Setting the hook and the needle bar
Service Instructions 878-M PREMIUM - 03.0 - 10/2019 35
5. Place the ring (2) from below to the hook as far as it will go.
6. Tighten the screw (1).
Information
When the hook is replaced, its height does not need to be adjusted again.
10.2 Setting the looping stroke
Fig. 23: Setting the looping stroke (1)
The looping stroke is the length of the path from the bottom dead center of
the needle bar up to the place where the hook tip is positioned accurately at
the needle grove axis.
The looping stroke is 2.3 mm.
Order
First, check the following setting:
• The needle bar linkage is aligned correctly ( p. 27)
• A straight and undamaged needle has been inserted ( Operating
Instructions)
Proper setting
The machine is locked in position 1 ( p. 21).
The hook tip (2) points exactly to the needle axis (1).
(1) - Needle axis (2) - Hook tip
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