Bypass variable speed switch on craftsman router

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Forum topic by Arvind posted 02-06-2016 01:23 PM 2039 views 0 times favorited 2 replies Add to Favorites Watch
View Arvind's profile


9 posts in 1075 days

02-06-2016 01:23 PM

Topic tags/keywords: router sears craftsman bypass switch variable speed

I have an old sears craftsman router (model # 315.175050) whose variable speed seems to have failed. I get only 40v on the white lead in pic1 going into the coils at max speed. As spares are not available I’d like to bypass the speed control. I am assuming that if i connect the brown lead (live 110v verified, second wire from left on board) to the white one in the same pic after removing both from the board, that should do it right?

The other question i have is about the switch – the leads are a little loose. One helpful comment on routerforum said i should be careful about it. Can i replace the switch (pic2) with a wire nut connecting all wires but neutral and a single on-off switch connecting wire nut to neutral? I am assuming that the switch connects all other wires to neutral – somehow unable to verify that as i am not able to remove wires easily even after inserting a safety pin into the holes. Is that assumption correct?

I’ve also attached a wiring diagram:

I got some idea from these posts but would like to hear some reassuring noises before i try it and toast my router :-)



2 replies so far

View mrg's profile


849 posts in 3233 days

#1 posted 02-06-2016 02:41 PM

Try Radio Shack or an electronics store that may be able to sell you something comparable for a few bucks so you still have speed control.

-- mrg

View Arvind's profile


9 posts in 1075 days

#2 posted 02-06-2016 04:57 PM

The reason the circuit is difficult to understand is that i am not able to open the motor housing to see which wires go to the field coil and which ones go to the armature. The top & bottom of the rusted plate in pic1 fold and go in & bend around the central plastic piece & that is difficult to remove. Any idea how to open it? Or which wires go to the brushes & which to the field coil?


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