Hyundai R140W-7 R170W-7 Wheeled Excavator Main Control Valve 31N4-15120 31N4-15130 High Quality Control Valve

This high-precision multi way control valve assembly (main distribution valve/hydraulic valve) has a modern original core part number of 31N4-15120 and is perfectly compatible with replacement part number 31N4-15130. This assembly serves as the absolute center for precise distribution of high-pressure fluid power, multi action composite logic, and walking/steering control of the entire machine. It is specially designed for Hyundai's wheel hydraulic excavators, and is accurately matched with core flagship wheel excavator models such as R140W-7 and R170W-7, ranging from 14 to 17 tons. The product is based on first principles optimization of braking and bi-directional sliding valve response specific to wheel conditions, ensuring absolute control certainty under frequent municipal transitions and excavation composite actions. The physical dimensions of the product packaging are approximately 610mm × 380mm × 410mm, with an overall net weight of approximately 95kg.

"Extreme error prevention and dust-free (core pit avoidance): The lifting environment needs to be treated with dust removal. The wheel excavator main valve integrates the upper turning and working devices with the lower walking steering pipeline, which is extremely complex in distribution. When disassembling, each guide pipe and large oil pipe must be hard marked, and it is strictly prohibited to connect them in a misaligned manner to prevent logical disorder in steering or driving actions.

Symmetrical tightening with torque: The installation bolts of the valve body and the flange of the high-pressure oil pipe must be tightened in multiple stages and symmetrically in accordance with the original torque standard using a torque wrench to prevent slight deformation of the cast iron valve body and blockage of the valve core due to excessive unilateral stress.

Low pressure full stroke exhaust: After installation, the engine must be kept idling for 15-20 minutes for the first ignition. Subsequently, control the working device and walking mechanism to perform several slow and full stroke reciprocating actions, confirm that there are no bubble noises, and the system thermodynamic state is stable before gradually applying normal operating loads."