I have a Kubota Bx1850 with just 10 hours on it. my problem is the speed control does not return all the way back to nutral position. it returns back to a slow forward movement i have to put my foot under the pedal an lift it to bring it to a full stop. Ive greased the fitting but it does not seem to help. any one with an 1850 experience this problem? any quick fixes?