Replacing the Hydraulic Pump cannot be ordered solely based on the excavator's tonnage.Different models of the same tonnage have different pump displacements,regulator models,power curves,drive splines,oil port positions,installation flanges,and servo control methods.They have similar appearances and cannot be directly interchanged.Incorrect selection may result in car holding,weak movement,incorrect flow,and installation interference.Prioritize checking the OE part number before comparing the multi-dimensional key parameters of the actual product.

　　Firstly,confirm the overall model of the excavator and read the original part number engraved on the old pump casing.The part number is the most authoritative basis for selection.The old part label is worn and needs to be checked:single pump or dual pump assembly;pump delivery;Drive shaft spline Tooth number modulus;Regulator model and power regulation curve;Specification and orientation of threads for inlet,outlet,and drain ports;Install flange holes;Is there a PTO drive interface(used to drive the Pilot Pump/Fan Pump).

　　Distinguish between ordinary negative flow control,positive flow control,and load sensitive control.The control form must match the original vehicle and cannot be mixed.The regulator is the brain of the hydraulic pump,and when the same pump is paired with different regulators,the overall performance of the machine is completely different.Online bulk procurement,taking photos of old pump assemblies from multiple angles,including regulators,oil port layout,and drive end.

　　Distinguish between brand new original factory,legitimate remanufacturing,and simple refurbishment.Ordinary earthwork construction sites should use regular high-quality sub factories or regular remanufactured pumps;Long term heavy load high-frequency operations in mines prioritize original factory assemblies.We firmly refuse low-priced simple refurbished pumps.Simple refurbished pumps only clean the outer shell and replace the external oil seal,and do not repair the plunger distribution plate.They may experience internal leakage,lack of energy,and suffocation during a short period of installation.

　　Hydraulic pumps are the core power components of the entire machine,and their selection cannot be compromised.Placing an order based solely on appearance is for repairing high-frequency potholes.Only when the part number,displacement,drive,regulator power curve,and oil port are all matched,can the hydraulic pump output the design flow pressure,coordinate the overall operation,avoid stalling,and avoid rework and repair.