8973627472 Crankshaft Pulley for Isuzu 4HK1 Engine Hitachi Excavator Parts

Part number 8973627472 (also known as 8-97362747-2) is an original crankshaft pulley specifically designed for Isuzu 4HK1 series diesel engines. This engine is widely used in multiple Hitachi ZX series hydraulic excavators. According to publicly available accessory information, the main compatible models include Hitachi ZX200-3, ZX210-3, ZX240-3, ZX250-3, ZX270-3, etc. In addition, the engine may also be applied to larger tonnage Hitachi excavators such as ZX330 and ZX450. This part is an original factory part, and its common part number is 8973627472 or 8-97362747-2. It must be verified based on this during procurement.
 

The crankshaft pulley is the core transmission component of the engine front-end accessory drive system. Its core function is to synchronously transmit the power of the crankshaft to accessories such as the water pump, generator, air conditioning compressor, and power steering pump through a Poly-V belt, ensuring the normal operation of the engine cooling system, charging system, and auxiliary system. As an original component, it is usually made of high-strength alloy steel or ductile iron precision forging or casting, and undergoes strict dynamic balance testing to eliminate unbalance during high-speed rotation, reduce engine vibration and bearing wear. The weight of this component is approximately 8.84 kilograms, and its structure is sturdy. The inner hole is equipped with a keyway or spline that matches the front end of the crankshaft, and is securely connected to the crankshaft through a central large bolt.

The maintenance core of the crankshaft pulley lies in regularly checking its condition, ensuring installation tightness, and synchronously inspecting the drive belt system. It is recommended to check every 500 working hours or every quarter, with a focus on checking the tightening torque of the fixing bolts. A torque wrench must be used to re tighten according to the original factory specified torque value (usually higher, refer to the maintenance manual) to prevent loosening. Installation and replacement: When disassembling the old pulley, a specialized pulling tool must be used and knocking is strictly prohibited to avoid damaging the threads or bearings at the front end of the crankshaft. Before installing a new pulley, it is necessary to clean the front end of the crankshaft and the inner hole of the pulley to ensure that there are no oil stains or burrs.