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Tractor Talk Discussion Forum

CUSHMAN CONVERSION

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OLDTELEMAN

01-29-2005 09:19:23




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I have a 1958 Cushman 780 3 wheel truckster frame and am in need of suggeestions for a small garden tractor engine and drive train transplant.Diesel and hydrostat would be neat for light use and tractor show hauling.Any one have any feasible ideas ?




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Bob Semrau

01-30-2005 18:03:05




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 Re: CUSHMAN CONVERSION in reply to OLDTELEMAN, 01-29-2005 09:19:23  
I bought a Briggs 16 HP Vanguard Twin on Ebay that was advertised as being suitable for a Cushman conversion. The model number was 303447. It worked great in my Case 1816B.



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cdmn

01-29-2005 20:58:22




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 Re: CUSHMAN CONVERSION in reply to OLDTELEMAN, 01-29-2005 09:19:23  
It wouldn't surprise me if the transmission and rear axle for that model were derived from the Crosley car. Those items are still available from Crosley vendors. If you had the Crosley bellhousing and transmission, flywheel and clutch assembly, you could probably mate it up to any engine. I think the later Cushmans used OMC engines, which are probably still available for a price. There are lots of Simplicity and Bolens garden tractors that used 2 cyl opposed engines. Some small Bobcats. Costs a lot for good ones. If you want to go foreign, there are millions of such trucksters in the Far East. Google for Indian-made engine units. Of course, the best two cylinder aircooled engine ever built was by Citroen. Don't know if they had an industrial model with a governor.

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RN

01-30-2005 00:44:01




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 Re: CUSHMAN CONVERSION in reply to cdmn, 01-29-2005 20:58:22  
Best 2 cyl air cooled engine? How about BMW? Car had a 600cc version about same size Citroen 2CV but located in the rear, looked like development from R60/2 motorcycle engine. RN



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alan mydland

01-29-2005 22:52:25




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 Re: CUSHMAN CONVERSION in reply to cdmn, 01-29-2005 20:58:22  
I have three trucksters one on the street now. there great and tuff. I need help i have two self made tractors. one hydrylic direct drive articulated and one hydrylic with subaru front drive hydrylic articluated. my problem is trucksters are to fast. hydrylic is very speed ajustable. my tarket speed is 3/4 to 1 1/2mph. I do not need to sit on top and drive but walk along behind. is the3re anythin out there to buy or should i keeep building

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RN

01-29-2005 16:12:43




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 Re: CUSHMAN CONVERSION in reply to OLDTELEMAN, 01-29-2005 09:19:23  
Truckster layout Cushman? If I am thinking of the right vehicles- You have or had a flat twin Onan under the seat area? Or a Briggs large single located again under bench seat? Live axle at back with leaf spring suspension, short drive shaft, 3 speed transmission bolted to flat twin engine? Single cylinder model I think had Comet belt drive auto trans and chain drive to solid mount axle. You indicate 'frame' only- perhaps a large MTD transaxle from a 15 to 25 hp tractor bolted to frame and flat twin Briggs engine under seat area. If single cylinder frame- Hydrostatic Peerless transaxles are around, horizontal or vertical single 12 to 16 hp Briggs or Tecumseh in seat area. A drive train I know- brothers 'Ranch King' mower has a vertical 16hp OHV Briggs with a belt drive to select shift on the go transaxle. Low profile engine would probably fit under seat area, transaxle shift lever could be operated by cable. Another possible drive train from a snowmobile might be usable- Rotax single or twin to Comet belt drive transmission with jackshaft then belt or chain to Peerless axle, or old sears suburban 3/2 speed transaxle. This drive train seen on hot rod puller garden tractor. Check the salvage yards/ back rooms of small engine shops for engines and transmissions available, bring your tape measure. ATV back axles/engines might be considered also- suspension and brakes could be handy to have, track width wider than some garden tractors, wheels and tires may be more available. RN

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rustyj14

01-29-2005 13:29:49




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 Re: CUSHMAN CONVERSION in reply to OLDTELEMAN, 01-29-2005 09:19:23  
If you could find an engine/ transmission arangement from an older foreign car, i think that would be the way to go. You'd have to design motor/ transmission/ suspension parts and application ideas, Or use the 4 cylinder, standard transmission (In-line arrangement). It would take some thought! I'm not familiar with the machine you mentioned, but some trial and error will have to be done! Sounds like an interesting project--something i would have tackled 30 some years ago, but not now! Watch "Monster Garage" or the other shows like it--they do all kinds of things with machinery! You just need some imagination, a place to work, a pile of tools and materials, and lots of time! Of course, if you don't need a lot of power, a 12 h.p. engine, with a chain or belt drive to the tranny or rear drive with a clutch arrangement, would probably be easier to do. Try it--it might just work! Experiment with the thing--that's what most of us do in a case like yours! Rustyj

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