BERNINA International AG Seestrasse 161 CH-8266 Steckborn Schweiz Seite 58 von 172
DRAFT – VERSION
4.3 Electromechancial/Mechanical Components
4.3.1 Hook and hook driver
Disassembly:
• Remove all covers (see 4.1
).
• Remove thread-cutter unit (see 4.3.4).
• Remove bobbin case.
• Remove hook.
• Picture 1- Unhook spring 3 of feed-dog carrier.
• Picture 2 - Unhook tension spring 4 between
clutch carriage and belt tensioner 5.
• Picture 2 - Remove belt tensioner 5 with screw 6.
• Picture 3 - Untighten hook driver shaft securing
screw 7 (T8).
• Bring hook driver into its neutral position, then pull
out carefully, pushing slightly from the back with a
screwdriver (e.g. T8) if required.
Note:
The hook driver is in its neutral position if the hook driver
cams protrude from the hook driver casing the same
length.
• Picture 4 - Remove the three fastening screws 2
(T20) from the hook race ring. Carefully remove
hook race ring.
Note:
Take care not to lose the spherical washers.
Assembly:
• Carefully insert hook race ring a, taking care to
position the 3 spherical washers b correctly, i.e. flat
side up and sitting between hook race ring and
aluminium base.
Picture 4 - Tighten the 3 securing screws 2 (T20)
only so much that the hook race ring can still be
moved in x-axis direction. Hook race ring movement
is locked for all other directions.
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