8976030040 Excavator 6HK1 Engine Parts Crankshaft

The part number 8976030040 is the original engine crankshaft provided by ISUZU (Isuzu) for the 6HK1 series diesel engine. This component is the core motion and power output component of the engine, converting the linear reciprocating motion of the piston into rotational motion. Its universal models cover various mainstream brands of medium-sized excavators equipped with 6HK1 engines, mainly including Hitachi ZX200-3, ZX240-3, ZX270-3, EX200-3 and other 20-27 ton models. As the heart component of the original engine, the dimensions, phase angles, balance block configurations, and materials of all shaft necks are precisely matched with the engine cylinder block, connecting rod, and piston group. It is strictly prohibited to use any refurbished or non original crankshafts, otherwise it will lead to increased engine vibration, abnormal wear, and even scrapping.

This product is a high-strength alloy steel fully forged crankshaft. The main journal and connecting rod journal are subjected to high-frequency quenching or nitriding treatment, with a surface hardness of up to HRC 58-62, and undergo ultra precision grinding to present a bright and smooth mirror effect as shown in the picture, ensuring optimal lubrication and wear resistance. The crank arm and balance block undergo precise dynamic balance correction to ensure smooth engine operation. The core dimensions (such as the diameter of the main journal/connecting rod journal, axial length, and the angle between each cylinder crank) are precision machined according to the original factory drawings. There are positioning flanges and key slots at both ends for installing timing gears, pulleys, and flywheels. Its material and process ensure ultra-high fatigue strength and torsional resistance under high speed and high explosive pressure.

Installation specifications: 1 Thoroughly clean: Before installation, all oil passages of the crankshaft must be thoroughly flushed with specialized cleaning agents and high-pressure air to ensure that there are no metal shavings or impurities. 2. Measurement inspection: Use an external micrometer to measure the diameter, roundness, and cylindricity of all shaft necks, and use a V-block and dial gauge to check the radial runout of the main shaft neck (which should be ≤ 0.05mm). 3. Assembly: Apply sufficient assembly oil to the shaft neck and bearing surface in an absolutely clean environment, and use specialized lifting tools to smoothly install the cylinder body with the installed main bearing. 4. Torque tightening: Strictly follow the sequence, frequency, and torque values specified in the maintenance manual (usually tightened in 3 times, with a final torque of 200-300 N · m), and use a calibrated torque wrench to tighten the main bearing cover bolts.