IBM 3 User Manual page 250

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4247 Model 003 User's Guide
6. Stand facing the front of the printer. Hold the forms tractor with the tractor
doors toward you, and the electrical connector tab on the left.
7. With both hands supported on the round tractor shaft, position the electrical
connector tab above its connector on the left side of the printer and the two
lowest pins on the right.
Rear Tractor Electrical Connector
Tractor Mounting Pins