Komatsu 709-1A-11300 Main Hydraulic Control Valve

"This mining grade ultra large flow multi way control valve assembly (main distribution valve) has core original part numbers including 709-1A-11300, 709-1A-11400, and 709-1A-11100. This assembly serves as the core center for the distribution and logic control of ultra-high pressure and high flow fluid power in the entire machine, specially designed for the Komatsu ultra large mining excavator, perfectly matching the PC2000-8 hundred ton core main model. The product is designed with high precision for ultra heavy load flow channels based on first principles, fully bearing the severe composite loads under extreme mining conditions, ensuring absolute control certainty. The physical dimensions of the packaging are approximately 1120mm × 780mm × 850mm, with an overall net weight of approximately 680kg. The original factory standard position is connected.
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"Heavy load error prevention and extreme cleaning (core pit avoidance): Before using heavy-duty lifting equipment for docking, the assembly surface needs to be treated with noise reduction and dust removal. The pipeline of the hundred ton main valve is extremely complex. When disassembling, each conduit and main high-pressure pipe must be rigidly labeled and numbered. It is strictly prohibited to connect them in a staggered manner, otherwise it will cause system logic disorder and breakdown of components.

Symmetrical tightening with hydraulic wrench: The installation bolts of the valve body and the ultra-high pressure flange bolts must be tightened in multiple stages and symmetrically with hydraulic or high torque wrenches strictly according to the original factory standard torque, to prevent uneven stress from causing slight deformation of the cast iron valve body and blockage of the valve core.

Full range idle exhaust: After adding clean hydraulic oil, the first ignition must run at idle low pressure for 20-30 minutes. Subsequently, control the working device to perform several full stroke, slow reciprocating movements, thoroughly exhaust the huge amount of air in the circuit, and confirm the thermodynamic stability before gradually putting it into mining operations."