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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Re: Oliver 77 a little more clutch help??????

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Author  [Modern View]
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02-09-2013 15:24:48

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   The flywheel is the same part number for the Row Crop, Standard and Industrial.  The Industrials had 11" clutch disc and pressure plate.  When the RC or STD. tractor was built you could order a heavy duty clutch and it was the 11" clutch assembly.  Most flywheels have both sets of holes drilled and tapped, all you need is the clutch disc and pressure plate.    I assume that you are looking at increased horsepower for pulling.  The clutch does not transmitt horsepower, just transmitts torque. Higher RPM in your engine progbably doesn't increase torque, bigger cubes and or cams do.  The clutch's ability to transmitt torque depends upon: type of material on the disc, square inches of surface and the clamping presssure.  That said you can go to the larger pressure plate and disc.  The disc can be relined with more agressive material and/or you can replace the springs in the pressure plate with stronger springs.  The Fleetline shop manual lists the springs and their tension and identifies them by color code.  If it is a pressure plate that has had a lot of service, it has probably gotten hot at some time in it's life, the heat has reduced the springs tension.  I don't remember which models for sure, however some pressure plates had empty places for springs.

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