The last few days have been wood splittin' season.The pump on the
splitter is two stage, when it hits a tuff spot it down shifts and
moves half speed with double power. ON a tuff one just an hour ago we
heard a loud click and instead of down shifting there was no pressure
at all. Pounded that piece of wood off with a BFH and it worked
normal. That is until the next piece that kicked it down - a loud
click and then no pressure at all.

I know nothing about these pumps. What's the likely failure here?

Karl