Kubota 3A851-72170 Expansion Valve Assembly

The 3A851-72170 is a block-type air conditioning expansion valve designed for Kubota agricultural tractors. It regulates refrigerant flow from the receiver-drier into the evaporator core, maintaining proper cooling performance in the operator cab. The valve features a flange-mount block configuration with metric O-ring style connections. It is rated for 1.5 ton cooling capacity and compatible with both R12 and R134a refrigerant systems. This expansion valve serves as a direct replacement for Kubota OEM part number 3A851-72170 and supersedes earlier part numbers T1275-72170 and T1855-72160. The valve incorporates precision metering orifice and thermostatic control elements engineered for consistent superheat regulation across varying ambient temperatures and engine loads typical in agricultural operations.