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Old 04-19-2013, 08:25 AM   #71
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Yes, and if I remember, the nut that holds the bearing/hub onto the spindle is 2 5/16", there is an internal "C" clip holding the bearing in the hub, and the nut is torqued to a high number, which escapes me at the moment....something like 250 lb ft.

So at a minimum, you need the 2 5/16" socket (probably 3/4" drive), and a big breaker bar, or an impact wrench, just to take the hub off the spindle.
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Old 04-19-2013, 09:20 AM   #72
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I can't find the manual online for the discs, but the drum Nev-R-lubes have a 1 7/16" nut, torqued to 145 - 155lb/ft.

Nev-R-Lube_Bearings_3-13.pdf

As for pressing, I haven't had to replace one, but old fashioned bearing races are recommended to be pressed in as well. Although I have driven ALL of mine over the years, with a drift punch and hammer. I wonder if that can be done with these sets as well.

Why are we discussing this potential issue this much? I understand that there have been some reports on other forums with SOBs, but where are the reported AS failures? Have I missed something?
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Old 04-19-2013, 09:34 AM   #73
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Thanks for that info, Rich. I stand corrected. Do you know if the size of the nut is the same for all sizes of the bearings?

We measured on once in Utah when my friend was having brake problems and we were contemplating taking the hub off to inspect, and it seems that I remember the nut size being the same as the hitch ball size, but of course, I have slept many times since then and my memory could certainly be wrong.
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Old 04-19-2013, 09:36 AM   #74
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Wouldn't almost any bearing failure be preceded by some level of abnormal heating of the bearing and surrounding hub, many hundreds of miles before failure?

If so, in most cases we could monitor the heating, say at fuel stops, detect this impending failure before it happens?

I use "touch with an open palm" method on each tire and wheel center now, but I heard of others who use more scientific devices. Are we wasting our time or is this a good practice?

doug k
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Old 04-19-2013, 09:41 AM   #75
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Originally Posted by dkottum View Post
Wouldn't almost any bearing failure be preceded by some level of abnormal heating of the bearing and surrounding hub, many hundreds of miles before failure?

If so, in most cases we could monitor the heating, say at fuel stops, detect this impending failure before it happens?

I use "touch with an open palm" method on each tire and wheel center now, but I heard of others who use more scientific devices. Are we wasting our time or is this a good practice?

doug k
Doug,

I think short of jacking the trailer up, and checking for excessive play and noise, checking temps is about all you can do.

There are inexpensive thermometers available that you just point at an object and push a button. I think they use ultraviolet technology. I have one that I use for other purposes, and have used it on trailer tires, and it works good.
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Old 04-19-2013, 09:42 AM   #76
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No, Steve, I don't know. Dexter seems to support the larger capacity axles and bits online better than the <8,000lb axles. And I have found nuttin' on the specs for the smaller capacity disc hubs, other than sales info. I've never had my caps off to even look at mine.
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Old 04-19-2013, 09:54 AM   #77
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Just found this page. Paper copy and snail mail, but FREE!

Dexter Axle - Trailer Axles and Running Gear Components - Literature Request
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Old 04-19-2013, 10:00 AM   #78
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Doug,

I think short of jacking the trailer up, and checking for excessive play and noise, checking temps is about all you can do.

There are inexpensive thermometers available that you just point at an object and push a button. I think they use ultraviolet technology. I have one that I use for other purposes, and have used it on trailer tires, and it works good.

Funny you mentioned checking the temps with a device. This morning Amazon had one on sale for 50% off but when I went to put it in my cart they were out. I went on a waiting list and was something like #286 in line. A little sign appeared and said "chances of getting this item at the sale price are remote".
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Old 04-19-2013, 10:17 AM   #79
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Thumbs down Temp is the eminy...

Quote:
Originally Posted by dkottum View Post
Wouldn't almost any bearing failure be preceded by some level of abnormal heating of the bearing and surrounding hub, many hundreds of miles before failure?

If so, in most cases we could monitor the heating, say at fuel stops, detect this impending failure before it happens?

I use "touch with an open palm" method on each tire and wheel center now, but I heard of others who use more scientific devices. Are we wasting our time or is this a good practice?

doug k
Quote:
Originally Posted by SteveH View Post
Doug,

I think short of jacking the trailer up, and checking for excessive play and noise, checking temps is about all you can do.

There are inexpensive thermometers available that you just point at an object and push a button. I think they use ultraviolet technology. I have one that I use for other purposes, and have used it on trailer tires, and it works good.
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Funny you mentioned checking the temps with a device. This morning Amazon had one on sale for 50% off but when I went to put it in my cart they were out. I went on a waiting list and was something like #286 in line. A little sign appeared and said "chances of getting this item at the sale price are remote".
Checking temps with an IR gun while on the road and wheel play when tires off the ground is still the best way to keep track of condition.

As far as replacing...I imagine the much larger surface area of the bearing itself contributes to the difficulty of pressing or "punching" it out/in.

Bob
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Old 04-19-2013, 10:28 AM   #80
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OK, I needed to check my bearings anyway, so I went out and did it. Happy to report all is well. And, the nut size is 1 7/16" just as Rich reported.

For an infrared temperature gauge, this is the one I use, it works OK, is relatively inexpensive, and small enough to carry in your pocket. TowerHobbies.com | Duratrax FlashPoint Infrared Temperature Gauge
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Old 04-19-2013, 10:43 AM   #81
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Bob,

What's that one off of? I see 8 lugs on that hub.

I got this one a couple years ago. Small and accurate. It lives in my center console, so it's always handy at gas stops.

Amazon.com: ThermoHAWK 420 Touchless Infrared Thermometer: Health & Personal Care
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Old 04-19-2013, 11:26 AM   #82
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Rich,

If the grey cells are working it was a 30' fifth wheel.

There's a good deal on Amazon, Fluke 62 IR.


Bob
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Old 04-19-2013, 11:27 AM   #83
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Thanks guys for posting the IR thermometers you use. They are pretty small and the price is not bad at all.
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Old 04-19-2013, 11:31 AM   #84
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I have the nev-r-lube bearings on my trailer and haven't had any real trouble with them. There was some excess grease that escaped and ran radially out on the wheel when they were brand new but that may well have been assembly grease and not anything from the bearings themselves. The dealer who looked at it under warranty said there wasn't a problem.

In Minnesota, with cars and trucks having unitized bearing assemblies, it is my experience that they typically have to be replaced once during the life of the car. Sometimes hub and rotor corrosion leading to an unusual amount of force being required to remove the rotor from the hub contributes to this. For cars there are some cheap aftermarket replacement bearing/hub assemblies that don't hold up for long but the OEM ones seem to go for around 100,000 miles or so if properly installed and not sent to an early grave by the application of the 16 pound sledge, air hammer, or torch.

It is also my experience that, with cars and trucks, the unitized bearing assemblies give plenty of advance warning when they fail -- noise, play, and heat. More warning than traditional roller bearings, in my experience.
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