Live Pto For Smaller Tractor

Live Pto For Smaller Tractor POWER TAKE OFFS (PTO'S) Power Take Offs (PTO's) 21-2-8 "I built it to give smaller, 20 hp size tractors like my early 1950's Allis Chalmers C more versatility. I use the tractor to mow 10 to 12 acres of turf every week," says Ralph Johnson about a "live" pto system he built to drive a belly-mounted mower. The idea earned him $375 in prize money in the inventors' contest at last fall's Outdoor Farm Show near Burford, Ontario. The pto direct drives off the tractor's crankshaft. To do so, Johnson extended the driveshaft 8 in. with a 1-dia. shaft mounted on the crankshaft's pulley. He then mounted a 6-in. dia. centrifugal clutch, which spins at the same rpm's as the crankshaft, on the end of the shaft extension. He mounted a direction reverser, a 1 to 1 gearbox, on front of the tractor so the pto shaft rotates clock-wise to drive the 6-ft. wide Douglas mower deck in its belly-mount position. A #50 roller chain and sprocket reduction drives the gear box in the correct drive ratio. For safety, the pto is designed to automatically engage at over 700 rpm's and disengage at under 700 rpm's. Johnson built the pto system, including a sheet metal shield over the gearbox, for less than $1,000 (Canadian) out of materials he bought at a commercial parts store. He's installed similar systems on an Allis B and an International C. Contact: FARM SHOW Followup, Ralph Johnson, Rt. 1, Belmont, Ontario, Canada NOL 1BO (ph 519 765-4545).

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