2055487 Original Loader Pinion Gear for ZW250-6

Part number 2055487 is an original gear from Hitachi Construction Machinery. A support chain (chain rail link) system used for tracked equipment. Therefore, this' small gear 'is actually the driving sprocket or tensioning gear ring that supports the chain assembly. Its universal models mainly cover Hitachi ZX series crawler excavators (such as ZX200, ZX330, etc.).

This product is a drive sprocket ring gear, with a star shaped main body and multiple protruding arms with tooth grooves evenly distributed around the periphery. These tooth grooves are used to precisely mesh with the chain plate of the track link to drive or guide the track. The gear center is a precision machined through-hole used for installing bearings or connecting splines/key slots with shafts. The material is high-strength alloy steel, which has undergone heat treatment such as carburizing and quenching, giving the tooth surface extremely high hardness (usually HRC 58-62) to withstand the huge impact and wear caused by continuous meshing with the track links. The silver gray part of the gear surface in the picture is the base material, and the dark area at the bottom of the tooth groove may be heat treatment marks or slight wear from use. Its core function is to achieve power transmission or chain guidance in the track walking system, and to withstand the weight of the entire machine and the impact load during operation.

Installation specifications: 1 Cleaning and inspection: Before installation, the installation shaft and gear inner holes must be thoroughly cleaned, and the tooth surface must be checked for any transportation scratches. 2. Alignment installation: This gear needs to be assembled with bearings, seals, and other components before installation. During installation, it is necessary to ensure that it is absolutely aligned with the drive shaft or tensioner shaft, and the maximum coaxiality error should be ≤ 0.1mm. 3. Torque tightening: Use a torque wrench to tighten all fixing bolts according to the specified torque (usually 200-400 N · m level) and sequence.