What’s the difference between a single-speed and a two-speed hydraulic hand pump?

[@ahmadmatonding4519]

Thank you so much for this video. Upload more.

[@ariesariz9574]

single acting spring return hydraulic cylinder.. but the manual pump is double acting. please help me, guide to Make it single pump

[@musicbyzain9022]

Consider there are two cylinders pointing in opposite direction...at one cylinder weight load is very high..and on the other one there is no weight at all..so can there be a way to compress them back at same time...because the one containing weight will definitely try to come back fastly...and the cylinders we are using are single sided spring type cylinders...