Hydraulic Pump

how efficient is a hydraulic pump and hydraulic motor?

how efficient is hydraulic motor connceted to a hydraulic pump so the pump runs the motor. what kind of losses are there? is there a different lose at different speeds

If the components are new, the circuit will be relatively efficient. Inefficiency will be a function of leakage in the pump and motor.
The losses will go up with speed and load. The suppliers normally provide a graph that enables you to work out what the delivered power will be at a given load and speed setting.

Just a quick note about the above answer, liquids are compressible but at low pressures the compression is so low it can be virtually ignored. However in applications like fuel systems, operating at around 2000 bar, diesel is compressed to be 85% of its original volume.

Case 220 Lawn tractor Hydraulic oil pump rubber hoses 3pc set GOOD SHAPE C29697
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Toro Greensmaster 3000 Hydraulic Pump Greens Mower III IV
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John Deere F710 F725 Front Mount Hydraulic Power Steering Valve Pump NICE
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Case Ingersoll Tractor Lawn Mower 222 Kohler Engine Hydraulic Oil Pump Mount
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Gravely Garden Tractor Lawn Mower 8163 B Hydraulic Oil Pump Assembly
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Case Ingersoll Garden Tractor Lawn Mower 446 Hydraulic Oil Hose Pump to Valve
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