A LOOK AT THE INTERNAL PARTS OF A 2 STAGE or "HIGH LOW" GEAR PUMP TYPICAL OF A 20 TON OR 22 TON LOG SPLITTER. THE UNLOADING VALVE GIVES THE COMPROMISE WE NEED TO HAVE A LOT OF FLOW A LOT OF PRESSURE WITH A LOW HP ENGINE. 0:00 to 9:41 : explanation, 9:42 order of parts at assembly
PART TWO NOW UP ... ADJUSTING UNLOADING VALVE: https://youtu.be/tx2DDslCgAM