4705608 Original Excavator Shaft for ZX33U-5A ZX38U-5A ZX120-5A ZX130-5B 

Part number 4705608 is a specialized part number for Hitachi original excavator shafts. This shaft is a key transmission component in the excavator's slewing, walking, or working device transmission system, responsible for transmitting torque and bearing complex loads. According to the general information of Hitachi excavator accessories, it may be compatible with Hitachi ZX series (ZAXIS) hydraulic excavators. Common models may include ZX200, ZX210, ZX240, ZX250, ZX330, ZX350, ZX450, etc. The specific application areas may involve rotary vertical shafts, walking motor output shafts, or working device transmission shafts. The original part number is 4705608, which must be used as the reference for verification during procurement.
 

This shaft is the core load-bearing component of excavator power transmission, and its core function is to efficiently and reliably transmit the rotational power of the engine or hydraulic motor to the actuator (such as the rotary platform, walking mechanism or working device), and withstand huge torsional, bending and impact loads. As an original component, it is usually made of high-quality alloy structural steel (such as 40Cr, 42CrMo or similar materials) precision forged, and undergoes quenching and tempering treatment (quenching+high-temperature tempering) to obtain excellent comprehensive mechanical properties, with high tensile strength (≥ 800MPa), high fatigue limit and good toughness. The shaft body undergoes precision turning, grinding, and heat treatment to ensure dimensional accuracy (usually IT6-IT7 levels), form and position tolerances, and surface hardness.
 

The maintenance core of this shaft lies in regular inspection, correct lubrication, and standardized disassembly and assembly. Every 500 working hours or every month, a dial gauge should be used to check the radial and axial runout of the shaft, ensuring that they are within the allowable range (usually radial runout ≤ 0.05mm). Lubrication guarantee: For shafts equipped with lubrication points (such as flower key shafts), it is necessary to add the specified type of extreme pressure lithium based grease through the oil nozzle every 8 to 50 working hours. For shafts that rely on gear oil splash lubrication, it is necessary to regularly check the gear oil level and quality.