Main Shaft And Synchronizing Disc - Bernina 330 Service And Maintenance Manual

4.3.10 Main shaft and synchronizing disc

Disassembly:
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Remove covers.
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Loosen setscrew 7 (T10) and screw 17 (T30 M6X20).
•
Remove drive belt.
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Release base shaft belt.
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Loosen two screws 5 (T20 M4X10), remove clamps.
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Pull entire base shaft off balance piece and slide out to the right.
Assembly:
•
Position balance piece in such way that the thread take-up lever faces the front.
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Insert main shaft into balance piece from left and through base shaft belt.
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Place spherical bearing into socket and fasten with two clamps and two screws 5 (T20 M4X10).
Important: Plastic washer 14 and shim washer 15 must be positioned correctly.
•
Push balance piece towards spherical bearing smoothly (without play or jamming).
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Retighten setscrew 7 (T10) and screw 17 (T30 M6X20).
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Loosen setscrew 10 (T8).
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Use adjusting tool 030349.70.00 (on the flat side) to pin balance piece.
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Position synchronization disc in such way that setscrew 10 can be tightened via the hole in the back.
•
Remove lower screw of main motor, loosen upper screw, raise motor and retighten upper screw.
•
Use pinning tool 002733.50.00 to pin hook drive crank.
•
Loosen two setscrews 6 (T10).
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Reposition base shaft belt and tighten.
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Retighten two setscrews 6 (T10).
•
Remove pinning tools.
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Reposition drive belt and tighten.
•
Reconnect and refit front cover
•
Adjust synchronization disc
•
Refit covers.
•
Calibrate speed (Chapter 6 Item II. Speed control
•
Functional check.
•
Sewing-off.
BERNINA International AG · Seestrasse 161 · CH-8266 Steckborn · Switzerland
15
14
7
5
17
(Chapter 4 Item 4.1.5 Front
(Chapter 5 Item 5.7.1 Position of synchronizing
10
cover).
calibration).
6
6
5
disc).
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