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fixed4free.com > Garden Tools, Lawn Mowers > Question
Garden Tools, Lawn Mowers

garden tools, lawn mowers, mower, hover, rotary, blade, strimmer, electric, petrol, fuel, engine 942 other questions

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Why does blade adapter keep breaking. Yardman Push Mower star blade.?

I put on a new mower blade and the blade adapter broke. I bought a blade adapter kit for my yardman 22' push mower with star blade. The blade adapter broke again. Why?

bob     June 2008
 Click here if you can answer this question 

This happened to me with a push mower, HOWEVER, there is a more likely cause than an imbalanced blade; especially if the mower struck something previously.

Problem:
-Does the mower jerk back when starting?
-Does it backfire sometimes through the carburetor?
-Does it continually break blade adapters?

Cause:
-A sheared flywheel key
Detail: When the mower struck whatever it hit, the shock of the engine slowing down and the inertia of the flywheel caused the flywheel to continue to rotate as the crankshaft continued to decelerate thus shearing the flywheel key which is normally suppose to keep the two parts locked together. This advances the ignition timing such that the engine will likely fire during the compression stroke. (as the piston is moving up the cylinder) When this happens it forces the piston back down which reverses the engines rotation and you feel this as the mower kicking back. The force can be great enough to break the blade adapter and rip the starter cord out of your hand.

Solution:
-Replace the flywheel key. (a 50 cent part)
From my experience this can be done in 30 minutes by a fairly mechanically inclined person. (you don't need to know all about engines to do this) Honestly, you will definitely need to use a flywheel puller and probably an impact wrench to pull off the flywheel.

For more information I found this site:
http://outdoorpowerinfo.com/repairs/flywheel_key.asp

***This link is NOT my site and I take absolutely no credit for its contents***

Spartan-117     April 2011
 Top

buy a blade balancer!!! if your blade isn't balanced the adapter will break - you will also feel the chord pull back on you. If you're going to sharpen the blade yourself, balance it. you can buy an inexpensive balancing tool at the hardware store.

matt schafer     October 2009
 Top
Basic laws of Physics show us that if a stationary solid object (eg, the edge of a brick) is struck by a lever arm (ie, the mower blade) spinning on the end of shaft (ie, the motor shaft), the force of that collision will be felt on the shaft in the form of a sideways force which usually results in a bent shaft; at which time the whole lever arm will start wobbling and pretty quick something fails (usually) catastrophically.

In order to prevent this catastrophic (ie, ex$pensive) failure, a blade adapter is often used to connect the mower blade to the motor shart.

A blade adapter is generally a casting or softer metal designed to break or bend with the mower blade strikes an object. The purpose is to provide something that will "give" or break before the motor shaft is bent.

There are no guarantees of course but at least the chances of ex$pensive damage are greatly reduced. You cannot leave out the blade adapter if one was originally included since the blade adapter also sets the blade height in relation to the mower housing, etc..

Replacement blade adapters and mower blades are usually available locally for $15-$25 and on-line for about half of that. Just make sure you have the right part and reference numbers to start with.

jim     July 2009
 Top
I have the same problems, too, but I have a B&S engine. When I pull the start line, it jerks back, too. Help.... if someone out there knows the answers.....

Eva     June 2009
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