Duplo DF-920 Maintenance Manual page 15

2-1-5. Attaching the motor pulley
If the motor pulley is not attached at the proper position, slipping of the drive belt and abnormal wear may result.
Replace the main motor using the following procedure.
q Attach the motor pulley to the main motor at the
position shown in the figure.
w After attaching, rotate the main motor and check that
the belt does not slip.
2-1-6. Attaching the paper feed clutch unit
With the DF-900 series, an electromagnetic clutch is used as a paper feed clutch to enhance processing speed and
stabilize paper feed performance.
Replace the paper feed clutch using the following procedure.
q Check for thrust play of the paper feed clutch drive shaft at the clutch bracket side. At shipment, a shim (adjusting
washer) is inserted between the paper feed clutch drive shaft and bearing to control thrust play to below 0.1 mm
(0.004").
Check that thrust play is not minus (pressed state).
w While ensuring the q state, insert the bearing at the main bracket side, and secure the paper feed clutch unit.
e Apply a very small amount of oil to the area where the drive shaft and bearing are connected. (Orelube G90-140)
r Check that the paper feed drive gear (42T) and paper feed clutch gear (33T) are engaged appropriately along the
whole circumference (backlash: 0.1 to 0.2 mm (0.004" to 0.008")), and that they rotate smoothly.
Adjust the backlash by changing the clutch bracket position.
t Apply grease to the whole circumference of the gear teeth. (Orelube G1650)
12H-M12M0-0309-0
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