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 35mph 633a?

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LJHunter429
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PostSubject: 35mph 633a?   35mph 633a? Icon_minitimeFebruary 8th 2021, 7:50 pm

I am wanting to build a Sears suburban mud tractor to keep up with ATVs at the Hatfield and McCoy trails. I wanted to know if there is an internal trans mod or what pulley ratio to use to get to 35 mph. Any ideas?

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MightyRaze
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PostSubject: Re: 35mph 633a?   35mph 633a? Icon_minitimeFebruary 8th 2021, 8:49 pm

I used a 9 inch pulley to achieve around 30 with the Craftsman AYP variant of the Roper 633a.  It's possible to do more, but that would require cutting out the pulley hub from the transaxle as it is tapered.  Then welding that hub to a new smaller pulley.  I would also upgrade the ball joints to heim joints in your steering to make is safer.


35mph 633a? Sig115PROJECTS:
     Marshal ........93 Craftsman GT6000      
     Red Bandit ...72 Wheel Horse Raider 12
     Dirty Rat........77 Sears Suburban
     Bowser..........01 Murray Widebody LT
     Other projects
Have a question? Ask me! Type in "@MightyRaze" in your post!
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LJHunter429
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PostSubject: Re: 35mph 633a?   35mph 633a? Icon_minitimeFebruary 8th 2021, 8:57 pm

@MightyRaze good call on Heim joints. I will look into a9 inch pulley for mine. Thanks!

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mr.modified
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PostSubject: Re: 35mph 633a?   35mph 633a? Icon_minitimeFebruary 9th 2021, 9:43 am

633's are geared kinda low. I was looking for the gear ratios in high range because I checked them fairly recently. Can't seem to find it though. You can mark the rear axle and mark the input shaft or pulley, then count how many turns of the pulley it takes to spin the rear axle once in 3rd high range. Then you need to know your rear tire outside diameter, so measure around the outside of the tire. With that info, you can figure out what kinda pulleys you need roughly if you look online. It gets semi confusing but there's various calculators and things online you can use too. Figure like 4000rpm for the engine if ungoverned? 3600-4000 I'd say for max speed if you've got a stock engine.

I used a jackshaft on mine so that's more pulleys involved, but I'm geared for about 19mph. Just ended up that way, I didn't really plan it. @MightyRaze You used a 9" pulley on the engine? You got a belt clutch to work that way?

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PostSubject: Re: 35mph 633a?   35mph 633a? Icon_minitimeFebruary 9th 2021, 10:31 am

mr.modified wrote:
@MightyRaze You used a 9" pulley on the engine? You got a belt clutch to work that way?

Stock clutch with belt twist even!

35mph 633a? Img_2365

But I digress. Back to topic.


35mph 633a? Sig115PROJECTS:
     Marshal ........93 Craftsman GT6000      
     Red Bandit ...72 Wheel Horse Raider 12
     Dirty Rat........77 Sears Suburban
     Bowser..........01 Murray Widebody LT
     Other projects
Have a question? Ask me! Type in "@MightyRaze" in your post!
35mph 633a? Sig21435mph 633a? Sig314

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Rustbucket Garage
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PostSubject: Re: 35mph 633a?   35mph 633a? Icon_minitimeFebruary 12th 2021, 12:48 pm

Whatever you do...glasspack or straight pipe always makes it go faster lol!

On another note...got pictures?

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LJHunter429
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PostSubject: Re: 35mph 633a?   35mph 633a? Icon_minitimeFebruary 12th 2021, 12:59 pm

@Rustbucket Garage I don't have pictures because I don't have the tractor yet. The guy in trying to buy it off of won't respond to me

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Rustbucket Garage
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PostSubject: Re: 35mph 633a?   35mph 633a? Icon_minitimeFebruary 12th 2021, 2:51 pm

Yeah I hate it when people do that. Hope it works out better for ya! 35mph 633a? 2731072446

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LJHunter429
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PostSubject: Re: 35mph 633a?   35mph 633a? Icon_minitimeFebruary 12th 2021, 2:57 pm

Thank ya! Means a lot.

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PostSubject: Re: 35mph 633a?   35mph 633a? Icon_minitime

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