OKIDATA ML590 Service Manual page 166

NOTE:
Installation
The tractors must be synchronized. Align the synchronization marks (9) in the same direction.
Verify that the guide holes (10) in the tractor drive gears are facing the same direction.
The left tractor assembly must be positioned to the left (line feed motor side) of the plastic tab and
ground plate.
Lubrication
When lubricating, refer to Section 3.5 of this Service Handbook.
P/N 50097501 Tractor: Assembly (Narrow)
P/N 50097502 Tractor: Assembly (Wide)
P/N 51228001 Gear: Change
P/N 51228101 Gear: Tractor
RSPL 590 B.2.05
RSPL 591 B.2.05
RSPL Both B.2.04
RSPL Both B.2.04