DIY: Ball bearing replacement in Bosch 4100 table saw

[@russabbott80]

I just found one of these saws by the dumpster. It's in great condition apart from slow RPM. I thought I'd have to take the whole table apart, but your video shows me how easy it actually is to get to the motor. Saving me hours of work, thanks! 🙏🏻

[@Lando1020]

A million thanks to you sir. My motor completely seized on my bosch 4100. Sure enough was same seized bearing as yours. Ordered from amazon (pack of 10). My bearing would not budge. Could not pull off. Had to cut it off very careful with rotary tool being careful not to damage shaft. Set new one with brass mallet and reassembled. SUCCESS!!! Sounds brand new just like yours! You gave me confidence to make this repair. Thank you so much

[@vladton5777]

Thank you for your feedback. This would be especially valued for those who are unsure if they can do this repair by themselves.

[@anthonyhitchings1051]

Thanks, Vlad

[@rjohnson5120]

Thank you for taking the time to document this procedure. I have a loud clunky vibration on start up of my 4100. You made it easy to follow and provide good tips and warnings. Well done!

[@vladton5777]

Thank you for your feedback. I am glad the video was helpful to you.

[@jeffcovington2372]

Great video. My Bosch 4000 table saw had the same problem. The rear bearing was seized. This video saved me from a lot of head scratching and unnecessary disassembly.

[@vladton5777]

Glad it helped

[@scottyoung6252]

Awesome 👍 🎉🎉🎉🎉🎉😊

[@cedergrenpeter]

Thank you very much for this video!!!! My Bosch has been sitting in my garage for two years waiting for me to figure out how to replace the bearing. After watching your video I have the confidence to give it a try. I will comment again once I am successful replacing the bearing.

[@OLIVERWASMYNAMEFIRST]

Thanks for including the bearing dimensions and part number. very helpful.

[@rogerpugoy3042]

Thanks for the video, Vlad. Great help. Had difficulty removing Philips screws. The screw heads got stripped due to screws seized in place. Had to follow advice from the internet and was able to finally loosen the screws: used larger screw bit, applied super glue, sprayed with WD40 and used impact wrench. Had to to replace the larger bearing twice as I missed to insert the collar before pressing the bearing in place😂. Both bearings of rotor were already noisy so I replaced both of them.

[@j.dacosta331]

I have asked many times how to remove the armature from a Bosch 4100 table saw You are the first one many thanks my dear friend jv

[@vladton5777]

You are welcome and good luck with your DIY!

[@martinets2]

Thank you, Thank you, Thank you!!! The exact same bearing went out on my table saw too. It took me no time to put in a new one thanks to your video.

[@christopherriehl5525]

Video saved my day. I was able to dis-assemble and got the entire motor out. Mine looks to be in much worse shape than yours, but had the same damaged rear bearing. Thank you!

[@gte829d]

I have a Bosch 4000. Similar issue with that last bearing in the assembly. Replaced it and carbon brushes thanks to this video. It sounds like a new table saw now. Thanks!!

[@edtimmermans3472]

You rock Vlad!! Your video showed me exactly what I needed to do to repair my machine and your inspiring words gave me pure confidence to tackle this minor (which I thought was major) problem. Again; thanks so much!!

[@vladton5777]

Thank you very much for such an inspiring feedback.

[@Craig-Mitchell]

Thanks very much 👍🏻 I have the same rumbling bearing noise on my GTS 10 XC and I now feel more confident about investigating and doing the finding out which bearing and replacing it.

[@jeffb3997]

Thank you for this. I had the same issue. You seem like a great neighbor too. Happy holidays my friend.

[@CraigNapier-hd4ic]

Thanks for this video. I had looked 2 years ago and could find nothing at all. Have battled to release the motor and now have found the same bearing is shot. Looks like many people have this problem with Bosch so your advice will be well used. Happy woodworking.

[@tomgrantham9992]

Great job explaining how to install the bearing. Thank you for sharing your experience. 👍👍👍👍🙂

[@jason-hh6lu]

Well done. Good job 👍🏻

[@michaelhancock9636]

Glad I found this video. My saw stopped working about a year ago. It's been in my garage collecting dust. I bought a Hitachi and it is terrible, literally falling apart from the first week I had it. Today I took apart the old Bosch 4000 and found that rear bearing totally seazed. I'm not certain the armature is not shot but I'm going to replace the bearing and see if it works.

[@indavietual]

Did it work? I also have the 4000 and my bearing is totally seized. Waiting on a puller to replace the bearing.

[@edward11762]

"This is where my problem is.. probably" 😂 you just gained a subscriber, brother.

[@albertosandoval7286]

So very helpful. Thank you for making this video.

[@Grumpyneanderthal]

Thanks for this video, it's very helpful. A while back I changed one of the other bearings but not the one on the end opposite the blade, which squeals occasionally. This is an easy way to access it. I have the bearing and just need to get it installed. Then I'm selling this saw because the raise and lower mechanism sticks and requires frequent cleaning and dry lube. Good saw otherwise but very frustrating to struggle to raise and lower blade.

[@vladton5777]

I am glad the video was helpful to you. Yes, I also have issues with raising/lowering the blade. I found that when I keep gears dry completely, i.e. without any lube, they work better. The wheels are made of plastic which is "slippery" enough.

[@jmi7562]

Thanks for the clear video and the steer to Princess Auto.

[@richarddrempel8912]

Thank you for the clear video. I have this table saw and need to replace that same bearing.😊🇨🇦

[@larryhemstreet7696]

Nice work on video - - I will be doing this job as soon as I acquire the parts. My saw is the 1st gen version (4000) but I'm sure it will be almost identical. It is a good design with one weak part - - a situation that is very common in all machinery.

[@vladton5777]

I am glad the video was helpful to you. Good luck with your repair project and other woodworking projects.

[@barbyoder267]

I found it's much easier to turn the saw upside down, remove the saw blade and tilt to 45 degree. This makes everything very accessible. First remove the brushes, then remove the 4 screws of the motor housing, pull off motor cover which leaves armature and front bearing attached to the saw and do the repairs. 1hour max repair. I don't recall you mentioning changing the rubber gasket that goes over the bearing. After looking at the parts manual I noticed there is a rubber gasket that goes over the bearing. Mine was shredded when I took the motor apart to change the bearing. I don't know for sure but I speculate because the motor housing is plastic and a worn bearing would destroy a plastic housing, I wonder if the purpose of the rubber gasket is to melt under heat and stall the motor so more damage isn't created. It's less than a $3.00 part.

[@KimChul54]

Thank you. Thanks to you, I wanted to fix it, so I solved it. As expected, it was a problem with the same bearing, so I replaced it. Have many good days.^^

[@LoudBarkDesigns]

FYI the red seal faces the fan on the armature. Its a dust seal

[@freeheeler09]

Vlad, nice job!

[@vladton5777]

Thank you for your feedback, indeed. I am glad the video was helpful to you.

[@Absolute_Unit135]

Thanks for the video, very descriptive and well done. Спасибо

[@vladton5777]

I am glad the video was helpful to you. Удачи!

[@jumpbluesdude]

Great video! I guess I’m the only one who is having trouble getting the 4 black screws out. I have tried several different screwdrivers and they all want to slip and strip the screw head rather than grab the screw head and loosen. I think I’m going to have to cut slots in the screw heads with a dremel and use a flathead.

[@originaldanman]

Try a hammer driven impact screw driver. It usually works for me.

[@stevenpcope]

Thanks that was very helpful.

[@rogerpugoy3042]

Hi, so carbon brushes no wiring or connections to terminals, i.e., just need to pull out and push back when re-assembling? Thanks for any feedback.

[@gsilcoful]

Thank you for posting this video.

[@vladton5777]

Your are welcome. Good luck with your projects!

[@Pepe-dq2ib]

I have to replace my bearings soon too, what type of grease did you use for the gear housing? I have some lucas red and tacky and moly grease at home, is any of them fine?

[@RyanWattersRyanWatters]

Thanks so much for sharing. I’ve found that I have a similar problem where the ball bearing (Bosch part 2610911928) is dented and won’t turn. The problem for me is at 5:42. I can’t seem to pull out the motor by wiggling it, even after I removed those two screws. For the ball bearing, what is the size I should order? Getting the exact part number on Amazon is about $15. And what is the name of the tool you used to remove the ball bearing?

[@asakayosapro]

That tool isn’t for the purpose, but rather it’s a tool for detaching automotive ball joints. A bearing puller with either two or three prongs will work well, as well as a hydraulic press with the proper bearing support. Press shaft out of bearing, being careful not to drop or damage the armature shaft and windings.

[@An_Urban_monk]

Thank you for this video! I have 4100 from 2002 and have made so many projects with it I can’t bear to part with it even though I have a sawstop now. Mine seemed to be slipping not siezed. It happened after milling 7-1/2 cm rough walnut to make newel posts. I am a woodworker not a mechanic but you gave me the confidence to try to fix it. Should I replace all the bearings since it is slipping or is that a sign the gears are shot? Thank you.

[@colinblankenship2401]

Thank you for sharing.

[@anthonyderose6069]

And yes, another Thank you!!!

[@jump4j]

I bought cheep bearings from Amazon once for an expensive stove exhaust fan motor and they didn't last a month then I bought SKF bearings and they are still going strong.

[@Pepe-dq2ib]

skf, nachi, koyo, nsk and fafnir are all good bearings. i just shop for whoever has the best price and they have to be made in italy, france, germany, usa or japan, i stay away from ones made in china, india, brazil, indonesia and argentina.

[@piedracolombiana]

Is the same sided bearing

[@jrcone9801]

Anybody have issues getting armature to separate from cover?

[@jeddrickpablico7352]

Where did you buy your ball bearing?

[@JohnBarthe-v5i]

Tank you very mutch you save me money

[@trentseaman3666]

Thank you!!

[@originaldanman]

Nice video except you left it the most important part. How did you get the 2 screws that hold the armarture back in? I managed after an hour but it was quite a challenge, and I'm a pretty handy guy, who can do almost anything. I guess that's why you didn't show it, probably took you an hour also. Everything else was cake compared to installing those 2 screws. Edit: How to install armature flange screws. Wedge two small pieces of styrofoam underneath each side of the flange and center it. Install armature slowly and carefully, while you line up at least one screw hole, the other should line up fairly easily as long as the Styrofoam doesn't slip. Did it in 5 minutes once I figured it what to do.

[@vladton5777]

I mentioned about tricky part to match those 2 screws and how did I managed to put them in. The rest is on your savvy. :-)

[@originaldanman]

Got it, so when you were almost done you talked about it, but not when you were installing it.

[@asakayosapro]

I saw that as well, and that is an extremely annoying piece to deal with. One way to deal with it is to insert the armature, position that flange with a pick or wooden dowels or wedges while keeping at least one of the screw holes aligned, then partially screw it with the appropriate fastener. Once screwed, simply rotate and screw in the other fastener, using the wooden wedges to hold it in place. I don’t even know how the manufacturers managed to get that done in the order of assembly, but that is really annoying, and it probably required some special robotic jig or other anti-repair stupidity to install that stupid thing.

[@conradheatwole7757]

I took the motor cover off and determined that the end bearing is rough and needs to be replaced. Can I just remove the bearing with a puller and tap on a new bearing while leaving leaving the Armature in place, or do I have to remove the gearbox assembly and remove the armature first?

[@altstuder]

I assume you found your way through a year later but if you didn't, let me know. You can, and should try. It is difficult getting the new bearing seated fully. If you remove the entire armature, getting the front bearing keeper reassembled is the most ridiculous pain in the ass I've ever encountered.

[@conradheatwole]

Thanks for the reply. Maybe can help the next person as well. I think that's what I did ... really I don't remember since that was a year and 20 projects ago... 🙂

[@johnnymccloy1163]

You don't sh9w how you replaced the screws on the armature fan??? Can't get them to tighten or li e up properly.

[@kriswaygood9168]

So glad I found this... and canadian to so you know my frustration.. You mention you went to princess auto for the bearing.. do you recall the dimensions?

[@vladton5777]

See the dimensions in the description above.

[@kraquin]

It's almost always the rear bearing. I would have checked it first. You can remove the bearing and put a new one on without removing the armature. Just make sure you remove both brushes before taking off the rear cap.

[@mmypainting]

Thanks for the help.

[@hilobob15]

Well done. Thank you

[@waldoalfonso2002]

good job, can you let me know the bearing size please

[@vladton5777]

The internal diameter of this ball bearing is 10mm and external diameter is 30mm.

[@waldoalfonso2002]

@@vladton5777 thanks, good video

[@marcusantarticus]

Thank you So much for taking the time to do this video. Solved my problem immediately!

[@kdzmcwilliams]

Thanks.

[@vladton5777]

I am glad the video was helpful to you.

[@tonyp9609]

Thank You

[@barefootarts737]

My 4000 has a clip w 2 screws on the FRONT BEARING. It was completely skipped. One frame the whole armature is out. The next frame the front end is in and no instructions on that flange on the front bearing. Not helpful in the slightest. This was the only piece of information I needed for the entire assembly.

[@altstuder]

Same for me, although he did mention that getting that bearing keeper re-threaded was very tricky and he said he used a little hook through the housing. It took me hours to figure out a way to reassemble- a bent piece of wire, a string threaded through the whole assembly and a lot of cursing.

[@originaldanman]

Yep, just sent a comment on that very thing. This is my third time replacing that bearing. I don't even remember how I did it, took me over an hour.

[@originaldanman]

​@@altstuderJust in case you have to do it again I figure it a much easier way. Edit: How to install armature flange screws. Wedge two small pieces of styrofoam underneath each side of the flange and center it. Install armature slowly and carefully, while you line up at least one screw hole, the other should line up fairly easily as long as the Styrofoam doesn't slip. Did it in 5 minutes once I figured it what to do.