Am I correct is saying that the small John Deere tractors have Yanmar
diesel engines and Yanmar makes the JD 3038e tractor for John Deere?
If you have a Yanmar in your Deere, then be glad for it.
Here's a story of what happened with our John Deere skid loader with a Yanmar engine:
The kid helped me do an oil change, then I asked him to hop in the skid and start it up, wanting to get it to operating temperature so we could check for leaks.
You know how quickly teenage bodies can move. He started the engine and then hopped out in almost the same motion. "It's beeping at me!" He said.
"Don't worry. It's just the occupancy sensor. It's going to keep beeping until you get back in and lower the lap bar."
It kept beeping and we ignored it as we started putting away our tools, taking our time. Then we started cleaning up the shop.
Imagine my horror when I picked up the gallon jug of motor oil AND IT WAS STILL FULL!
"Shut it off! Shut it off!"
It wasn't beeping because of the occupancy sensor. It was beeping because we didn't refill the oil, and there was no oil pressure. And it probably ran that way for 15 minutes.
I figured the damage was already done, so no harm in filling it with oil and trying to start it.
Our mistake was five years ago, and that motor continues to run fine. I'm amazed.