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#11
08-23-2020, 10:24 AM
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The Quietline pulley is 4.25 inches. The earlier pulley is 5 inches. If yours is 4.25 then you would have to come up with a custom pulley to speed it up. Doing so would be at your own risk as the decks weren’t engineered for that.
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Doug Dad's 122 w/42" cast deck, spring assist, lights,weights, rear lift 1250 w/hydraulic lift, lights,weights, spring assist. 50C deck converted to an A with front wheels 44C deck converted to an A with front wheels. QA-36A 42" blade 
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#12
08-23-2020, 11:14 AM
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OK, here is the data. I am using two (2) constants. (A) Mower Blade length for the 44" deck of 15.12" (or 1.26'), and (B) 3600 RPM's.
Using the 4.50" PTO Diameter for the Quietline Tractors, the RPM's at the deck is the following: IH-59703-C2 Pulley 5.000" OD = 3240 RPM's IH-126393-C1 Pulley 4.375" OD = 3703 RPM's D x 3.14 x RPM's = Blade Tip Speed (Note: D is in Feet, and 3.14 is Pi) Thus, 15.12" (or 1.26') x PI = 3.956 3240 RPM's x 3.956 = 12817 Tip Speed 3703 RPM's x 3.956 = 14649 Tip Speed Maximum OSHA Tip Speed is 19000 IF............you wanted, and could find or Fabricate........ the center pulley could be reduced in your application to 3.375" and still fall under the OSHA Standard, based on a 3600 RPM Engine Speed. Hope this helps.
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[B]Roland Bedell[/B] CC Models: 100, 105, 1450, 782, (2) 784, & 2072 [SIZE="4"][B][COLOR="Red"]Buy:[/COLOR][COLOR="Blue"] Made in the USA[/COLOR][/B] [/SIZE]:American Flag 1:
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| 44a, accessories, mower, upgrade |
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