4404102 Original Excavator Pump Pin for Hitachi ZX110

Part number 4404102 is the original hydraulic pump pin shaft provided by Hitachi for the ZX110 series small hydraulic excavator. This component is mainly used inside hydraulic pumps as a precision shaft pin to connect moving components such as plungers, sliding shoes, or inclined plates. Its universal models usually cover 10-13 ton small models on the same platform, such as ZX110-3, ZX110-5G, ZX130, etc. As the original core motion pair connector, its diameter, length, ring groove position, and heat treatment process are precisely matched with the pump hole position. It is strictly prohibited to use universal pin shafts that do not match the size or hardness to replace them, in order to avoid abnormal wear, noise, or pressure failure inside the pump.

This product is a stepped shaft pin made of high-strength alloy steel precision machining, with a silver gray overall color and a surface that has undergone fine grinding and rust prevention treatment. There is a raised circular structure in the middle design, with a circular through-hole machined on the ring. This design is mainly used for installing positioning pins, spring pins, or as a lubricating oil passage, which is a key feature to prevent axial movement and ensure lubrication. The two ends of the pin shaft are precision ground cylindrical surfaces, which have a transition or interference fit with the internal components of the pump. Its material and heat treatment ensure high shear strength and wear resistance, which is the core component to ensure the stable operation of hydraulic pumps under high pressure and high frequency.

Installation specifications: 1 Cleaning inspection: Before installation, the pin shaft itself and all mounting holes inside the pump must be thoroughly cleaned with precision cleaning agent to ensure that there are no burrs or metal shavings. Check that the surface of the new pin shaft is free of scratches and rust. 2. Alignment installation: Align the pin shaft with the installation hole inside the pump, and be sure to use a special installation sleeve or copper rod to press it smoothly and vertically along the axis or gently tap it into place. It is strictly prohibited to directly hammer the surface of the pin shaft or apply improper force that may cause bending. 3. Positioning and fixation: Ensure that the through-hole on the middle ring is aligned with the corresponding hole on the pump body, and install a brand new spring pin or positioning pin to achieve final locking and prevent rotation or axial movement during operation.