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Old 03-21-2020, 05:58 PM   #1
Mike3387
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For those who've installed Timken Bearings

Doing my Spring checklist and decided to install Timken bearings. I have one wheel off (taking my time because I have lots of it right now) and the first thing I realized is I ordered the wrong size grease seal. The teardown is going exactly like the Youtube videos I've seen. Thought I'd check the fit of the larger bearing. It will not slide completely onto the spindle like the original bearing does. The original bearing has some discoloration on the inner race, but nothing is indicating that it was forced on. The part numbers (25580) match between the two (old and new) bearings. I've done aircraft wheel bearings plenty of times and I know if you mis-align it just a bit, it'll bind. I've tried the other bearings with the same result. It's been over 30 days so I'm not sure if a return is possible, but if this is a Timken thing, maybe I can look for an alternative. Except for the grease seal, I could clean, repack the old bearings, reinstall everything and worry about it later. All that to ask; have any of you experienced the bearing not fitting?
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Old 03-21-2020, 06:11 PM   #2
mlh
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Are the bearing the same size as the old ones that is within .0002 inches and the same length. If so they should fit. You should be able to get a grease seal at any bearing store or have them shipped next day.
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Old 03-21-2020, 06:23 PM   #3
rohrmann
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When I upgraded to the Timkens, I used the same bearing numbers as the Dexter bearings that came on the rig and they fit perfectly. They were genuine Timken made in the USA bearings. Hopefully the bearings you bought are the real thing and they should not be larger in any way than the original bearings with the same numbers on them.
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Old 03-21-2020, 08:23 PM   #4
1retired06
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Same here, perfect fit.
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Old 03-22-2020, 07:16 AM   #5
Dave W
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That 25580 inner bearing fits all Dexter axles from 5200 through 8000 pound and is pretty snug on the fit and wont take much misalignment while installing - and might even take a light tap or two.


If you have or can borrow a set of 2" micrometers, in and out, or better a good vernier caliper with inside and outside capability, measure the spindle and bearing. This is the CAD with the dimensions; https://cad.timken.com/item/all-prod...-2/25580-25520


If just a bit discolored with hammered in grease like I found one time, a strapping with wet/dry sand paper, using light oil as a lube may be the fix


Amazon has a bunch of verniers from low end to way up in price with the dial and digital kinda iffy until you get well up in price. Mine are the old fashioned kind that are tough for old guys like me to read without a magnifier.
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Old 03-22-2020, 03:15 PM   #6
Mike3387
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Possible Solution

I went and purchased a digital caliper after reading how none of you experienced any problems. I started doing some measurements and realized the hub, with bearings/races and grease seals installed should not fit on the slightly raised area on the spindle. I've ordered the correct size grease seal and won't be able to test my theory until I re-install the hub. I also realized that the original bearing inner race is actually slightly too big for this particular application. That would explain the areas of discoloration I found on the inner race of the large bearing. The inner race was rotating on the spindle. Wondering what the other issues i'll face when doing the other three wheels.
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Old 03-22-2020, 10:30 PM   #7
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It took me all day to do all 4 wheels. I had the correct parts because I took the old bearings to the parts house with me. They measured and came up with the correct part and seals.
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Old 03-23-2020, 07:42 AM   #8
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A pair of digital calibers are not accurate enough to measure a bearing diameter. Calibers are only good enough for a few thousands. You need to be measuring in the tenths of a thousand. Bearings are made to a tolerance of a very few tens of a thousand.
In my machine shop we use top brand calibers $200 and over to measure to about .003 inch. This is pretty much industry standard. Calibers will not measure what you need to measure.
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Old 03-23-2020, 07:59 AM   #9
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Quote:
Originally Posted by mlh View Post
A pair of digital calibers are not accurate enough to measure a bearing diameter. Calibers are only good enough for a few thousands. You need to be measuring in the tenths of a thousand. Bearings are made to a tolerance of a very few tens of a thousand.
In my machine shop we use top brand calibers $200 and over to measure to about .003 inch. This is pretty much industry standard. Calibers will not measure what you need to measure.
Lynwood

Digital or dial are probably good enough to measure a mass produced Dexter spindle but their repeatability sucks for low end tools. My old fashioned $$ verier scaled will repeat within <.001 with a set of 1-2" mics being even better.
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Old 03-23-2020, 10:07 AM   #10
mlh
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Originally Posted by Dave W View Post
Digital or dial are probably good enough to measure a mass produced Dexter spindle but their repeatability sucks for low end tools. My old fashioned $$ verier scaled will repeat within <.001 with a set of 1-2" mics being even better.

Brown and Sharp says to only trust calibers to .005.
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Old 03-29-2020, 02:30 PM   #11
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Mike I hope you’re replacing the racer when replacing the bearings I just finish replacing the bearing with racers timken on my Monty not a problem try the bearing by its self on the axle see if it goes in put some grease on the axle and try it . It’s a very tight fit
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Old 03-29-2020, 06:04 PM   #12
Mike3387
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Bearing Race

Yup, i bought the outer races when I ordered the bearings. I ordered the wrong grease seals, but the right ones will be here tomorrow. Got my fingers crossed that what I thought was a bad bearing was just me assuming the bearing should slide all the way on the spindle. I'll know for sure once the hub is re-assembled and I re-install it. I'll post my results.
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Old 03-30-2020, 05:38 AM   #13
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Keep one box for each part. That way if you have a problem down the road you can get the correct part easy.
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Old 03-30-2020, 06:22 PM   #14
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Originally Posted by Slow Hand View Post
Keep one box for each part. That way if you have a problem down the road you can get the correct part easy.
I just take a pix of it with my phone
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Old 03-30-2020, 08:53 PM   #15
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I just take a pix of it with my phone
If your phone is like my phone. Good luck finding that picture again. When i took the old bearings out I just put the best set in the boxes. I bought a extra oil seal just in case.
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Old 03-30-2020, 09:35 PM   #16
pitman44
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Wow, this is great timing. I just ordered bearing seals, but was thinking of changing to Timkens. What's a good place to order them from? Can I order them using the Dexter number?
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Old 03-30-2020, 09:40 PM   #17
rohrmann
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The numbers on the bearings are industry standard numbers, not linked to any one manufacturer. The number applies to any maker and all the dimensions and weight specs should be the same, but quality can be questionable depending on who makes them.
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