I just bought a new Miva VA13 mini-excavator at auction and everything works fine, except when driving forward or reverse at anything other than full speed, it "bucks" really badly on both tracks.
The bucket movement is smooth, there is no jumping motion.
I'll try to keep the sordid story as short as possible..... I am running a MIVA mini ex with the Rato R420 engine. I added two computer type fans for cooling then a few days later found the battery dead (after about 25 hours of running). I recharged the battery then once running (3000+ RPM) I...