Working basis
Service Instructions 878-M PREMIUM - 03.0 - 10/2019 19
3.4.6 Disassembling and assembling the circular feed dog
Fig. 7: Disassembling and assembling the feed dog
Proper setting
1. The standard teeth increment above the throat plate slide:
2. The center-to-center distance of the feed dog teeth:
• Thin material – fine teeth to eliminate leather bruises.
• Fine-textured, thick material – larger teeth for sufficient material
pulling.
Important
The feed dog teeth increment above the throat plate and the teeth pitch
must be adjusted according to the thickness and toughness of the material.
Disassembling the feed dog
1. Disassemble the throat plate ( p. 18).
2. Remove the plug from the opening (3).
3. Move the feed-dog carrier (2) and the circular feed dog (1) up.
4. Replace the feed dog (1).
(1) - Feed dog
(2) - Feed dog carrier
(3) - Opening with a plug
(4) - Screw
(5) - Screw
(6) - Hexagonal key
Needle number/Nm (A) – feed dog teeth increment /mm
70 – 80 0.4 – 0.5
90 – 110 0.4 – 0.5
120 – 200 0.6 – 0.8
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