The Kubota M6800 has been mostly in the shed since we bought it as work and weather meant there just wasn't a lot of time to work on or with it. We have been using it some to move hay which has worked out well. It was slow cranking when we bought it and was getting a bit worse so yesterday I decided to pull the battery, clean posts and terminals, check the ground connection etc.
Most of that looked ok but the ground may have had a little corrosion at the strap to frame connection. The positive battery cable had a replacement bolt on cable end and it was made for a smaller cable so that wasn't the best connection. I didn't have the correct cable end with me but will get one or may just measure the cable and buy a new cable. . . All of that helped the cranking some but reading the manual on the tractor also gave some insight.
For years, when we park the tractor after moving hay we lowered the 3ph hay forks to the ground to keep people or cows from getting hurt. Then with the tractor off, we'd raise the control lever back to a high position so the forks would come up instead of forgetting about them and dragging them when backing out of the shed. With the red tractors, that wasn't an issue. Start the tractor and in a half second or so the forks would come up. There seemed to be almost a delay circuit in the hydraulics so the engine could come up to speed.
The Kubota manual specified to always start the tractor with the controls in the lowest position. This tractor has a physically smaller starter and I guess the additional starting load of the hydraulics is too much even with just the empty forks on the back.
Different color, different procedures. Maybe I need to read the entire manual! (Actually, I've read it once but quickly and just need to go back and look for the fine print.)