owatanna 345 jerky drive at low speed

[sundew]

Hi Just got an Owatanna 345 with the 4cyl Ford and have found it to be real jerky at low speeds. Changed hydraulic oil and filters, replaced the linkage bushings, and still jerks. Thanks for any help

 

[Tazza]

If it's hydrostatic drive, they need the higher speed or they growl and jerk. Kick the revs up to 1/2 to 3/4 and see how it goes.
Low tyre pressure can make it worse as well as sticky surfaces like bitumen or concrete do it to an extent, no matter what the engine speed is.