Clutch and engine RPM

Anonymous-0 · Nov 27, 2010

Just rebuilt the engine and replaced all seals and gaskets on a Cub. It runs great but when I push in the clutch pedal (disengage) the engine RPM drops slightly. The engine RPMs pick up when the clutch is engaged and the tractor is moving forward. Is this a simple clutch adjustment or do I have a bigger problem?

Janicholson · Nov 27, 2010

there is a little less friction and lubricant viscosity in play with the pedal down, thus the tractor engine should have an easier time.
If the cub has a graphite based throwout bearing, it could be gone with metal on metal in the housing.
If it makes noise it probably is worn.
If the Throw out bearing is a Ball style, it or the fork could be contacting the clutch Pressure plate.
Again noise would be usually an indicator. The ball bearing could be seized and wearing the fingers. If it were mine I would adjust the clutch first (one and 1/2 inch travel befor it feels harder with hand pressure. If adjustment dis nothing, or it was close to correct already, I would split it to see what is going on. Jim

Jim Becker · Nov 27, 2010

The Cub uses a graphite throwout bearing. It is normal for it to pull the engine down a bit. Clutch adjustment calls for 1" free play at the pedal, 1/8" at the bearing/fingers.

mkirsch · Nov 28, 2010

Yes, perfectly normal.

Clutch and engine RPM

Anonymous-0

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Janicholson

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Jim Becker

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mkirsch

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