Question about Bosch 3107DVS Electric Sanders & Polishers

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How do I replace the fan assembly cannot hold armature assembly to get inner bearing out without damaging armature assembly

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If you are replacing the fan assembly because the internal thread that holds the rubber/velcro pad has stripped, there might be an alternative.

I had the same problem with my PEX 12AE, which I believe is a similar sander. I found that the hole is threaded a good bit deeper than the screw, so I got a longer screw and so far it's holding ok. If/when that fails, I might try repairing the thread with an insert.

Curious to know how you managed with your sander.

Posted on Feb 11, 2013

  • 3 more comments 
  • Lee Hunter Sep 14, 2013

    I have a new fan assembly and have opened the case but can find no obvious way to disconnect the old fan assembly from the shaft. I was hoping to see a slot for an allen wrench down the center hole. Don't think so. If I could get the old one off I could probably get the new one on.

  • Lee Hunter Sep 14, 2013

    3107 DVS

  • Lee Hunter Nov 02, 2013

    I tried attaching the pad with a 25mm long bolt. It lasted a few minutes. I can't find a store that carries a 30mm bolt. They carry only even numbers

  • YossiD Nov 03, 2013

    My repair with the longer screw didn't last too long either.

  • YossiD Nov 03, 2013

    My repair with the longer screw didn't last too long either. The easiest solution is to replace the entire Fan Assembly (Bosch p/n 2606610901), which is available online for $25.36 from ereplacementparts.com http://www.ereplacementparts.com/fan-ass... If you're a cheapskate like me, and you don't mind a challenge, you can replace only the bushing with the threaded hole, which Bosch calls a "Driver." It is Bosch p/n 2600329027, and you can get it at ereplacementparts.com for $6.88 http://www.ereplacementparts.com/driver-... Note: If you look up your model number on the ereplacementparts.com website you can see a parts diagram which is helpful when disassembling and reassembling the tool. You'll also probably want to replace the bearing (Bosch p/n 2610911986; $7.92 at ereplacementparts). This is actually a standard 6202 bearing that is used, among other things, on many roller blades, so you can probably get it anywhere. Being in Israel I ordered it from Deal Extreme, where it cost $3.00 including wordwide shipping http://dx.com/p/cyt-6202rs-sealed-ball-b... Replacing the Driver in the sander is a bit of a chore. The bearing is press fit on the driver and together they are held into the fan with a round leaf spring (Bosch p/n 2600190059 -http://www.ereplacementparts.com/washer-... With a small screwdriver you can carefully pry the teeth of the spring one by one to slowly inch the driver/spring/bearing assembly out of the fan. Be patient, it will work (at least it did for me). After removing the driver/spring/bearing assembly, you have to separate the three. Due the the press fir I couldn't remove the bearing from the driver. Also, the bearing was damaged (probably part of the reason that the threads in the driver stripped). I ended up having to cut the bearing off using a rotary (Dremel type) tool and a cutting disk. Next step is to assemble the new bearing to the driver shaft, with the spring between them. Make sure the teeth of the spring are pointed away from the bearing so it will side into the fan. I used a vice to press the driver into the bearing and I had a block of wood to protect the end of the driver from damage by the vice. Make sure that everything is straight and square or the driver won't insert properly in the bearing. Assemble the driver/spring/bearing assembly back into the fan. That's much easier since it's a much looser fit. Finally, reassemble the sander and you're done. It's a bit of a process, but it worked for me and it was very rewarding. But as I mentioned, it's much easier to replace the entire Fan Assembly p/n 2606610901. I didn't do that because here in Israel the assembly is much more expensive than at ereplacementparts (who's international shipping is expensive), and it would have been a special order from Bosch in Germany. The driver happened to be available locally from stock at a reasonable price, and as I mentioned above, the bearing was cheap from deal Extreme. I was lucky that I didn't break the leaf spring during disassembly since getting one of those would have been a problem. Anyway, good luck. Let me know how you manage.

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