Pfaff select 1520, Service Manual

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86
Refitting:
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Set the new bevel gear with the lifting eccentric onto the sewing hook bearing.
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Insert hook shaft bushing 109 and tighten screw 110 lightly (fig. 110).
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Insert the small hook driving shaft with the small bevel gear 111 and the two plastic washers.
Note:
The large surface of hook shaft bushing 109 must face to the right.
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Insert set screw 160 and fasten the hook bearing (fig. 111).
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Insert sewing hook 44 and tighten one of screws 108 (fig. 112).
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Push the hook driving shaft 45 to the left.
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Insert screw 112 into the large bevel gear and set it onto the surface of the hook driving shaft.
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Push the plastic washer to the right against the bearing.
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Fit the circlip making sure that the plastic washer is between bearing and circlip.
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Pull hook driving shaft 45 to the right as far as it will go and use one of screws 44 of the toothed belt
sprocket to remove any lengthwise play in the shaft (fig. 110).
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Insert and knock in hollow pin 161.
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Push driving eccentric 33 to the right.
Note:
Hollow pin 161 must always be visible on driving eccentric 33 on the opposite side of screw 112 in the lif-
ting eccentric.
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Place connecting bar 10 complete onto actuating crank 39 (fig. 111).
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Insert bolt 11.
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Insert washer 14.
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Adjust feed regulator cranks in accordance with section 7.
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Refit the feed-dog lowering mechanism.
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Connect pull-spring 6
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Push the small gear 97 onto hook shaft 45.
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Now the following adjustments must be carried out.
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Adjustment of feed dog height (section 4)
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Timing of feed motion (section 12)
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Adjustment of hook-to-needle clearance (section 28)
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Adjustment of bevel gears (section 28a)
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Sewing hook timing (section 29)
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Adjustment of needle bar height (section 30)
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Adjustment of bobbin case position finger (section 31)
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Adjustment of needle threader (section 32)
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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 equal forward and reverse stitch length for utility stitches (section 33)
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Making up a sewing sample (section 34)
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Carry out an electrical safety test in accordance with VDE 0701 using testing appliance ABB Metrawatt
M 5013.