John Deere R277935 Steering Pump Assembly

The John Deere R277935 is a hydraulic gear pump designed for the steering system of 5 Series agricultural tractors. It converts mechanical input into hydraulic energy to provide assisted steering control. The unit features a Parker CBT-E312F8H1R2 casting and is engineered to meet OEM flow and pressure requirements for reliable operation under agricultural field conditions. Key technical parameters include a rated operating pressure of 20 MPa and a rotational speed range of 700 to 3000 RPM. The pump housing is constructed from aluminum alloy to balance strength and weight. This part serves as a direct replacement for multiple John Deere OEM references across the 5-750 through 5-950 tractor model range.