Komatsu 723-56-12103 Main Hydraulic Control Valve

This high-precision multi way control valve assembly (main distribution valve/distributor) has core original part numbers and iterative cross index numbers including: 723-56-12103, 723-56-12102, 723-56-12101, and 723-56-12100. This assembly serves as the core center for fluid power distribution and logic control of the entire machine, specially designed for Komatsu's small and medium-sized classic excavators, perfectly matching the 12 ton main core models such as PC120-6 and PC120-7. The product is based on first principles for precise design of internal slide valve flow channels, fully bearing the high-pressure flow impact under composite actions, ensuring absolute control certainty. The physical dimensions of the product packaging are approximately 580mm × 410mm × 440mm, with an overall net weight of approximately 95kg. The original factory standard position is connected.

"Extreme error prevention and dust-free (core pit avoidance): The unpacking and installation environment needs to be treated with noise reduction and dust removal. Before connecting the pipeline, all joints must be thoroughly cleaned. The main valve pipeline is intricate and complex. When disassembling, each conduit and main oil pipe must be rigidly numbered, and it is strictly prohibited to connect them in a staggered manner to prevent logical disorder.

Symmetrical tightening with torque: The installation bolts of the valve body and high-pressure flange bolts must be tightened in stages and symmetrically with torque wrenches strictly according to the original factory's specified torque, to prevent slight deformation of the valve body and blockage of the valve core caused by uneven local stress.

Low pressure full stroke exhaust: After installation, the engine must be kept idling for 15 minutes for the first ignition. Subsequently, control the working device to perform several full stroke slow reciprocating movements, thoroughly exhaust the circuit air, and gradually apply the load only after the thermodynamic state is stable."