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1050 pulley won't stay aligned

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#1 mhubel OFFLINE  

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Posted April 12, 2015 - 01:26 PM

I have a 1050 Bolens with a pulley alignment problem. The pulley on the engine slides toward the engine after about 10 minutes of use. The result is misaligned belts. I have tightened both setscrews on the pulley to the point that the Allen wrench is about to snap. The pulley moves until it is against the engine bearing. 


Has anyone else had this happen? Any suggestions to fix it?

#2 Bruce Dorsi ONLINE  

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Posted April 12, 2015 - 02:46 PM

This does not normally occur, so here are some things to consider:


Is the bore of the pulley worn?


Is the key, keyway in the crankshaft, or keyway in the pulley worn?


Is the crankshaft a smaller diameter than original?


Sometimes a burr may form at the bottom of the hole for a setscrew. ....This can prevent the setscrew from tightening against the shaft, yet the set screw appears to be tight.


If the lower pulley(s) are not in their proper position, they can cause misalignment of the belts, which causes a pulley to move.


If the engine shaft is parallel (in two planes) to the lower shaft, and the pulleys are properly aligned, there should be no force to cause the pulley to move.  ....Rotational force will not cause a pulley to move, unless something is out of alignment.


To help eliminate movement of a pulley, a shallow depression (hole) drilled or filed into the shaft will accept the tip of the setscrew and prevent shifting of the pulley.

  • blackjackjakexxix said thank you

#3 Auburn David OFFLINE  

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Posted April 12, 2015 - 02:59 PM

I did have this problem once,it was an alignment issue with the engine,I fixed it with a couple of spacers.

#4 Deerlope OFFLINE  


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Posted April 12, 2015 - 06:03 PM

Put in new set screws.

#5 Bolens 1000 ONLINE  

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Posted April 12, 2015 - 07:10 PM

I had a few that would move on my, generally when I doubled up on the setscrews I was fine.