LVP370 Excavator Hitachi EX1800 EX3500 Main Hydraulic Piston Pump Assembly Part No 4312387 4303630 4274549 4209358 4264706

The LVP370 main hydraulic piston pump assembly is engineered for Hitachi EX1800 and EX3500 excavators, delivering reliable hydraulic performance for demanding mining and heavy construction applications. This swashplate variable displacement pump provides constant power control under varying loads, ensuring efficient operation and extended service life.

• 4312387
• 4303630
• 4274549
• 4209358
• 4264706

The pump features a swashplate variable piston design. The regulator adjusts the swashplate angle and pump displacement under load to achieve constant power control, while built-in pressure and flow overload protection safeguards the system during demanding duty cycles.

• Cylinder block
• Pistons
• Slippers
• Valve plate
• Retainer plate
• Ball hinge
• Power regulator
• Housing
• Drive shaft

1. Verify compatibility first. Confirm the part number and machine model before ordering to ensure correct fitment.
2. Choose the right grade for your application. For heavy mining work, genuine or high-quality remanufactured pumps are recommended. Premium aftermarket options are available for budget-conscious buyers.
3. Consider a repair kit. If the housing and drive shaft are undamaged, restoring the pump with new pistons, cylinder block, valve plate, and seal kit can significantly reduce cost.
4. Maintain oil cleanliness. This pump demands high oil cleanliness. Replace hydraulic oil and filters after installation to prevent premature wear.
5. Inspect on arrival. Check the housing, seals, and free rotation of the drive shaft immediately upon delivery.