The Tuul Crib 7,336 #1 Posted January 25, 2019 So I'm redoing my 1067 and it originally had a 6 " pto on it . I'm thinking about stepping up to a 7". I do have some concern however. All bolts up fine and goes together. What I'm thinking about is will this effect the speed of the blades on the mower deck. Will it slow the blades down some? Share this post Link to post Share on other sites
Achto 27,505 #2 Posted January 25, 2019 47 minutes ago, The Tool Crib said: Will it slow the blades down some? This would actually increase you blade speed. 2 Share this post Link to post Share on other sites
Ed Kennell 38,023 #3 Posted January 25, 2019 A larger diameter drive pulley will increase the belt speed and the driven pulleys RPM. 3 Share this post Link to post Share on other sites
The Tuul Crib 7,336 #4 Posted January 25, 2019 I guess that wouldn't hurt in a sense because it would blow it out the side discharge a whole lot better right? Share this post Link to post Share on other sites
Ed Kennell 38,023 #5 Posted January 25, 2019 Increasing the mower blade RPM will increase the air flow. The negative may be shorter spindle bearing life and more vibration due to blade unbalance. Do the 6" and 7" PTO bells actually have different size V pulleys? Share this post Link to post Share on other sites
The Tuul Crib 7,336 #6 Posted January 25, 2019 (edited) OK my next question is then does anyone know the difference in size of the pulley diameter between the two? Edited January 25, 2019 by The Tool Crib Share this post Link to post Share on other sites
oliver2-44 9,693 #7 Posted January 25, 2019 The real question is why are you wanting to change sizes? Step cautiously when you are increasing mower blade speed. Blades are designed for an rpm range, and the higher rpm and vibration could cause catastrophic blade, bearing or shaft failure. 1 Share this post Link to post Share on other sites
The Tuul Crib 7,336 #8 Posted January 25, 2019 I guess to reason being is what is available in my parts bin. Have some extra parts it made sense in that respect. I don't have a six inch clutch disc. I do have a seven inch set up. Share this post Link to post Share on other sites
pfrederi 17,669 #9 Posted January 25, 2019 Interesting the larger pulley (inner one) is the same size on both the 6" and 7" PTO measured at the bottom of the V. however the smaller pulley(outer one) is significantly different. 6 " is 2-1/2 inches and the 7 " is 3-1/4" Again measured at the bottom of the v. So no speed changes for the mower decks but the 7" will speed up your Snowblower 3 Share this post Link to post Share on other sites
The Tuul Crib 7,336 #10 Posted January 25, 2019 For me there is no chance that I would ever use a snow blower in my setting. Blade only. Share this post Link to post Share on other sites
Sarge 3,463 #11 Posted January 26, 2019 22 hours ago, pfrederi said: Interesting the larger pulley (inner one) is the same size on both the 6" and 7" PTO measured at the bottom of the V. however the smaller pulley(outer one) is significantly different. 6 " is 2-1/2 inches and the 7 " is 3-1/4" Again measured at the bottom of the v. So no speed changes for the mower decks but the 7" will speed up your Snowblower 2 I found that one out the hard way and burnt out the auger bearings - they were already on their way out but the extra blower rpm's was evidently too much. If I hook it up now with that larger clutch/pulley diameter that single stage really screams. Might not be a good long term idea - but it sure does toss that snow. Sarge Share this post Link to post Share on other sites
