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Old 02-29-2008, 06:07 PM   #99
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Well, there's another option as well (from reading) that seems a winner as well. One can order the #10 axle and upgrade JUST THE SPINDLE to #12 (to get the bigger brakes) and get what one wants........ (from Dexter ..... ) No cutting of the mounting plate required.
Marc
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Old 02-29-2008, 08:47 PM   #100
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Yep!

Quote:
Originally Posted by adonh
How do they "de-rate" an axle?

Don
Chuck is correct - the length of the rubber cord (or rod) determines the axles capacity! The 4000 - 6000# axle family differs only by rod length!

The shorter the rod the less capacity!

Additionally, Marc is correct also - by placing a longer rod in a #10 axle, the capacity can be increased!

The 4000# axle would however be a larger and stronger tube body - in simple terms more "heavy duty'' all around!

Good thread all!
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Old 02-29-2008, 09:26 PM   #101
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Having read every post in this thread y'all have provided confirmation that i did the right thing by letting my local RV repair shop handle my single axel swap for me. in that it's a relativly quick project, labor should come in at 2 hours tops or $160.

however, the info gleaned here is invaluable when the time comes that i have to swap out my 3 axles on the 34. with that job the labor costs will add up.

not to stir the pot too much - my repair guy swears i won't need the shocks.

thanks for sharing!
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Old 03-08-2008, 01:45 AM   #102
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My Overlander needed axles back in 2006 and I put the whole job on a local Dexter dealer. He had previous experience installing Dexters on Airstreams. And to him it was all pretty routine. He spec'd the #11 Axles derated to 3600# with 22.5 degree down angle, 12'' brakes and Nevrlube sealed bearings. I went along with the dealers recommendations because I knew if there was a problem, it would be on him. He did explain that I would need 4 new Dexter wheels to accomodate the Nevrlube bearings, this was OK with me because I needed new tires (Marathons I bought from Tire Rack) When my dealer called Dexter placing the order he spoke with a Dexter engineer in Indy, who he knew on a personal basis. Three weeks later my axles were delivered. What surprised me the shock mounts were factory installed, but my dealer said I would NOT need shocks I would think the shocks would only contribute to a more smooth ride, although I've been running without shocks and have no complaints at all and don't have the chore of repacking wheel bearings. And the total bill for axles, new brake assemblys, wheels, Nevrlube bearings and labor was $1300. Job well done.
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Old 03-08-2008, 01:59 AM   #103
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Nevr-Lube Bearings
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Old 03-08-2008, 09:25 AM   #104
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Quote:
Originally Posted by TOM CRUMP
My Overlander needed axles back in 2006 and I put the whole job on a local Dexter dealer. He had previous experience installing Dexters on Airstreams. And to him it was all pretty routine. He spec'd the #11 Axles derated to 3600# with 22.5 degree down angle, 12'' brakes and Nevrlube sealed bearings. I went along with the dealers recommendations because I knew if there was a problem, it would be on him. He did explain that I would need 4 new Dexter wheels to accomodate the Nevrlube bearings, this was OK with me because I needed new tires (Marathons I bought from Tire Rack) When my dealer called Dexter placing the order he spoke with a Dexter engineer in Indy, who he knew on a personal basis. Three weeks later my axles were delivered. What surprised me the shock mounts were factory installed, but my dealer said I would NOT need shocks I would think the shocks would only contribute to a more smooth ride, although I've been running without shocks and have no complaints at all and don't have the chore of repacking wheel bearings. And the total bill for axles, new brake assemblys, wheels, Nevrlube bearings and labor was $1300. Job well done.
It's interesting to read the opinions of some owners and non Airstream dealers, that shocks are not needed.

That would be against the design criteria of Airstream engineers, in spite of using torsion axles.

Most of those dealers don't have a clue as to the principal of construction of an Airstream trailer. If they did, they would tell you that shocks are necessary.

Shocks DO help the trailer have a softer ride, which an Airstream trailer loves.

When it comes to the purpose of shock absorbers, the name says it all.

Cars, trucks or trailers with torsion axles, all need working shocks.

Andy
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Old 03-17-2008, 02:23 PM   #105
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to shock or not to...

Andy, our '74 did not appear to have been originally equipped with shocks. When I put new axles on, should I try to retrofit some shock mounts and install them? Thanks once again.
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Old 03-17-2008, 02:40 PM   #106
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Quote:
Originally Posted by TOM CRUMP
What surprised me the shock mounts were factory installed, but my dealer said I would NOT need shocks I would think the shocks would only contribute to a more smooth ride, although I've been running without shocks and have no complaints at all and don't have the chore of repacking wheel bearings.
It is interesting because my dealer has made a similar statement. Supposedly he says is that the shocks are there because as a premium priced product, the consumer expects to see shocks there. He noted that based on their placement and angle, they provide minimum motion dampening. In a normal vehicle a shock reduces the vertical bounce of a wheel where the axle is cushioned by by coil or leaf springs. In a dura-torque axle the rubber rods within the axle are purported to provide the necessary resistance to offset the bounce.

I may be wrong but didn't Airstream produce a trailer in the last 10 years that didn't have shocks? For some reason I thought it may have been the early CCD's. There are obviously differing opinions out there.

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Old 03-17-2008, 06:35 PM   #107
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That would be the 22ft CCD. I'm not sure if the current 23s have them or not.
Marc
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Old 03-17-2008, 06:41 PM   #108
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Quote:
Originally Posted by jcanavera
It is interesting because my dealer has made a similar statement. Supposedly he says is that the shocks are there because as a premium priced product, the consumer expects to see shocks there. He noted that based on their placement and angle, they provide minimum motion dampening. In a normal vehicle a shock reduces the vertical bounce of a wheel where the axle is cushioned by by coil or leaf springs. In a dura-torque axle the rubber rods within the axle are purported to provide the necessary resistance to offset the bounce.

I may be wrong but didn't Airstream produce a trailer in the last 10 years that didn't have shocks? For some reason I thought it may have been the early CCD's. There are obviously differing opinions out there.

Jack
I find it funny that Airstream would put shocks on a trailer when they are not needed but for many years sold trailers without a spare. I don't believe Airstream is known for adding extras to a trailer because the consumer expects to see them there. I can name a few things I would expect to see on a quality product which are not there. I have to agree with Andy.
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Old 03-18-2008, 05:34 PM   #109
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Never lube

We use a company that has 18 warehouses in the USA.

Amoung many other things, they handle Dexter axles as a distributor.

We asked them about Dexter Never lube hub and drum assembly availability.

Since a regular hub and drum will not fit a Never lube spindle, what does a person do when traveling, if they needed a Never lube hub and drum.

Their answer was that they would have to order it, as none of their 18 warehouses, stock the 12 inch Never lube hub and drum.

Our suggestion then is for those that may choose the Dexter axles with the Never lube bearings, to buy a spare Never lube hub and drum assembly.

In that way should you have a failure, you will have a replacement with you.

Andy
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Old 03-20-2008, 10:45 AM   #110
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no real progress

Well,
No physical progress so far. I'm looking forward to getting some new axles under Epiphany and running the final round of tests. I may pull the existing shocks off and see if I can measure any ride difference with the existing axles ...nah, it's spring and I'm goin' camping...
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Old 03-20-2008, 11:38 AM   #111
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HiHoAgRV

Sometime back, you said you would also report how much time you have spent on the replacement Dexter axles.

Please include the time you have spent with your credit card company to get the original charges reversed.

I would assume that you will have to start all over again, with Dexter.

If we can help you with axles, please let us know.

We guarantee the right axle, the first time, and all we need is just the trailer serial number.

No hassles, no drawings needed, no specs to provide, guaranteed fit, no need to reverse credit card charges, and no need to fight over meeting the axle specs for the trailer, and no problem increasing the start angle or weight capacity.

Sorry that your having so many problems with your replacement axles.

We can only offer you encouragement to hang in there.

Andy
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Old 03-26-2008, 08:02 AM   #112
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Back in post #60 I displayed a graph that showed a 3 hz bounce in the recorded data. That has been buggin me and this morning on the way to work I saw an example of what was going on. I got behind an enclosed trailer with rubber suspension and noticed the hub never moved up and down relative to the body as the trailer hit rough sections. The tires were taking all of the beating and seemed to be bouncing up and down about 3 times per second !

I now suspect my suspension is so stiff that it is unable to absorb any shock, similar to a flatbed trailer with no load.
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