A direct-fit replacement 12V 55A alternator for the John Deere 1040 and 1120 tractor range produced between 1970 and 1984. The alternator generates AC electricity as the engine runs, which is converted to DC power to charge the battery and supply the vehicle's electrical system. A failing alternator typically presents as a flat battery that will not hold charge, dimming lights under load, or complete electrical failure even with a known good battery.

Manufactured to OEM specification with internal regulator, external fan, clockwise rotation, V-belt pulley with 87mm outer diameter, 56mm bottom mount, and unthreaded top ear, cross-referencing John Deere OEM part number TY6791 for straightforward identification. Verify your model and year against the fitment table before ordering.

Fitment

Key Features

• Direct OEM-specification replacement alternator
• 12V / 55A output - clockwise rotation - external fan - internal regulator - V-belt pulley / 87mm OD
• 56mm bottom mount - unthreaded top ear
• Covers John Deere 1040 and 1120 tractors 1970-1984
• Replaces John Deere OEM part numbers TY6791, AL28516, AL35998, AZ26910, and TY6652

OEM Cross-Reference

Specifications