Hitachi EX300-3 EX300LC-3 EX300H-3 EX300LCH-3 Main Pump 9122780 9136850 High-Pressure Excavator Hydraulic Pump

Hitachi EX300-3 EX300LC-3 EX300H-3 EX300LCH-3 main Pump 9122780 9136850 High-Pressure Excavator Hydraulic Pump

Hydraulic oil's importance to pumps equals blood's to the human heart. Improper or contaminated oil causes most hydraulic pump failures. Consider these factors when selecting hydraulic oil:

• Viscosity grade: Choose appropriate viscosity (e.g., ISO VG 46) based on ambient temperature. Excessive viscosity increases startup resistance; insufficient viscosity impairs lubrication.

• Oil quality: Select oil meeting manufacturer specifications; avoid cheap, low-quality alternatives.

• Cleanliness: Hydraulic systems demand extremely clean oil—even new oil requires filtration before use.

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• Proper maintenance significantly extends hydraulic pump service life:

• Regularly check oil levels: Maintain proper tank levels; low levels can cause pump cavitation damage.

• Monitor oil temperature: Ideal operating temperature ranges between 40-60°C; higher temperatures accelerate oil degradation.

• Listen for abnormal noises: Unusual sounds often signal impending failure, requiring prompt inspection.

• Replace filters regularly: Change hydraulic oil filters per manufacturer recommendations to maintain oil cleanliness.

• Inspect seals: Address external leaks immediately to prevent air entering the system.

List of spare parts

GZ Yuexiang Engineering Machinery Co., Ltd.

GZ Yuexiang Engineering Machinery Co., Ltd, is a foreign trade company integrating development, sales, procurement, warehousing, transportation and service. Founded in September 2013, we have more than twelve years of experience in machinery trade.

Our main products are Excavator Hydraulic Spare Parts, Hydraulic Main Pump, Swing Motor, Travel Motor, Final Drive Ass'y, Swing Device Ass'y, Swing Gearbox, Travel Gearbox, Gears, Regulators, Relief Valve, Fan Motor and other hydraulic items with genuine and aftermarket quality. Until now, our products have been exported to more than 198 countries and regions, spreading all over the Middle East, Southeast Asia, Africa, North America, South America, Europe and Oceania with our own brand "Belparts", which is highly praised by foreign customers and enjoys a high reputation.

In the future, to practice our company culture “DO BETTER FOR TOMORROW ”, we will strive to learn more professional knowledge about machinery parts and increase our procurement and sales experience to provide customers with better products and services! What’s more, we will devote to develop a more broad business space together base on long-term, friendly, mutually beneficial and win-win business relations.