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6.Play between Hook gear and lower shaft gear
If there is too much play on the hook gear on the turning direction, it may be the cause for machine not to
sew properly and/or making excessive sewing noise. It is impossible to obtain an equally large play in one
rotation of the cog wheel, but it should be as small as possible at the tightest spot during the revolution.
Check
1.Move the cog wheel with the hand wheel and check play of the gears at 4 positions – at each 90 degree
angle.
2. At each position - rotate the hook back and forth with the fi nger tip to check the play.
- a play should be found in all differant positions.
- a small play (0.1- 0.3 mm) should be found on one position.
Adjustment
1.
Remove free arm cover and needle plate.
2.
Remove the bobbincase.
3.
Loosen the three screws (A, B, C) on the lower shaft gear (D).
4.
Move the lower shaft gear (A) right or left to change the axial play.
The maximum axial play of the hook should be within 0.3 mm in one position.
5.
When a good play is obtained, tighten the three screws (A, B, C).
NOTE! This adjustment will affect the setting: Timing of needle and hook.
Settings
a
View from upward
b
View from frontward
0.1-0.3 mm
Summary of Contents for VIKING Designer Jade 20
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