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Shaft Bent Inside? #5431415 05/17/20 01:45 PM
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yeehaw1960 Offline OP
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I'm running across a lot of Briggs motors that act like they have a bent shaft. I have one on the bench that vibrates, though the shaft looks as true as can be, and the blade isn't bent. Thoughts?

Re: Shaft Bent Inside? [Re: yeehaw1960] #5431437 05/17/20 01:59 PM
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ABN_CBT_ENGR Offline
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unbalance

Re: Shaft Bent Inside? [Re: yeehaw1960] #5431502 05/17/20 02:56 PM
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Or the key way on the Flywheel is sheered,,, which would be unbalanced???


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Re: Shaft Bent Inside? [Re: CT8] #5431513 05/17/20 03:00 PM
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ABN_CBT_ENGR Offline
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Originally Posted by CT8
Or the key way on the Flywheel is sheered,,, which would be unbalanced???


Yes that is a form of unbalance (load induced) along with static and dynamic plane

Re: Shaft Bent Inside? [Re: yeehaw1960] #5431514 05/17/20 03:00 PM
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oldhp Offline
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Blades get out of balance from sharpening and not re-balancing them. I've had to grind a 1/2" square piece out the end of a blade that was sharpened 1 time. It was a mulching blade, I just thought it shook because of the extra cutting of stuff under the deck. Nope. Out of balance right off the bat.


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Re: Shaft Bent Inside? [Re: CT8] #5431732 05/17/20 05:59 PM
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Lubener Offline
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Originally Posted by CT8
Or the key way on the Flywheel is sheered,,, which would be unbalanced???

Timing would be so far off it's likely not going to run. Won't affect balance.


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Re: Shaft Bent Inside? [Re: yeehaw1960] #5431734 05/17/20 06:01 PM
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Lubener Offline
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Bent or unbalanced blade is the most likely. Sometimes bent blades are difficult to see unless they are really in bad shape. Any broken fins on flywheel from someone trying to remove it improperly?

Last edited by Lubener; 05/17/20 06:04 PM.

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Re: Shaft Bent Inside? [Re: Lubener] #5431837 05/17/20 08:26 PM
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Donald Offline
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Originally Posted by Lubener
Bent or unbalanced blade is the most likely. Sometimes bent blades are difficult to see unless they are really in bad shape. Any broken fins on flywheel from someone trying to remove it improperly?


+1


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