Piston Pump Group(Mounting Pump Group) 3722778 372-2778 4876215 487-6215

Piston Pump Group (Mounting Pump Group) 3722778 372-2778 4876215 487-6215c

As the core power component of the hydraulic system, the excavator's plunger pump unit bears the critical task of providing high-pressure oil to the travel motor, swing motor, and cylinders. The main pump (plunger pump) utilizes an axial piston design, driving multiple plungers through a swash plate or inclined shaft to reciprocate, achieving fuel pressurization (and flow control), and outputting high-pressure oil to drive the actuators. The pilot pump (gear pump) is integrated into the pump unit, providing low-pressure oil (approximately 25 MPa) to the distribution valve, controlling the main valve's operation. Pump units for large and medium-sized excavators often utilize an integrated "plunger main pump + gear pilot pump" structure.