In order to increase the load capacity of construction machinery, hydraulic motors, direct way is to increase its hydraulic system pressure, flow and power. Currently, advanced engineering machinery products rated international pressure, mostly in more than 30 MPa, and with advances in materials science and technology, there are toward the higher pressure even using high pressure hydraulic technology trends in the direction of development; flow rate per minute is usually Hundreds of liters; power over hundreds of kilowatts. Such as Germany Orensttein && Koppe made the world's first largest RH400 full hydraulic excavators, hydraulic motor repair, bucket capacity of 42 m3, hydraulic oil source for the variable displacement axial piston pump 18, the hydraulic motor maintenance, total flow rates up to 10 200 L / min; the original motivation for the two QSK60 diesel engine, hydraulic motor parts, with a total power of up to 2 014 kW. The power loss of power losses in power and efficiency (1) hydraulic pump hydraulic pump have volume loss and mechanical loss of two parts: l) Volume loss volume loss means the loss of the flow of the hydraulic pump, the actual output flow rate of the hydraulic pump is always less than the theoretical flow, mainly due to the leak, the oil inside the compression pump high-pressure chamber and the suction in the suction process due to too much resistance, oil viscosity and pump speed reasons which led to higher oil not all full sealing working chamber. Volume loss of the hydraulic pump volumetric efficiency, which is equal hydraulic flow ratio of actual output to its theoretical flow q qt, namely the actual pump output flow q is a hydraulic motor of choice _ _ Jing Chong hydraulic hydraulic motor installed by Jinan crystal Chong Hydraulic Machinery Limited. Hydraulic motor of choice _ _ Jing Chong hydraulic installation hydraulic motor Jinan Jing Chong Hydraulic Machinery Co. (www.jnjcyy.com) (www.jnjcyy.com) this year introduced a new upgrade, the above picture is for reference only, please dial this page Phone or pictures on obtain the latest information, contact: Cui.