2044922 Original Excavator Air Conditioner Rubber Bushing for ZX120 ZX130 ZX160 ZX180 ZX200 ZX240

Part number 2044922 is the official part number for the rubber lining of Hitachi's original excavator. This component is a key shock-absorbing and wear-resistant element for the various motion hinge points of the excavator, such as the boom, arm, bucket, chassis, and other connecting parts. It is responsible for isolating direct contact between metal components, absorbing impact loads and vibrations during operation through the elastic deformation of rubber, and allowing limited relative rotation to reduce wear and noise between the metal pin shaft and the installation hole. It is an important vulnerable component to ensure the smooth operation of the equipment and extend the service life of structural components. As an original standard component, it is widely compatible with various connection pin shafts of multiple Hitachi excavator models, such as ZX200, ZX220, ZX240, ZX330 and other ZX series, as well as the large and small arms, buckets, connecting rods and other parts of EX series excavators such as EX200, EX220, EX300.

This original rubber liner belongs to the metal rubber composite liner (also known as self-lubricating liner or oil containing liner). Its core function is to provide cushioning and shock absorption through rubber layers while bearing radial loads and alternating stresses, and to achieve long-term lubrication through special design. As an original component, it is usually made by firmly bonding high-quality wear-resistant rubber (such as nitrile rubber NBR or polyurethane PU) with a metal jacket (usually made of steel) through vulcanization process. The internal metal skeleton provides structural support and installation strength, while the external rubber layer provides elasticity and sealing. Some high-end bushings, such as Hitachi HN bushings, also have a "sponge adsorption" function. The lubricating oil stored inside can slowly seep out under pressure, forming an oil film on the friction surface, achieving self-lubricating and greatly extending the service life.

The maintenance core of this rubber bushing lies in regularly checking its wear condition, ensuring sufficient lubrication, and timely replacement. Regular inspection and lubrication: It is recommended to check the bushing for abnormal wear, cracks, rubber layer peeling, or severe deformation every 250 working hours or every week. At the same time, check whether the corresponding pin shaft has excessive wear or scratches. It is necessary to strictly follow the maintenance manual's prescribed cycle (usually every 400-500 hours) and add the specified type of lubricating grease into the liner through the oil nozzle to ensure that the grease can fully enter the internal oil storage structure of the liner. When installing a new liner, it must be aligned with the direction of the oil hole and smoothly pressed in using a special tool or press. It is strictly prohibited to directly hammer the edge of the liner to avoid damage. After installation, sufficient lubricating grease should be added immediately and the working device should be operated several times to ensure even distribution of grease.