LONG BLOCK M 20R3910 - Caterpillar

D3C Tractors had winches with these serial numbers: power shift-7WA, direct drive-5BD. Later D3C Tractors had winches with these serial numbers: power shift (PS)-9FA, direct drive (DD)-9GA. Some of the comparable parts in these winches have different part numbers and are NOT interchangeable.
When ordering replacement parts for a winch on a D3C Tractor, record the serial number of the winch and refer the appropriate Parts Book.
...For 7WA winches, see a Parts Book for D3B (PS) Tractors.
...For 9FA winches, see a Parts Book for D3C (PS) Tractors.
...For 5BD winches, see a Parts Book for D3B (DD) Tractors.
...For 9GA winches, see a Parts Book for D3C (DD) Tractors.