Setting the hook and the needle bar
Service Instructions 878-M PREMIUM - 03.0 - 10/2019 37
10.3 Setting the needle bar height
Order
First, check the following setting:
• Loop stroke position ( p. 39)
• A straight and undamaged needle has been inserted ( Operating
Instructions)
Proper setting
The machine is locked in position 1 ( p. 21).
The hook tip is at the height of the lower third of the needle groove.
Error
Errors at the erroneous height of the needle bar
• Damage to the hook tip
• Needle thread seizing
• Missing stitches
• Thread breaking
• Needle breakage
1. Remove the head cover ( p. 17).
Fig. 25: Setting the needle bar height
2. Loosen the screw (1) of the needle bar (2).
3. Move the needle bar (2) to such height that the hook tip (3) is positioned
in the center of the bottom third of the needle groove (4).
Do not turn the needle to the side. The needle groove (4) must face
the hook.
4. Tighten the screw (1) of the needle bar (2).
Order
Then, check the following settings:
• Position of the needle guard ( p. 39)
(1) - Screw
(2) - Needle bar
(3) - Hook tip
(4) - Needle groove
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