AP2D12LV3RS7-950-0 Bobcat425 HYDRAULIC MAIN PUMP ASSEMBLY For Crawler Excavator Parts

Excavator AP2D12LV3RS7-950-0 Bobcat425 HYDRAULIC MAIN PUMP ASSEMBLY for crawler excavator parts

Axial Piston Pump (Bent-Axis Design - Fixed & Variable Displacement):
While less common than swashplate types in modern excavators for main circuits, the bent-axis axial piston pump offers distinct advantages, particularly in high-speed applications or auxiliary functions. Its principle also relies on pistons reciprocating within a rotating cylinder block, but the reciprocation is achieved by bending the axis of the drive shaft relative to the axis of the cylinder block. The pistons are connected to the drive shaft via ball-and-socket joints. As the drive shaft rotates, the angular offset forces the pistons to move in and out of their cylinder bores as the distance between the drive flange and cylinder block face changes cyclically. This reciprocation performs the suction and discharge functions against a stationary port plate, similar to the swashplate design. Structurally, it comprises the drive shaft with a flange, the cylinder block, pistons with connecting rods/balls, a stationary port plate, and a housing incorporating the angle-setting mechanism. For variable displacement versions, the angle of bend between the drive shaft and cylinder block is adjusted (often hydraulically), changing the piston stroke and hence displacement. Fixed displacement versions have a rigidly fixed angle. Bent-axis pumps are renowned for very high mechanical efficiency, smooth operation, and tolerance to high speeds and pressures.