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How much of a difference in blade speed?


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#1 TomLGT195 ONLINE  

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Posted June 12, 2018 - 10:56 AM

I'm working on redoing the 42" deck for my Ford/Jake LGT. The center pulley that gets power from drive belt and shares with the other two is shot. Here's the question; If I swap out the pulleys from the larger 50" deck the pulleys are obviously different due to blade speed. But will it effect it enough to not cut decent? The original pulley is 4-3/4" outside and the other is 5-1/2". If i run it at full throttle ( something i rarely do) will it cut good enough to cut the grass? I'm not looking for a show lawn. 

IMG_3446.JPG

 

And should I change all three pulleys so they spin equal?


Edited by TomLGT195, June 12, 2018 - 10:57 AM.

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#2 BTS ONLINE  

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Posted June 12, 2018 - 11:27 AM

WOW never seen a pulley rust through like that!


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#3 LilysDad ONLINE  

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Posted June 12, 2018 - 11:27 AM

The center blade will be turning about 86% as fast as the other two.


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#4 chieffan OFFLINE  

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Posted June 12, 2018 - 11:36 AM

I would try to stay as close to the original size as I could.  Engines and decks were designed to run at full throttle when mowing.  Your not doing the deck or engine any favors by pulling it harder at lower speeds.


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#5 framesteer OFFLINE  

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Posted June 12, 2018 - 12:23 PM

If you put the larger pulley on and ran the engine at 3600 rpm (typical full throttle), the blade rpms would be the same as running the original pulley with the engine at 3060 rpm.  If 3060 is about the speed you ran the engine with the original pulley, then the performance would be about the same as running the new pulley with the engine at 3600.

 

I agree with Chieffan, you should normally mow at full throttle.


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#6 propane1 ONLINE  

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Posted June 12, 2018 - 01:50 PM

I would think you would see no difference in the cut. Maybe, just maybe if you were doing a business and were cutting longer grass you might maybe might see a difference. but if you just cutting your own grass and its cut once a week say, I doubt there would be a difference. 

I don't cut at full throttle either on some of my machines, I know the reasons why you are suppose to , but I don't on some. I have found it saves fuel, and less noise. but it depends on the grass, at home its thin and at the other location its heavy, dry and wet make a difference, if ya cut once a week or once every two weeks. 

Fixed up a john deere LA145 for a fella this morning and cut my own grass with to test it out, 22 hp twin engine, jumpins I think it would cut the grass at an idle. I'm use to 16hp engines or less. 

 

Noel


Edited by propane1, June 12, 2018 - 01:53 PM.

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#7 Cvans OFFLINE  

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Posted June 12, 2018 - 02:02 PM

Thinking about the blade speed and baffles under the deck. All the blades are turning at the same speed and the baffles placed so the airflow doesn't flatten the grass. They also keep the grass moving toward the discharge. If some of the blades are turning slower than others your going to have less pressure and lift in some areas then others.

Anyway you could try it and see what happens. 


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#8 LilysDad ONLINE  

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Posted June 12, 2018 - 02:11 PM

Ya' know, in the amount of time we have been talking about this; someone might have put one of the correct pulleys in the mail and sent it off to Tom. Um-humh.

 

All I have are Wheel Horse pulleys. I doubt they will interchange.


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#9 KennyP ONLINE  

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Posted June 12, 2018 - 03:42 PM

I had to get new pulleys for my deck. Went to TSC and found everything. Had to weld the centers in.


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#10 TomLGT195 ONLINE  

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Posted June 12, 2018 - 07:00 PM

I had to get new pulleys for my deck. Went to TSC and found everything. Had to weld the centers in.


Any pics ? When you can please.
Would the die cast ones hold up?
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#11 Cvans OFFLINE  

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Posted June 12, 2018 - 10:41 PM

Would the die cast ones hold up? 

 

In a pinch the would work for a while. They don't hold up well when used around abrasive dust like you get when mowing. They aren't nearly as strong as steel or cast iron. 


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#12 WNYTractorTinkerer ONLINE  

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Posted June 13, 2018 - 03:27 AM

In a pinch the would work for a while. They don't hold up well when used around abrasive dust like you get when mowing. They aren't nearly as strong as steel or cast iron. 

Yeah-  ya might not get another 40 years out of it!


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#13 KennyP ONLINE  

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Posted June 13, 2018 - 05:01 AM

Any pics ? When you can please.
Would the die cast ones hold up?

I have a thread way back on redoing the deck. I'll see if I can find it.

 

Found the pics on the computer

Image024.jpg
Image025.jpg
Image026.jpg
Image027.jpg
Image028.jpg
Image029.jpg
Image030.jpg
 
I had to swap the centers. That's in the thread.
 
Found the thread. Post # 65 is on the pulley.

Edited by KennyP, June 13, 2018 - 05:23 AM.

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#14 firedudetl1 ONLINE  

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Posted Yesterday, 07:48 AM

knowing nothing about this particular deck, just wondering, if one blade is spinning at a different rate from the others, won't the blades at some point "hit" since the rotational timing is no longer the same?

the decks I've dealt with all have had overlapping blades so if they're not installed 90 degrees from each other... bang...


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#15 Cvans OFFLINE  

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Posted Yesterday, 09:17 AM

Belt driven blades should not be able to hit each other. The blades overlap but can't touch. That's why they are offset under the deck. 


Edited by Cvans, Yesterday, 09:18 AM.

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