Questions about replacing bearings in a Makita 3612BR - Router Forums
 
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post #1 of 9 (permalink) Old 12-21-2014, 10:33 PM Thread Starter
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Default Questions about replacing bearings in a Makita 3612BR

Hello folks

Admins, could you please move this thread if I've posted it in the wrong spot. I couldn't find a sub-forum about router repairs, so I posted under General Routing.

A good friend of mine has given me a Makita 3612BR, which has been quite heavily used (and not very well maintained) in a skateboard making factory. When the router is switched on it makes a very unhappy sound I strongly suspect this router needs new bearings, among other things.

I can't yet post photos on the forum so I'll try describing this with text, which is something I'm not particularly good at. I hope the following makes sense...

So far I've dismantled the router to a point where the next step is to remove the armature from the lower housing. I've made a press out of 2X4 and a couple of bolts (gasp) to try to push the armature shaft out of the bearing in the lower housing, but it seems to take a surprising amount of force, and so far the armature hasn't moved at all as far as I can see.

I've studied some diagrams and parts lists describing how the 3612BR is built, and it appears to me that there are no grub screws or roll pins etc. holding the lower bearing onto the armature shaft. It seems to be simply pressed on, but the amount of force I'm applying with no result has me wondering if I've missed something?

I've decided it's time to ask you folks for some advice before I risk breaking something. Any help you can give me will be greatly appreciated!

Thanks for your time
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post #2 of 9 (permalink) Old 12-22-2014, 01:51 AM
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Glenn
You can post pictures now provided they come from your computers hard drive.
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post #3 of 9 (permalink) Old 12-22-2014, 02:57 AM Thread Starter
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Glenn
You can post pictures now provided they come from your computers hard drive.
Thanks for that clarification John.
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post #4 of 9 (permalink) Old 12-22-2014, 05:10 AM Thread Starter
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I've attached a photo of the router as it is. I'm having trouble getting the armature free of the bearing in the lower housing.
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post #5 of 9 (permalink) Old 12-22-2014, 07:22 AM
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Originally Posted by Grub View Post
Hello folks

Admins, could you please move this thread if I've posted it in the wrong spot. I couldn't find a sub-forum about router repairs, so I posted under General Routing.

A good friend of mine has given me a Makita 3612BR, which has been quite heavily used (and not very well maintained) in a skateboard making factory. When the router is switched on it makes a very unhappy sound I strongly suspect this router needs new bearings, among other things.

I can't yet post photos on the forum so I'll try describing this with text, which is something I'm not particularly good at. I hope the following makes sense...

So far I've dismantled the router to a point where the next step is to remove the armature from the lower housing. I've made a press out of 2X4 and a couple of bolts (gasp) to try to push the armature shaft out of the bearing in the lower housing, but it seems to take a surprising amount of force, and so far the armature hasn't moved at all as far as I can see.

I've studied some diagrams and parts lists describing how the 3612BR is built, and it appears to me that there are no grub screws or roll pins etc. holding the lower bearing onto the armature shaft. It seems to be simply pressed on, but the amount of force I'm applying with no result has me wondering if I've missed something?

I've decided it's time to ask you folks for some advice before I risk breaking something. Any help you can give me will be greatly appreciated!

Thanks for your time
go here for a picture of the inside of your router

Makita 3612BR Parts List and Diagram : eReplacementParts.com

del schisler
port st. lucie, florida
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post #6 of 9 (permalink) Old 12-22-2014, 09:21 AM
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Quote:
Originally Posted by Grub View Post
I've attached a photo of the router as it is. I'm having trouble getting the armature free of the bearing in the lower housing.
It looks like gunk on the shaft is preventing it going through the bearing. Clean off all the gunk then tap the shaft through the bearing, it may in fact remove the bearing if the shaft is frozen to the bearing. I do have a set of photographs showing the dismantling but I had a hard drive crash this morning and I'm in the process of setting everything up so don't have access to them at the moment.

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post #7 of 9 (permalink) Old 12-22-2014, 06:20 PM Thread Starter
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It looks like gunk on the shaft is preventing it going through the bearing. Clean off all the gunk then tap the shaft through the bearing, it may in fact remove the bearing if the shaft is frozen to the bearing. I do have a set of photographs showing the dismantling but I had a hard drive crash this morning and I'm in the process of setting everything up so don't have access to them at the moment.
Thanks for your reply Harry.

That photo was taken before I took to that thread with a wire brush. It's quite clean now, only an insignificant amount of surface rust remains. It's a valid point you're making, you guys would be horrified at the amount of fine, flour-like sawdust that came out of this router, and the dust was doing a great job of binding everything together.
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post #8 of 9 (permalink) Old 12-22-2014, 08:00 PM Thread Starter
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It's out!!

The armature is now free of the lower housing. All it took was brute force

Still a few hurdles to jump before I'll know for sure if the router is worth repairing, but this is a step in the right direction.

Thanks for the help folks
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post #9 of 9 (permalink) Old 12-22-2014, 08:03 PM
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Keep us informed how it works out, Glenn.

Makita is a loved brand by some on the forum (me included)...

James
Sydney, Australia
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I don't mind if other members disagree with my comments.
I don't profess to know everything, and I may learn something new.

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