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PoTreeBoy, Vigo, and whitetiger, I closed the lowering speed control knob and the mower still dropped. Makes my repair plan straightforward - I'll be focused on the hydraulic cylinder and piston. Many thanks!

Lmichael thank you for your response. My shop/service manual suggests that in addition to hydraulic cylinder leakage (cylinder cap O-ring broken, piston O-ring worn or damaged, cylinder itself worn or damaged) the problem might also be caused by a malfunctioning control valve. Is there any way...

I hydraulically lift the mid-mount mower on my Kubota B4200D. But it doesn't stay up. It descends to the ground in 2-3 minutes. It's gotten worse over the last 2-3 years (it used to descend much more slowly) . There's no evidence of hydraulic/transmission fluid leakage, as fluid level is full...