5740598 Hydraulic Main Pump for CAT 390F 374F

This pure original high-precision heavy-duty hydraulic main pump assembly has a core original part number of 574-0598 (5740598). As the absolute core of high-pressure fluid power for the entire machine, this assembly is specially customized for Caterpillar's new generation of heavy-duty hydraulic excavators, seamlessly matching 50 ton core mining and heavy-duty rock flagship models such as CAT 349, 352, and 355. The product is based on first principles for integrated optimization of ultra-high pressure fluid mechanics and full power electronic control logic, perfectly carrying continuous high flow alternating loads under extremely harsh mining conditions, ensuring absolute certainty of power output. The physical dimensions of the product packaging are approximately 740mm × 420mm × 450mm, with an overall net weight of approximately 165kg. The original factory standard position is precisely aligned.

"Extreme cleaning and torque tightening: Before using heavy-duty lifting equipment for docking, the unsealed environment needs to be treated with dust removal. All high-pressure oil pipes and feedback signal pipes must be thoroughly cleaned before connecting to a new pump. Tightening bolts must be done using a torque wrench strictly in accordance with the original factory torque standard for symmetrical and phased cross tightening, to prevent slight stress deformation of the shell caused by uneven local stress.

Forced oil filling (core pit avoidance): After the main pump is lifted in place and the pipeline connection is completed, clean hydraulic oil must be filled from the top oil injection/exhaust port of the main pump before starting the engine. 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 and thermodynamic adaptation of the entire system. After the oil temperature and pressure stabilize and all bubbles are completely expelled, normal operating loads can be gradually applied."