Position of the hook and needle
Service instructions 967 - 00.0 - 12/2014
51
10 Position of the hook and needle
10.1 Tensioning the hook drive belt
A special measurement tool is required to achieve the necessary setting.
If you have to guess at the setting for the belt tension, bear the following
points in mind:
• If the tension is too high, the working life of the belt and ball bearings is
reduced.
• If the tension is too low, the belt may jump off the pulleys.
Correct setting
When the toothed belt (2) is pressed in the direction of the arrow, about
midway between the pulleys, the belt should deflect about 3 mm.
Cover
• Drive belt cover (
page 13).
• Tilt the upper section ( page 10).
Figure 34: Tensioning the hook drive belt
Setting steps
1. Loosen the adjusting screw (3).
2. Turn the eccentric pin (1) with the tensioning pulley, and tension the
toothed belt (2).
3. Tighten the adjusting screw (3).
Note that a low tightening torque when turning the eccentric pin (1) can
lead to a high tension of the toothed belt.
4. Check the belt tension and adjust it if necessary.
WARNING
Risk of injury
Switch the machine off before checking or setting the hook
and needle bar on the machine.
(1) - Eccentric pin
(2) - Toothed belt
(3) - Adjusting screw
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