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.

John Deere 425 Hydraulic Steering Pump Part  AM134437
John Deere 425 Hydraulic Steering Pump Part AM134437
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Jacobsen Turfcat 628d Mower Diesel deck 4 wheel drive hydraulic pump 2721334
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PUMP SHAFT KIT 15MM KEYWAY HYDRO GEAR HYDRAULIC PUMPS  TRANSAXLES
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PUMP CHARGE KIT 2510071 HYDRO GEAR OEM HIGH OUT PUT HYDRAULIC PUMPS
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FAN BLADE 7 INCH 10 FIN 51862 2EA HYDRO GEAR hydraulic pumps  transaxles
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BYPASS VALVE KIT 2513030 2EA HYDRO GEAR hydraulic pumps  transaxles
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PUMP PG 1GEF DY1X XXXX BDP 10A 450 HYDRO GEAR HYDRAULIC PUMPS  TRANSAXLES
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FAN KIT 6 INCH 52014 10FIN CW HYDRO GEAR OEM hydraulic pumps  transaxles
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OVERHAUL KIT 2513013 HYDRO GEAR OEM BDU 10 hydraulic pumps  transaxles
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PUMP SHAFT KIT 70763 HYDRO GEAR HYDRAULIC PUMPS  TRANSAXLES
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FAN KIT 72137 HYDRO GEAR OEM PULLEY STYLE hydraulic pumps  transaxles
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PUMP PG 1HQQ DA1X XXXX BDP 10A 456 HYDRO GEAR HYDRAULIC PUMPS  TRANSAXLES 10CC
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PUMP TRANSAXLE 717 3455 917 3455 HYDRO GEAR BDR 303 HYDRAULIC PUMPS
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PUMP CHARGE KIT 2513027 HYDRO GEAR HYDRAULIC PUMPS  TRANSAXLES
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BLOCK 71971 HYDRO GEAR OEM 12CC hydraulic pumps  transaxles
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CHARGE RELIEF KIT 70403 2 EA HYDRO GEAR OEM hydraulic pumps  transaxles
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PUMP ZL KMEE 3BLC 2MXX 415464 HYDRO GEAR HYDRAULIC PUMPS  TRANSAXLES
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FILTER KIT AUXILLARY 2510090 2 EA HYDRO GEAR OEM hydraulic pumps
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BRAKE ARM 1EA LH AND RH 71069 71070 HYDRO GEAR hydraulic pumps  transa
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PUMP PG 1GQQ DYZX XXXX BDP 10A 408 HYDRO GEAR HYDRAULIC PUMPS  TRANSAXLES
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