Pfaff 938 Manual

A SERVICE OF

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Adjustment

12 - 2

92-021

Fig. 12 - 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

= 2.0 mm after the bottom dead center of the needle bar (2.0 past tdc)

Hole 2

= Top dead center of the needle bar (tdc)

Hole 3

= 0.25 mm after the top dead center of the needle bar (0.25 past bdc)

Hole 4

= 1.0 mm after the top dead center of the needle bar (1.0 mm past tdc)

Hole 5

= 4 mm after the bottom dead center of the needle bar (4.0 past bdc)

12.04 Check and adjustment aid

By blocking with holes

1

-

5

the required needle bar positions can be fixed

exactly.

81-016

4

2

5

1

3