Play Between Hook Gear And Lower Shaft Gear - Pfaff ambition essential 1.0 Service Manual

9. Play between Hook gear and lower shaft gear

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 (max 0.5) should be found on one position.
Adjust
1. Remove free arm cover and needle plate.
2. Remove the bobbincase.
3. Loosen the three screws (b,c,d) on the lower shaft gear (A),
4. Move the lower shaft gear (A) right or left to change the axial play.
4. The maximum axial play of the hook should be within 0.5 mm in one position.
5. When a good play is obtained, tighten the three screws(b,c,d)
NOTE! This adjustment will affect the setting: Timing of needle and hook.
a
1
Settings
b
104 73 15-26
e
c
a
d
2
A
19