I have the Kubota Gas water cooled engine. The problem I have is when I start mowing I have to go around some obstructions, consequently I am going at the slowest speed and the engine is still cold. The Grasshopper keeps jerking going forward or backward with the hand controls oscillating back and forth if I don't have my hands on them. I have changed belts, hydraulic fluid and filters. Everything works fine at high speed and after it warms up, slow speed works fine also.
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