Pfaff 1425 Instruction Manual page 48

Adjustment
11. Needle rise, hook clearance, needle height (final adjustm.) and needle guard
04.10
(On the PFAFF 1426 carry out this adjustment on both hooks)
5
11 - 12
Requirement
At stitch-length setting "4" and needle bar at 2 mm b.d.c.:
1. the hook point must be at "needle centre" with a hook-to-needle clearance of
0.05 to 0.1 mm;
2. the top of the needle eye must be 0.8 mm below the hook point;
3. and needle guard 8 must touch the needle just lightly.
4
2
8
6
7
0.05 - 0.1 mm
Fig. 11 - 10
Set stitch length "4" and loosen screws 1, 2, 3 and 4.
Set needle bar at 2 mm past b.d.c. and set hook point at "needle centre."
Set hook clearance according to Requirement 1 and tighten screws 1.
Turn shaft 5 so that there is a play of 0.1 mm in the coupling and tighten screws 2.
Making sure there is a slight play in the gear, move the collar up and tighten screws 3.
1
3
1