Snowthrower Bearings

[RichInWalworth 0]

Question. I have a 1990 single stage snow thrower for my 312-8. I am trying to replace the bearings on the drive shaft. How do you remove them? I have taken out the set screw, soaked the collar in pb blaster, put some heat to them, pounded on them. etc. They will not move. Am I missing something? The only thing that is curious is, there is only one set screw in each bearing collar. There appears to be a second partially drilled hole but no set screw installed and it does not appear to be tapped. What gives???

 

Rich In Walworth

[WVHillbilly520H 10,373]

Sometimes there are 2 setscrews in the same hole, the top one locks the bottom from backing out...then once you are sure there are no more set screws using a good punch in the the other shallow drilled hole and your hammer try knocking it counter clockwise to loosen the collar from the bearing/s...then once you have the lock collar loosened you will still probably have to hammer the bearing from the shaft...if/when you finally get the bearing/s off the shaft you will need to use some emory cloth or sand paper to smooth the shaft before replacing with the new bearings, Jeff.

[wallfish 16,971]

  Rich

The Hillbilly gave good advice. Those are cam lock collar type bearings. Basically the set screw is holding the collar from turning. Turning the collar will unlock it from the shaft. Once you get it off and look at the collar and the shaft bore of the bearing, you'll see how it locks to the shaft.

 

[gwest_ca-(File Mod) 11,026]

When installing the bearing you use a round punch in the 2nd untapped hole to drive the collar in the direction of the shaft's normal rotation. Once tight you lock the set screw. A cam locks the inner bearing race to the shaft so they turn together.

When taking it apart you need to drive the collar in the opposite direction of rotation. The collar is a separate part so when loose it will slide down the shaft out of the way.

If the unthreaded hole is about 3/16" diameter use a 3/16" round punch at an angle in the hole. The hole just gives you a shoulder to take the punch blows to turn the collar on the shaft.

Hard to put into words.

 

Garry

[RichInWalworth 0]

Thanks to all. I kept thinking the non-tapped hole was a manufacturing defect. I learned something new. Now its time to test my knowledge and see if the collar/bearing comes off!