Replacing the rotary motor cannot be ordered solely based on the excavator's tonnage.Different models of the same tonnage have different motor displacements,brake structures,valve group set pressures,oil port positions,output splines,and installation flange sizes,and their appearances are similar but cannot be directly interchanged.Incorrect selection,resulting in weak rotation,slipping,abnormal noise,pressure build-up,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 motor housing.The part number is the first authoritative basis for selection.The old part label is worn and needs to be checked:motor displacement,output spline Tooth number modulus;Specification and orientation of motor inlet and outlet threads;Installation hole position of motor flange;Structure of brake valve group;Distinguish between buying a single motor head or a complete set with a gearbox assembly.

　　Distinguish between a motor head without a gearbox and a complete rotary assembly,and the two should not be confused.Some models have rotary overflow valves and buffer valves integrated into the motor,and the valve group must be set to match the original vehicle pressure.Improper pressure can directly cause weak rotation or excessive impact.Pay attention to the braking structure,and the specifications of the wet brake piston and friction plate must be matched.Online,bulk procurement,multi angle shooting of old parts:flange end face,oil port layout,valve group,output spline.

　　Select the quality level based on the operating conditions.Ordinary earthwork construction sites should use regular high-quality sub factories or regular remanufactured assemblies;For long-term heavy load and high-frequency rotation conditions in mines,priority should be given to the original factory assembly.Resolutely reject low-priced simple refurbished parts.The refurbished parts do not replace the plunger distribution plate friction pair,only replace the oil seal shell and spray paint.In a short period of time after installation,there may be internal leakage and slope sliding faults.

　　The rotary motor is a key hydraulic component for walking and rotating,and the selection cannot be made hastily.Placing an order based solely on appearance is for repairing high-frequency potholes.The part number,displacement,spline,oil port,and valve group pressure must all match in order to achieve the designed torque and speed during rotation.The brake locking is reliable and avoids rework and repair.