that was not too good. Knowing a bit on how rubber breaks down on tractor inter tubes, old gear shift boots and even tires , I was concerned . My reason for concern was primarily what would happen if a rear spring blew . With a very short drive shaft and it needing to be in good alignment between the differential and trans , know that if both springs are not inflated to bring the shaft in alignment , major damage could occur , especially at high speeds. If one blew I assume the angle would def change enough to still cause damage . Anyway, My suspicions were correct or at least my idea of changing out my air springs as a preventive measure was a good choice . Here is a pic I took of rear bag , this pic was taken between the rear tire and the bag so I could get the part # of the bag ( which btw, turns out wasnt helpful when ordering from NAPA) I would have never known this with out the pic, because this area is really hard to see while crawling around under the coach . Click image for larger version

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ID:	242519 As you can see , right below the # 4 on the bag id # there is a chunk of outer rubber missing and you can see the inner core of the bag. I am glad I decided to do this now while in my shop , rather than on the side of road, or some shop in Tiny town USA.
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Old 04-18-2019, 07:41 AM   #2
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The failure mode on mine was a hole which sometimes leaked depending on how far the bag was inflated. I thought I had a leaky valve, so I drove 3,000 miles home and decided to troubleshoot then. It turned out it was the airbag, so I replaced it. I looked at the other 7 and decided to replace them, too. On the Monaco 8 airbag chassis, they’re exposed to road debris when the plastic ‘broom, protecting them wears out. I replaced them also, but couldn’t find ones as thick as the original.

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Old 04-18-2019, 08:09 AM   #3
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Photopilot , I ordered all new from Napa, turns out they were wrong . I had read the # stamped on the actual rubber, but that is not correct # at least in this case . I was so excited yesterday when they quoted me around $670.00 for all four . Freightliner price is $1082.00 .
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Old 04-18-2019, 08:18 AM   #4
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Check this out ,nothing I could see would fit my chassis but still pretty cool.
https://liquidspring.com/
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Old 04-18-2019, 08:21 AM   #5
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My coach is 19 years old and I did a close inspection of mine three years ago and ended up replacing one bag which had a torn cover. The rest were good even though they had some checking on the outside. I cut open the air bag I took off and the inner liner looked very good. Mine were ~$150 each, but I have 8.
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Old 04-18-2019, 08:22 AM   #6
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Quote:
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Check this out ,nothing I could see would fit my chassis but still pretty cool.
https://liquidspring.com/
I think those are for gas coaches that don't have an air suspension.
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Old 04-18-2019, 09:18 AM   #7
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barmcd, yep , you is correct ,I just thought I read something about replacing air springs with this and I saw class A . Im bad to not read everything the first trip. Besides they are really , really expensive , one review said something about $13,000.00+
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Old 04-18-2019, 09:42 AM   #8
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well, got the correct one ordered from Freightliner, $1082.00 before tax , Will have fronts tomorrow, rears about Tuesday. Oh well will give me time to do something I have been wanting to do and that is really clean that underneath, then grease everything that has a grease fitting , tighten steering ( just a little) change Gen oil filter and fix one known tiny air leak that I was fortunate to find without checking all over this thing.
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Old 04-19-2019, 07:14 PM   #9
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I replaced all 8 of my air bags after one blew, (thankfully at home). They were 19 years old and had signs of cracking. When they were pulled some showed signs that they would have also failed soon. For me it is a safety issue and at that age I believe that they should be replaced. Probably sooner! We age out tires at 7 years, airbags are also made of rubber. While they are not generally exposed to the sun they still age out. The new air bags are great also.
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Old 04-19-2019, 07:31 PM   #10
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Mine were 18 years old.....I got them from truckspring.com free shipping.
I'm not in a contest to see how far or long I can run something, air springs, just like anything has a life expectancy and should be looked at as a maintenance item.Click image for larger version

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Old 04-20-2019, 10:39 AM   #11
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Mack wrench , you are exactly correct. I t is extremely important , just think what would happen if the rear springs failed ( unlikely both at same time) but the driveshaft is very short on most dp's and it is in line with trans and diff when bags are inflated so at highway speed a blown air bag could cause MAJOR damage, and btw, the rears are generally easy to replace compared to front springs on some coaches.
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Old 04-21-2019, 06:34 AM   #12
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Now you got me thinking. Can anyone direct me to a write-up, post, video, etc on how to replace these air springs? Thanks in advance.
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Old 04-21-2019, 06:49 AM   #13
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I did a small write up when I replaced ours.
Spring Maintenance and Preparing for extended outing
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Old 04-22-2019, 06:13 AM   #14
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I did a small write up when I replaced ours.
Spring Maintenance and Preparing for extended outing
Thanks for the info. I don't have hyd. jacks. If I run my MH up some homemade ramps, put my jack stands in place, and then dump the air, do you think this will work.
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