Position of the hook and needle
48 Service Instructions 869-M PREMIUM - 00.0 - 07/2018
10.2 Setting the loop stroke position
Fig. 34: Setting the loop stroke position
The loop stroke is the path length from the lower dead center of the needle
bar up to the position where the hook tip is exactly on the vertical center
line of the groove for the needle.
The loop stroke is precisely 2 mm.
Order
First, check the following settings:
• Needle bar linkage is aligned correctly ( p. 42)
• A straight and undamaged needle has been inserted ( Operating
Instructions)
Proper setting
Machine is locked in place at position 1 ( p. 25).
The hook tip (1) points exactly to the vertical center line of the needle (2).
To set the loop stroke position:
1. Execute the service routine Needle-Hook > Timing
( p. 14).
The software is used to define the necessary presettings on
the machine.
2. Disassemble throat plate, throat plate slide and free arm
cover ( p. 22).
3. Disassemble the feed dog ( p. 23).
4. Lock the machine in place at position 1 ( p. 25).
(1) - Hook tip
(2) - Vertical center line of the needle
(3) - Threaded pins
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