Why did my 10K series machine suddenly lock up?

[Mc Wyndell]

My 10K series machine ran fine the day before, with good oil pressure and no overheating. The next morning, the engine was locked up. The hydraulic pump and torque converter turn freely. I’m checking the oil pan next. Any ideas what could cause this?

 

[Elixer G]

If the hydraulic pump and torque converter still turn freely, id suspect an internal engine issue like a seized bearing or piston before blaming the hydraulics.