3575021020 Original Loader Hydraulic Sleeve for Hitachi ZW310-6

Part number 3575021020 is a Hitachi original hydraulic sleeve, which is a key wear-resistant and guiding component at the connection of hydraulic cylinders or pin shafts. According to Hitachi's parts system, this part number corresponds to the original hydraulic cylinder liner, shaft sleeve, or sliding bearing. It is widely compatible with the hydraulic cylinders of the boom, bucket, steering and other parts of multiple wheel loaders in Hitachi ZW series, including common models such as ZW180, ZW250, ZW310, ZW330, etc. The original part number is 3575021020, which should be used as the reference for procurement. Due to differences in the size, fitting tolerance, and installation method of hydraulic cylinders among different models, it is necessary to provide the complete model, serial number, and identification information of the hydraulic cylinder of the loader before replacement for accurate matching.

The hydraulic sleeve is a "wear-resistant armor" and "precision guide rail" at the connection of the hydraulic cylinder or pin shaft. Its core function is to serve as a sliding bearing between the piston rod or pin shaft and the cylinder/connecting hole, bearing huge radial loads and impacts, while reducing friction, preventing direct metal contact wear, and ensuring the centering accuracy and smoothness of moving parts. As an original component, it is usually made of high-strength wear-resistant alloy copper (such as aluminum bronze, tin bronze) or composite materials (such as DU lining), and undergoes precision inner and outer turning, grinding, and surface treatment. Its inner hole has extremely high dimensional accuracy and smoothness, and may be designed with lubricating oil grooves or oil storage holes to achieve self-lubricating. The sleeve has excellent wear resistance, corrosion resistance, compressive strength, and good thermal conductivity, which can effectively disperse heat and prevent biting or jamming caused by friction overheating.

The maintenance core of this hydraulic sleeve lies in regularly checking the wear condition, ensuring sufficient lubrication, and maintaining cleanliness. It is recommended to check the fit clearance between the sleeve and the piston rod/pin shaft every 500 working hours, which can be determined by measuring the radial clearance or observing whether there is eccentric wear or strain. Lubrication management: Strictly follow the maintenance manual requirements and add the specified type of lithium based grease through the lubrication nozzle designed on the hydraulic cylinder to ensure sufficient lubrication. If the sleeve is designed for self-lubricating, it is necessary to regularly clean its surface of dust and grease to prevent hard particles from embedding and accelerating wear.