Feed dog
30 Service Instructions 171/173 - 00.0 - 01/2020
7.2 Adjusting the stroke movement of the feed dog
Fig. 18: Adjusting the stroke movement of the feed dog
Proper setting
When the needle tip reaches the needle hole, the descending tooth point
of the feed dog is level with the surface of the throat plate. This position
corresponds to slot D ( p. 13).
To adjust the stroke movement of the feed dog:
1. Loosen the screws of the stroke eccentric (3).
2. Lock the machine in place in slot D ( p. 13).
3. Turn the stroke eccentric (3) such that the middle of the 1
st
screw (4)
in the direction of rotation is level with the edge of the housing (2).
4. Align the gear wheel.
When at its highest position, the feed dog is 0.8 mm above the sur-
face of the throat plate.
5. Tighten the screws of the stroke eccentric (3).
Information
Exception for class 171-131110:
Left-hand machine: Slot F ( p. 13)
Set the 2
nd
screw in the direction of rotation of the stroke eccentric (3) level
with the 2
nd
screw in the direction of rotation of the pusher eccentric (1).
Right-hand machine: Slot D ( p. 13)
Set the 2
nd
screw in the direction of rotation of the stroke eccentric (3) level
with the 1
st
screw in the direction of rotation of the pusher eccentric (1).
(1) - Pusher eccentric
(2) - Edge of the housing
(3) - Stroke eccentric
(4) - Screw
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