Hyundai HX300L Excavator Swing Motor Swing Device 38K8-10150 38K8-11100 High Quality for Earthmoving

This high-precision heavy-duty Swing Motor/Swing Device has a Hyundai original core part number of 38K8-10150 and is perfectly compatible with replacement part number 38K8-11100. This assembly serves as the core heart of fluid power drive and precise rotation on the vehicle body, specifically designed for deep matching in the aftermarket of Hyundai's high standard large excavators. It accurately matches 30 ton industry core main large earthmoving star models such as the Hyundai HX300L. The product is based on first principles optimization of ultra-high pressure rotary plunger components and pilot buffer control valves, seamlessly bearing the alternating shear stress caused by frequent opening and braking due to large inertia in earthwork excavation, ensuring absolute certainty of rotational stability performance. The physical dimensions of the product packaging are approximately 540mm × 510mm × 680mm, with an overall net weight of approximately 115kg.

"Extreme cleaning and torque tightening: Before lifting and docking, the input end face and gear spline of the rotary reducer must be absolutely clean and free of any foreign objects or rust. All high-strength fastening bolts must be tightened using torque wrenches, strictly following the factory's specified torque for symmetrical and phased cross tightening to prevent local abnormal shear stress.

Forced oil filling of motor housing (core avoidance pit): When connecting hydraulic pipelines, they must be absolutely aligned and do not connect the wrong drain pipe (Case Drain). Before starting the engine for the first time, clean and pure hydraulic oil must be filled from the bleed/fill port on the top of the rotary motor. It is strictly prohibited to start dry grinding, otherwise the internal rotating components will undergo irreversible physical erosion within 3 seconds of ignition.

No load micro exhaust transition: After the first start, keep the engine idling and control the upper body to rotate left and right at a small angle and slow speed alternately for 10-15 minutes in a no-load state. Thoroughly exhaust the residual air inside the circuit and confirm that the thermodynamic state of the entire system is stable before gradually applying normal operating loads."