3063840 Excavator Hydraulic Main Pump Transmission Gear for ZX200

Part number 3063840 is the transmission gear of Hitachi's original hydraulic main pump. According to publicly available information on Hitachi hydraulic pump accessories, this part is mainly suitable for Hitachi medium to large hydraulic excavators equipped with specific models of hydraulic main pumps (such as HPV102, HPV118, HPV145 series, etc.). Specifically, it may cover models such as ZX200, ZX240, ZX270, ZX330, ZX360, and other series. The original part number is 3063840, which should be used as the reference for procurement.

The transmission gear is the core component of the hydraulic main pump power transmission, responsible for efficiently and smoothly transmitting the power of the engine flywheel to the main shaft of the hydraulic pump, driving the plunger or gear set to generate high-pressure oil. As an original component, it is usually made of high-strength alloy forged steel (such as 20CrMnTi, SCM415, etc.), which undergoes carburizing quenching or quenching and tempering heat treatment to give the tooth surface extremely high hardness (HRC 58-62) and wear resistance, while the tooth core maintains excellent toughness to withstand impact loads. The gear machining has high precision, with involute tooth profile, and undergoes grinding or honing precision machining to ensure smooth meshing, low noise, and high transmission efficiency.

The maintenance core of this transmission gear lies in ensuring good lubrication, correct installation, and regular condition monitoring. Lubrication inspection: It is necessary to regularly check and replace the specialized lubricating oil for the hydraulic system to maintain the cleanliness and viscosity of the oil within the standard range, as oil contamination is the main cause of abnormal gear wear. Installation specification: When replacing, it is necessary to use special tools for disassembly and assembly to ensure the alignment accuracy between the gear and the shaft, and tighten the fixing bolts according to the torque specified in the maintenance manual.