I have a 2510 and a 3010 with the same problem. Neither will move in 3rd gear. It seems they try to engage but then nothing. All other gears on both tractors work fine both forward and reverse. No issues. 3rd gear has probably had the most use of all gears on both tractors if that helps.
Thank you
I do not have a shop manual for this tractor. It has developed an oil leak on the base where the oil filter screws on. There are two metal oil lines about the size of a penny that run into the base of the oil filter housing. The lower line is leaking where it joins the base. Due these lines...