One New Aftermarket Replacement Manifold Heat Exchanger for John Deere Tractors

This manifold heat exchanger mounts between the intake and exhaust manifold sections on classic John Deere two-cylinder gas tractors, transferring heat from the exhaust side to warm incoming intake air and fuel for improved cold-weather starting and combustion efficiency. It is a direct drop-in replacement for the original John Deere (JD) A4644R heat exchanger used across the 60-series and 70-series tractor families.

Compatible Models

John Deere Tractors: 60, 70, 620, 630, 720, 730

Replaces Part Number(s):

A4644R, A4644, A4644-A, A4644R-A, TPA4644R, BH-A4644R

New aftermarket replacement part - not remanufactured, not used.