JUKI MF-7900 Series Engineer's Manual page 139

Adjustment procedures
5. Adjusting the clutch tension spring
(1) Adjustment is performed with clutch tension spring ❶ so that
the top roller does not overrun at high-speed rotation.
(2) When performing the adjustment, loosen cap nut ❷ , and turn
nut ❸ to the right (clockwise) to increase the spring pressure.
(3) When decreasing the spring pressure, turn nut ❸ to the left
(counterclockwise).
(4) After the adjustment, tighten cap nut ❷ .
(Caution) The standard of the spring pressure is to such an ex-
tent that clutch tension spring ❶ turns with the small
force of your finger after tightening cap nut ❷ .
6. Grease lubrication system
(1) Periodically perform greasing once a year as the standard.
(2) Use the exclusive grease supplied as the accessories.
• Grease tube (Part No. 13525506)
(3) Remove the upper roller cover, and remove the screw in sec-
tion A.
(4) Fully pour the grease supplied as the accessories out of the
section A into the device.
(5) After pouring the grease, install the screw and the upper roller
cover.
Results of Improper adjustment
– 125 –