3072697 Original Excavator Arm Bushing for ZX160 ZX200-3 ZX200-3G ZX240

Part number 3072697 is a specialized part number for Hitachi's original excavator arm bushings. The bushing is the core wear-resistant component of key articulated parts such as excavator boom, arm or connecting rod, installed between the pin shaft and the structural component hole, which plays a role in reducing friction, bearing load and extending the service life of the structural component. According to the general information of Hitachi excavator accessories, it is widely 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 the root of the boom, the connection between the boom and the bucket, and the bucket connecting rod. The original part number is 3072697, which must be used as the reference for verification during procurement.
 

The arm bushing is the core friction pair component of the articulated joint of the excavator working device. Its core function is to form a low friction, high wear resistant sliding interface between the pin shaft and the structural component hole, withstand huge radial loads, impact loads, and alternating stresses, effectively isolate direct contact between metals, and protect the main structures such as the higher priced boom and arm from wear. Its design can withstand extremely high specific pressure (usually up to 50MPa or more) and impact loads, with a wide working temperature range (-30 ℃ to+120 ℃), and has good corrosion and micro motion wear resistance, ensuring long-term reliable operation under frequent and heavy reciprocating swing conditions of excavators.
 

The maintenance core of this arm bushing lies in regular lubrication, monitoring clearances, and timely replacement. Every 500 working hours or every month, the hinge points of the working device should be checked for any abnormal noise, shaking, or heating, and a pry bar should be used to check the radial clearance between the bushing and the pin shaft. If the clearance increases significantly (usually more than 1mm) or abnormal noise occurs, replacement should be considered. Cleaning: Before adding new grease, the grease nipple and surrounding area should be cleaned to prevent mud and sand from being pressed into the lining.