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MY Kubota R420 seems to move slower going up hills or when pulling?

My kubota r420 does not perform well. It seems to slow down going up hills or when pulling something. The engin holds it RPM but it slows down speed wise. Is this a hydrolics problwm?
Gary Chapman, May 2013
Replace the belts or check them out.

Johnny, March 2014
On a car this would be typical of a clutch problem - does your tractor have a conventional clutch?

Anyway - the engine revolutions are not reaching the wheels - there's slippage in the system.

Peccavi, May 2013
link Click here to see other fixes for Kubota.