· This pump (86590563) is OEM for a range of New Holland skid steer / compact-track loader models: New Holland LS160, New Holland LS170, New Holland L160, New Holland L170, New Holland L175, and New Holland C175.
· It is a hydrostatic (tandem-drive) pump used for the drive system — a critical component.
It is a hydrostatic tandem-drive pump. In other words: this pump is part of the hydrostatic drive system — it provides hydraulic flow that powers the transmission (hydrostatic motors) of the loader, enabling it to drive (move forward/back, steer) using hydraulic power rather than a mechanical gearbox.