Hi Mathias-
Here is some info I got directly from DynaMechtronics (Roberto) about replacing the bearings:
I am attaching the files he sent me below. I would recommend removing the spindle cartridge before you do anything else. See the diagram--remove the 6 M6 bolts at the spindle nose (#11) first. Then you can use something to pound it out from the top--I used an aluminum tube with about 2-1/2" ID so I wasn't pounding on the upper bearing in case it was still good.Hello Mr. Dan to replace the bearings , you may need an oil injector to remove the ring plate #13 is the location where you will be injecting the oil to pressurize it in order to pop it (loosen it) then you can remove the rest..
See attached as a reference only and to give you an idea of what is needed..
Now for the Bearings on the Spindle , there are only two types inside the Spindle cartridge.
Fig# Qty. Specs.
#10 x 1 NN3007K
# 4 x 3 7008AC/TBTB
The Dyna Part # T0507-03007-FAS
We do not have it in stock ,but you can check the following links and see which one will be better in terms of cost for your Company.
.SKF NN-3007-KSP BEARING | eBay
SKF NN 3007 K-SP,NN 3007 K-SP bearings,Cylindrical Roller Bearings NN 3007 K-SP,Size -35(mm)*62(mm)*20(mm),
https://www.123bearing.com/bearing-NN3007K-KOYO.php
https://www.alibaba.com/trade/search...chText=nn3007k
Fortunately we still have some of the 7008 Cylindrical Roller Bearing in stock Total of 6 pieces.
The Dyna Part #T0501-07008-BAW
Cost Each : $150.00 usd
Stock : 6 Pieces Available
Let us know if you will be interested on purchasing this one from us.
If not then you could probably search on the web to find some more
Which may be more economical for your company.
Best Regards, Roberto
Dyna Mechtronics.,Inc.
1435 Koll Circle Bus. Pk. Suite # 107
San Jose, CA 95112
Tel: (408) 452-1010
Fax: (408) 452-1099
E-mail: services@dynamechtronics.com
If you get anywhere with this keep us informed--I have bad bearings in one of mine as well (I bought two at the same time and swapped the good spindle from one I have in storage into the one I am currently using) so would be interested in your progress. I don't think it's something I would really want to do myself as I understand it requires a lot of experience and know-how to do spindle bearings right, but if you've got what it takes it would be nice to see it done.
If you do remove the cartridge let me know, I'll tell you how to get it back in pretty easily. Actually there's not much to it, I put the cartridge in the freezer for a few hours while placing a space heater on the spindle casting overnight. It slipped right in easily; without doing it this way it's a real PITA otherwise.
Dan