The 4220739 / 4220737 Transmission Drive Hydraulic Gear Pump is a heavy-duty, external gear type pump engineered specifically for high-performance wheel loader hydraulic systems. Constructed with a highly durable cast iron housing, this transmission pump is built to withstand the rigorous demands of industrial, earthmoving, and construction environments. It features a precision-machined splined drive shaft and a secure flange mounting system to ensure reliable power transmission and straightforward installation. Equipped with a side port configuration for efficient fluid routing and an identifiable OEM nameplate (Ref: 012336/003), this replacement pump guarantees optimal hydraulic fluid flow, pressure retention, and extended service life for your heavy machinery.