Pfaff ambition essential 1.0 Service Manual page 9

12. Setting the bobbin stop to the bobbin.
13. Setting the feed dog in relation to the needle plate
Sideways the feed dog should be symmetrically set in relation to the needle
plate slot.
14. Feed dog height
When Feed dog teeth are in its highest position they should be 0.9-1.05
mm above the needle plate.
15. The needle bar height
When the needle bar is in its lower turning position the distance between the upper
end of the needle and the surface (B) of the hook ring should be 28.55 (+ 0.2 mm).
16. Threading device
With a new # 70 needle the threader hook should go smoothly into the
needle eye.
17. Presser foot height and parallelism to the needle plate
When the presser foot is in its highest lifting position it shall be
approx. 7-7.2 mm above the needle plate.
The presser foot should be parallel to the feed dog.
18. Height of presser bar's guide piece
The gap between presser bar and guide peice should be around 0.5 mm.
19. Setting the IDT excenter
Check position of feed cam marking (a) with marking on arm shaft and
screw.
20. Adjustment of the IDT foot - height.
21. Adjustment of the IDT foot - feeding position
The front edge of the IDT foot must be between the fi rst and second
tooth of the centre row of the feed dog.
22. Setting IDT foot sideways
The front edge of the IDT foot must be in the middle of the
center feed dog.
Settings - Quick reference
104 73 15-26
f
e
g
c
1
28.55 mm
D
Fig 1
D
7~7.2 mm
3
0.5 mm
1
g
3
3
3
a
d
0.9~1.05mm
Fig 2
c
e
d
5.6-5.8 mm
9