Pfaff 433 - Page 23

Insfrucfions for Mechanics
20. The V-Belt Drive
When mounting the V-belf for the first time, remember that a crookedly
mounted belt will wear more quickly. Hence, do not force the belt on the
pulley.
The various motors which are used to drive the PFAFF 433 are standard
motors which meet German DIN 42691 requirements. They are hinged on the
motor bracket by means of a hinge stud and, after loosening a set screv/
or a nut, can be
readily swung to any desired position in order to tension
the belt. (See PKA
motor pictured in photo 18).
It takes some experience to set the tension on the belt correctly so as to
avoid excessive pressure on the top shaft bearings and attendant over-
heoting and seizing of the machine.
Photo 18
The belt is correctly tenstoned if you con readily compress it cuboui ^'4
of on inch midway between the pulleys.
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From the library of: Superior Sewing Machine & Supply LLC