Replacing The Hook Driver Drive Belt - Bernina B 590 Service And Maintenance Manual

4.3.3 Replacing the hook driver drive belt

Disassembly:
• Remove presser foot and needle.
• Remove stitch plate.
• Remove the covers (see 4.1)
• Picture1 – remove the springs A, x and y.
• Removal of clutch carriage (see 4.3.11)
• Picture 2 – Remove screw 2 (T20, M4X10mm)
down at center of rotation of the thread cutter
release link. Remove the whole unit.
• Removal of hook and hook driver (see 4.3.1)
• Picture 3 – Remove 4 fastening screws 3 (T20,
M4X10mm) of the feed dog fork complete and the
attached position plate from the hook driver.
• Remove hook driver drive belt.
Assembly:
• Refit hook driver drive belt.
• Picture 3 – Refit the feed dog fork complete with
the attached position plate for the hook driver,
slightly retighten the 4 fastening screws 3, taking
care not to jam the hook driver drive belt.
• Picture 4 – Set the feed dog fork with adjusting
gauge 734541.70.00 in the right position
(see 4.3.1) and tighten the 4 screws 3 (T20).
• Picture 1 – Rehook springs A, x and y, taking care
that the slide block sits properly in the feed cam.
• Position stitch plate, taking care that the feed-dog
sits centred in the opening. Retighten the 4
screws. Remove stitch plate.
• Refit hook driver and hook (see 4.3.1)
• Adjust loop lift (see 5.5.3)
• Picture 2 – Refit thread cutter release link with screw 2, take care that the end of the release link fits
into the slot of the thread catcher.
• Refit clutch carriage (siehe 4.3.11)
• Adjust clutch carriage and thread cutter (see 5.7)
• Refit covers
(see 4.1), stitch plate, needle and presser foot if appropriate.
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