Pfaff 339 Owner's Manual - Page 64
Motor-drive
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1 * * Motor-drive The machine has a belted motor-drive. The belt should never be too tight nor too slack to ensure smooth troublefree action. There should normaly be just a slight give. As the tightness of the belt may vary after some time, you should once in a while take off the ventilation plate 31 on the righthand side of the machine by loosening the four fastening screws. The belt should be just so tight that its steel wires keep engaging the regulating wheel 29, causing it to roato evenly. The regulating wheel can be adjusted after loosening screw 30. When retightening the wheel bracket make sure the rubber lining fits well. The motor requires no particular care. Only the carbon brushes will have to be replaced after a number of years. 66
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