Pfaff 1540 User Manual
Page 84
82
47. Adjusting the arm shaft crank
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Press the straight stitch button.
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Carefully loosen screw 152 on arm shaft crank 153 just enough to allow the arm shaft crank to be tur-
ned on its shaft (fig. 107).
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Raise the needle bar and insert the needle.
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Firmly hold arm shaft crank 153 using the left hand.
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At the same time, turn the handwheel with your right hand until the feed dog is at the bottom and the
sewing hook point is centered between the feed dog rows.
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Now firmly hold the handwheel and at the same time turn arm shaft crank 153 until the needle bar rea-
ches its lowest position.
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Fit spacer 63-102600-18 on the needle bar.
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Place the needle-rise clamp 00-870137-01 onto the needle bar and tighten it just a little (fig 109).
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Place the 2.2-mm feeler gauge 00-870136-01 onto the needle bar with its cutout above the needle-rise
clamp.
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Push the needle-rise clamp and the 2.2-mm feeler gauge up against the spacer.
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Tighten the knurled screw on the needle-rise clamp.
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If there is play on the feeler gauge, repeat the above procedure.
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Remove the 2.2 mm feeler gauge.
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Hold the handwheel and turn arm shaft crank 153 in sewing direction until the needle-rise clamp rests
on the spacer.
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The sewing hook point must now be exactly opposite the center line of the rear side of the needle.
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If this is not the case, turn simultaneously handwheel and arm shaft crank 153 until the sewing hook is
exactly opposite the center line of the rear side of the needle with the clamp resting on the spacer.
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Remove the needle-rise clamp.
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Tighten screw 152 on arm shaft crank 153 until arm shaft 157 has no play and the needle rise move-
ment is correct.
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To this end, reposition the needle-rise clamp and check.
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Refit the needle plate.
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Adjust the sideways movement of the needle bar in accordance with section 18 (1520 / 30) or section
25 (1540).
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Fold the baseplate against the machine and fasten it with the four screws.
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Insert the housing insert and fasten it with the two screws.
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Then the following items have to be checked and adjusted on the machine:
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Adjustment of bobbin thread tension (section 34).
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Adjustment of needle thread tension (section 35).
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Adjustment of thread check spring stroke (section 36).
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Adjustment of equal forward and reverse stitch length for utility stitches (section 38).
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Carry out an electronic safety test in accordance to VDE 0701 using testing appliance ABB Metrawatt
M 5013.