I have a 2013 Mahindra 6110ST, I am the original owner. It currently has 518 hrs on it and has been mostly parked the last couple of years. The trouble (transmission) started a couple of years ago which is the reason its been parked. A former employee was hard on equipment and I am not sure if this is the reason for the problem or not. I recently changed the oil and filter, flushed the radiator and replaced the coolant, also replaced the hydraulic fluid and filter. The tractor starts and runs great, but the transmission is another issue. It has 12 forward gears and drives fine in low range (all gears) and lower medium range gears. If in a high medium range gear or high range (all gears), the engine revs up but the tractor will not move. Once the transmission heats up, it will hardly move no matter what range or gear. Prior to the issues, you could pull up on the 4x4 handle and it would lock into place, now it will not do that. You have to hold it into position to engage the 4x4. I have also noticed after driving it a short distance, when I pull the transmission dipstick, a blast of air comes out. Of course, my Mahindra dealer is not help.