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Eliminating Blade From A Riding Mower.


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#1 CRFarnsworth OFFLINE  

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Posted December 05, 2013 - 09:45 PM

I've been redoing an old Craftsman vertical shaft riding  mower with the intent of letting the grand children ride it  I'm thinking of removing the blade for safety.  Question is how this will affect the engine operation, since its rotating mass acts as a flywheel.     Should I replace it with something of equal weight?  (such as a small pulley or something fabbed on the lathe)    Or would it need to be heavier to compensate for the inertia generated by the end of the spinning blade?  (24" blade)  Any ideas?  Rick


Edited by CRFarnsworth, December 05, 2013 - 09:52 PM.

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#2 Chopperhed OFFLINE  

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Posted December 05, 2013 - 10:04 PM

Nope, It won't bother the engine at all.

The extra rotating mass is just drag.

The engine has a big enough flywheel to run fine.
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#3 lyall ONLINE  

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Posted December 05, 2013 - 10:08 PM

you can remove the belt to the deck, that is if it has a belt


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#4 CRFarnsworth OFFLINE  

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Posted December 05, 2013 - 10:09 PM

I wondered if i was over thinking the situation.  Rick


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#5 CRFarnsworth OFFLINE  

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Posted December 05, 2013 - 10:12 PM

you can remove the belt to the deck, that is if it has a belt

It is a vertical shaft engine, with the blade attached to the crankshaft. It does have a belt to the transmission but I need that one Rick


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#6 superaben OFFLINE  

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Posted December 05, 2013 - 10:15 PM

Rick, all I know is that sometimes on vertical shaft mower engines the blade does act like a counterweight.  I know many push mower engines will shear a key if it is started without a blade on it. 

 

Ben W.


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#7 WHdbJD ONLINE  

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Posted December 06, 2013 - 05:44 AM

I wondered if i was over thinking the situation.  Rick

You cant overthink things when it comes to grandkids and safety.


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#8 MH81 ONLINE  

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Posted December 06, 2013 - 12:24 PM

Rick, it will be harder to start and more of a chance of stalling without it. Low rpm's could cause issue also and, as has been mentioned, shearing keys can happen especially with a backfire while starting.

A rotating mass of any kind will help, just keep in mind that anything under there that is turning can grab the jump rope left in the yard and wrap it up faster than scat.
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#9 CRFarnsworth OFFLINE  

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Posted December 06, 2013 - 06:20 PM

Been thinking i may just turn the blade upside down and block off the discharge chute.  Also leave the deck as low as possible.  Rick 



#10 Bruce Dorsi ONLINE  

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Posted December 07, 2013 - 07:49 AM

Been thinking i may just turn the blade upside down and block off the discharge chute.  Also leave the deck as low as possible.  Rick 

 

This is still not the safest way to do it.   .....The upside-down blade will still mangle a hand or foot.  .....The blocked discharge chute will not prevent a hand or foot from going under the deck elsewhere.  .....The lowered blade/deck will be more likely to cause the blade to hit humps, thus shearing the flywheel key.

 

You mentioned possibly putting a pulley onto the crankshaft.  ....This is a good way to add mass.  ....A large pulley is better than a small pulley.

 

You also mentioned a lathe, so if you have access to one, a round disk would be good as long as it is securely fastened to the crankshaft.   


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#11 Chopperhed OFFLINE  

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Posted December 07, 2013 - 08:29 AM

The way I see it, If the tractor runs with the blade disengaged, it will run fine without it.

 

I have a 15.5 B&S that runs like a swiss watch with out the blade or deck attached

 

A garden tractor is not a push mower.



#12 MH81 ONLINE  

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Posted December 07, 2013 - 11:27 AM

The way I see it, If the tractor runs with the blade disengaged, it will run fine without it.

I have a 15.5 B&S that runs like a swiss watch with out the blade or deck attached

A garden tractor is not a push mower.

This unit is like a push mower. The blade is directly attached to the bottom of the engine.

It is a vertical shaft engine, with the blade attached to the crankshaft. It does have a belt to the transmission but I need that one Rick


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#13 Chopperhed OFFLINE  

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Posted December 07, 2013 - 11:33 AM

This unit is like a push mower. The blade is directly attached to the bottom of the engine.

I stand Corrected, I guess the only way to find out is to try it.

 

I've never seen a riding mower that you couldn't disengage the blades.


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#14 CRFarnsworth OFFLINE  

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Posted December 07, 2013 - 01:52 PM

I stand Corrected, I guess the only way to find out is to try it.

 

I've never seen a riding mower that you couldn't disengage the blades.

Near as i can determine the rider is a 4 hp model from 1960. 

Might have to put some Farmall decals on it!

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Edited by CRFarnsworth, December 07, 2013 - 01:57 PM.

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#15 CRFarnsworth OFFLINE  

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Posted December 07, 2013 - 01:55 PM

I found a pulley that is  half again the weight of the blade.   Will use that as a starting point and do some trial and error.  hopefully not much error!  Rick


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