The nominal torque values of the electromagnetic clutches are valid only after a break-in period. In order to accelerate the running-in period, we recommend that the clutch be engaged ten or twenty times at high speed with the vacuum pump. The clutch can be used with a rotation opposite to the one indicated by the arrow if the nominal torque is not exceeded by 50%. If the nominal torque is exceeded, the contact faces will slip together; this condition is permissible for a maximum of three seconds. When assembling, check that the pulley is perfectly clean and remove all traces of oil and grease.
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