Pfaff 3339 Instruction Manual page 46

Adjustment
Fig. 11 - 13
11 - 14
If the hook point is not directly behind the needle, proceed as follows:
Remove the clamp screw.
Loosen the three screws 3 just enough so that the V-belt wheel can be rotated with
difficulty.
Hold the V-belt wheel and turn the toothed belt wheel a little.
Set the needle bar rise and repeat the following points until the hook point is directly
behind the needle:
– Rotate the hook simultaneously with the driver until the hook point is directly
behind the needle.
– Rotate the V-belt wheel backwards until the clamp screw is touching the needle
bar frame. The hook point must be directly behind the needle bar.
Taking care to ensure that the toothed belt wheel is touching on the right hand side,
tighten the screw 3 that is accessible.
Remove the clamp screw from the needle bar.
Tighten the other screws 3.
Remove the hook from the hook race and tighten screw 1 on the driver.
3