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The product is a special designed pump for the grouting in the coal well.The hydraulic system of the head is the assembly one,which is very convenient for disassembly and maintenance.The dynamic power of the pump is a ball bearing transmission(between the lever and crank shaft)with spraying lubrication.It can keep 24hours running without necessary of cooling system.The dynamic power other pump is a ball bearing transmission. Description of the products Diameter of the piston(mm) 50556065707580enginepositionM3/hMpaM3/hMpaM3/hMpaM3/hMpaM3/hMpaM3/hMpaM3/hMpa55KWI5366307258.4219.718111612.714II4.3415.3346.3287.4248.5219.81811.216III3.9464.8385.7316.6277.7238.9201018IV3.4524.2435365.8306.8267.8238.92075KWI5496417348.4299.725112212.719II4.3565.3466.3397.4338.5289.82511.222III3.9624.8515.7436.6377.7318.9271024IV3.4714.2595495.8426.8367.8318.92790KWI5596497418.4359.730112612.723II5.3566.3477.4408.5349.83011.226