Thread trim
Service Instructions 878-M PREMIUM - 03.0 - 10/2019 57
14.5 Hook thread clamp
Fig. 47: Setting the hook thread clamp
Proper setting
The hold-down force of the clamp (1) should not be set at a value higher
than necessary. It should be able to pull the hook thread from the hook.
1. Perform sewing and the thread trim.
2. Using the screwdriver (2), pull the thread as shown in the picture and
determine whether the thread is pulled out from the hook under the
clamp (1).
3. Set and adjust the pressure of the hook thread clamp (1) using the
screw (3) until the instruction is complied with.
Error
If the hook thread clamp is set incorrectly, difficulties may appear during
sewing.
(1) - Hook thread clamp
(2) - Screwdriver
(3) - Screw
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