Check And Adjustment Aid - Pfaff 910 Series Service Manual

2

Check and adjustment aid

.05
Fig. 2 - 01
Turn the balance wheel until the needle bar has approximately reached the required
position.
Place the 5 mm blocking pin in the appropriate hole and put pressure on it.
Turn the balance wheel forwards and backwards a little until the blocking pin moves
into the slot in the crank behind the bearing plate, thus blocking the machine.
Hole 1
Hole 2
Hole 3
Hole 4
By blocking with holes 1 - 4 the required needle bar positions can be fixed
exactly.
= 2.0 mm after the bottom dead center of the needle bar (2.0 past tdc)
= Top dead center of the needle bar (tdc)
= 0.25 mm after the top dead center of the needle bar (0.25 past bdc)
= 1.0 mm after the top dead center of the needle bar (1.0 mm past tdc)
5
1
2
4
3
Adjustment
5
1
2
4
3
2 - 2