[Max]

Thanks, Hazy. My tractor does have the hydrostatic drive so I can check that. I don't think the problem is with fuel as I could see into the fuel filter and fuel was being pushed through. I read on a few other sites that there could be an issue with the drive belt but I didn't find anyone who had the same symptoms as me so I don't know if that is valid info or not.

Cheers, Max

EDIT: just did a quick search and the transmission appears to be a sealed unit that doesn't require servicing for the life of the unit. So they say. If I want to check the fluid level then I need to start ripping things apart. But if that's what it takes...