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I am looking to pick up some spare bearings for a couple of Porter Cable 690 series routers. I would have thought that there would be some cross reference between PC part numbers and standard bearing numbers somewhere on the web. If it exists, I could not find it. Here are the two PC part numbers:
878065 fan bearing
855284 commutator bearing
I know I can take the unit apart and remove the bearings and measure them, but I'd like to have the replacements on hand before I disassemble the units.
Your assistance would be greatly appreciated.
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(12-19-2024, 01:20 PM)Philip1231 Wrote: I am looking to pick up some spare bearings for a couple of Porter Cable 690 series routers. I would have thought that there would be some cross reference between PC part numbers and standard bearing numbers somewhere on the web. If it exists, I could not find it. Here are the two PC part numbers:
878065 fan bearing
855284 commutator bearing
I know I can take the unit apart and remove the bearings and measure them, but I'd like to have the replacements on hand before I disassemble the units.
Your assistance would be greatly appreciated.
Here's the second one:
855284
And this one is said to be correct for the other end:
878064SV
John
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(12-19-2024, 03:18 PM)jteneyck Wrote: Here's the second one: 855284
And this one is said to be correct for the other end: 878064SV
John
Those 608 roller skate bearings are very common, that seller is getting the PC premium but a good source to back into the numbers.
If I was replacing them I would get an Abec rated bearing like an Abec-5 as they are not much more expensive.
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John/Brian: thanks for that feedback. Assuming we can trust the bearing numbers on the bearings shown in the pictures on the Amazon website (and assuming they are not just stock bearing photos). It looks like both the 608z and 6202rs are the standard bearing numbers and these are widely available, and at various quality levels. I am also assuming that I could substitute a 608zz for the 608z. I did find the exact OEM replacement bearings on ebay, but I suspect these bearings have been sitting on a shelf for many years and I've heard that there is an expiration date on these types of bearings due to the aging of the grease. If I am going to the trouble of changing the bearings, I'd like to get "fresh" bearings. Phil
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(12-19-2024, 06:20 PM)Philip1231 Wrote: John/Brian: thanks for that feedback. Assuming we can trust the bearing numbers on the bearings shown in the pictures on the Amazon website (and assuming they are not just stock bearing photos). It looks like both the 608z and 6202rs are the standard bearing numbers and these are widely available, and at various quality levels. I am also assuming that I could substitute a 608zz for the 608z. I did find the exact OEM replacement bearings on ebay, but I suspect these bearings have been sitting on a shelf for many years and I've heard that there is an expiration date on these types of bearings due to the aging of the grease. If I am going to the trouble of changing the bearings, I'd like to get "fresh" bearings. Phil
The letters on the end are the shielding. Z means dust proof and ZZ means dust proof both sides. Different mfg may use different letters and I'm sure one Z is really the same on both sides of the bearing. The 6202RS I have questions on. There is a very common 6202 bearing used in a lot of 6" jointers but probably too large for a router. So I'll assume it's a 620-2RS? The 2RS means 2 sides rubber seal. That would be a fully sealed bearing.
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(12-19-2024, 06:20 PM)Philip1231 Wrote: John/Brian: thanks for that feedback. Assuming we can trust the bearing numbers on the bearings shown in the pictures on the Amazon website (and assuming they are not just stock bearing photos). It looks like both the 608z and 6202rs are the standard bearing numbers and these are widely available, and at various quality levels. I am also assuming that I could substitute a 608zz for the 608z. I did find the exact OEM replacement bearings on ebay, but I suspect these bearings have been sitting on a shelf for many years and I've heard that there is an expiration date on these types of bearings due to the aging of the grease. If I am going to the trouble of changing the bearings, I'd like to get "fresh" bearings. Phil
How did the numbers go from 878065 and 855284 to 608Z and 6202RS?
John
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(12-20-2024, 02:16 PM)jteneyck Wrote: How did the numbers go from 878065 and 855284 to 608Z and 6202RS?
John
I took a look at the pictures of the bearings on the Amazon pages you provided links to and they are marked as such. Assuming these are not just some stock photos as I mentioned above, this would allow me to purchase from a wide variety of bearing manufacturers and quality levels, rather than trying to source the bearings based on the OEM part number.
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(12-20-2024, 03:07 PM)Philip1231 Wrote: I took a look at the pictures of the bearings on the Amazon pages you provided links to and they are marked as such. Assuming these are not just some stock photos as I mentioned above, this would allow me to purchase from a wide variety of bearing manufacturers and quality levels, rather than trying to source the bearings based on the OEM part number.
Ah, I see now. I'm not sure I'd trust that the photos are of the actual bearings. I'd buy a set based on the original part numbers and see if they match up before looking further. How many 690 routers do you own. I have one. It's been running for over 30 years - and does need some new bearings. I suspect any quality new bearing will meet my needs for however many more years I will be wood working.
John
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(12-20-2024, 03:53 PM)jteneyck Wrote: Ah, I see now. I'm not sure I'd trust that the photos are of the actual bearings. I'd buy a set based on the original part numbers and see if they match up before looking further. How many 690 routers do you own. I have one. It's been running for over 30 years - and does need some new bearings. I suspect any quality new bearing will meet my needs for however many more years I will be wood working.
John
John: I have fallen down (another) rabbit hole with this latest project involving these 690 routers. I am at the point where simply tearing it apart seems like the best course of action. I will update you on my findings. Phil
