Setting the hook and the needle bar
38 Service Instructions 878-M PREMIUM - 03.0 - 10/2019
10.4 Setting the side distance of the hook
Order
First, check the following setting:
• A straight and undamaged needle has been inserted ( Operating
Instructions)
• The needle bar linkage is aligned correctly ( p. 27)
• Loop stroke position ( p. 39)
Proper setting
The machine is locked in position 1 ( p. 15).
The distance between the hook tip and the needle groove is 0.02 to 0.1 mm.
1. Tilt the machine head ( p. 15).
2. Open the hook cover.
Fig. 26: Setting the side distance of the hook
3. Lock the machine in place at position 1 ( p. 21).
4. Loosen the four threaded pins (1) of the clamping ring (2).
5. Loosen the two screws (6) and the screw (8).
6. Move the hook column (5) away from the needle.
7. Tighten the screws (6) slightly, and using the feed screw (7) move the
hook column.
The distance between the hook tip (4) and the needle groove (3) is
0.02 to 0.1 mm.
The hook tip (4) shall not touch the needle.
(1) - Threaded pins
(2) - Clamping ring
(3) - Needle groove
(4) - Hook tip
(5) - Hook column
(6) - Screws
(7) - Feed screw
(8) - Screw
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