Sumitomo SH200 SH210 Case CX210 Excavator Swing Motor KRC11931 Device High Quality Swing Assembly

This high-precision heavy-duty Swing Motor Assembly has a core original part number of KRC11931. As the absolute fluid power center for 360 ° rotation and high-frequency precise braking of the upper body, this assembly is specially designed for Sumitomo and Case hydraulic excavators on the same platform, perfectly matching Sumitomo SH200, SH210 (including A3/A5 series), Case CX210, CX210B and other 20 to 21 ton industry flagship models. The product is based on first principles for optimizing the shear resistance of high-pressure inclined plate plungers, perfectly bearing the shear stress caused by frequent directional changes with high inertia, ensuring absolute certainty of output torque. The physical dimensions of the product packaging are approximately 490mm × 390mm × 410mm, and the overall net weight is about 65kg. The original factory standard position is precisely docked.

"Extreme cleaning and torque tightening: Before installation, the mating surface of the rotary reducer must be thoroughly cleaned to ensure precise and stress free engagement of the output gear shaft. 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 avoid local stress concentration causing end face deformation.

Forced oil injection (core avoidance pit): Do not connect the high-pressure oil pipe to the wrong drain pipe (Case Drain). Before starting the engine, it is necessary to fill the top of the swing motor housing with clean hydraulic oil through the bleed/fill port. It is strictly prohibited to start dry grinding, otherwise the internal plunger and distribution plate will undergo irreversible physical erosion within 3 seconds of ignition.

No load micro exhaust transition: After the first ignition, 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 air inside the circuit, and confirm that the thermodynamic state is stable before gradually applying the full working load."