High Performance Hydraulic Main Pump 9153026 9151416 9159230 9158018 Stable Power Supply Parts for EX120-5 EX130H-5 Excavator

This high-performance and high-precision hydraulic main pump assembly has Hitachi original core part numbers 9153026 and 9151416, and is perfectly compatible with replacement codes 9159230 and 9158018. The components of each generation have perfect interchangeability. As the absolute heart of high-pressure fluid power for the entire machine, this assembly is specially designed for Hitachi's small and medium-sized hydraulic excavators, accurately matching the core core models of the 12 to 13 ton industry, such as EX120-5 and EX130H-5, which are the golden generation star models. The product is based on first principles optimization of the inclined plate plunger structure and high dynamic load response, seamlessly carrying the flow load under the combined action of earthwork and municipal engineering, ensuring absolute certainty of stable power supply. The physical dimensions of the product packaging are approximately 590mm × 330mm × 350mm, with an overall net weight of approximately 82kg. The original factory standard position is precisely aligned.

"Extreme cleaning and torque tightening: Before lifting and docking, the installation surface of the engine flywheel housing and the transmission spline must be kept absolutely clean. All high-strength fastening bolts must be tightened using torque wrenches, strictly following the original factory torque standards for symmetrical and phased cross tightening, to prevent local abnormal shear stress from causing slight stress deformation of the shell.

Forced oil injection (core pit avoidance): After the main pump is lifted into place and the pipeline connection is completed, clean hydraulic oil must be filled from the top oil injection/exhaust port of the main pump and manually turned before starting the engine for the first time. It is strictly prohibited to start dry grinding, otherwise the internal rotating components will undergo irreversible physical erosion within 3 seconds of ignition.

Low pressure transition and full exhaust: After the first ignition, the engine must be kept idling and running at low pressure for 10-15 minutes for automatic exhaust of the entire system. The working device should be controlled to perform slow and full stroke reciprocating actions. After confirming that there are no bubbles and the pressure is stable, normal operating loads can be gradually applied."