Oki 393 Tractor Phasing

Tractor phasing in the Oki 393 is correct when the following conditions obtain:

a) The timing marks (holes) in the two gears are directly facing one another.

b) The timing marks on the two large round sprockets are facing rearward.

c) The timing marks on the tractor-drive sprockets are facing forward.

Any time you have the tractors dismantled, take the opportunity to dab the sprockets' timing marks with Liquid Paper. They'll be a lot easier to see when they're in the machine.

Verify the tractor phasing by loading one sheet of tractor-feed paper, and hand cranking it toward the large round sprockets. The pins on the large sprockets should mesh perfectly with the paper coming from the tractors.

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