Changing The Cord Belt - Pfaff 260 Service Manual

Changing the Cord Belt
1. on machines with pinned balance wheel bushing:
a . Remove the face and top covers, and strip the presser bar assembly.
b. Take out the eccentric stud connecting the needle bar frame pitman to
the needle bar frame, and swing the latter up.
c. Strip the remari ning front parts, such as the toke-up lever.
d. Knock the pin out of the needle bar crank and pull this crank off the
arm shaft, without applying force.
e . loosen the sef screws in the driving eccentric for the automatic embroi-
dery mechanism, the arm shaft bevel gear, upper driving belt sprocket,
and feed eccentric.
f. Pull the arm shaft to the righ t until its left end is in line with the upper
driving belt sprocket, and change the cord belt.
To assemble, reverse the above procedure. Take care that all parts are re-
placed in line with the appropriate timing marks.
2. on machinos with pinned arm shaft bU1ihing (Fig. 99):
a . Knock the pin out of the balance wheel bushing and pull the bushing
off the arm shaft. In this case, the needle bar crank remains pinned on
the arm shaft.
b. Having completed the preparations mentioned in par. 1 above, the arm
shaft is pulled forward, i. e . toward the needle-bar end of the machine,
until its right end is in line with the upper driving belt sprocket.
c. Replace the old cord belt by a new one.
To assemble, proceed in the reverse order. Take care that all ports are
replaced in line with the appropriate timing marks.
Fig.
99
Removing the bola nee wheel
61