9
MECHANICAL ADJUSTMENT
TOP TENSION
TO CHECK:
1.
Set the tension dial at “4” and raise the presser foot.
2.
Pass the thread (A) between the discs and draw the thread (A) down around the check spring
holder as in fig. 1.
3.
Lower the presser foot and bring the thread (A) up.
4.
Top tension should be 75 - 90g when pulling the thread (A) up in the direction of (B).
If it is not within the above limits, adjust as follows.
* Use polyester sewing thread #50 (white).
ADJUSTMENT PROCEDURE:
1.
Remove the front cover unit. (See page 7)
2.
Pull the spring (C) away from the lead screw (D) in the direction of allow as illustrated.
3.
If the top tension is too loose, turn the lead screw (D) in the direction (E).
If the top tension is too tight, turn the lead screw (D) in the direction (F).
(C)
(D)
Thread tension dial (4)
(E)
(F)
(C)
Tighten
Loosen
Detach
(D)
Pull this way
(
B)
(A)
FIg.1
Summary of Contents for HD718
Page 1: ...SERVICE MANUAL PARTS LIST MODEL HD718 First Edition 19 May 2017...
Page 33: ...PARTS LIST...
Page 42: ...40 MODEL HD718 PARTS LIST 1 2 3 4 5 6 7 8 9 10 11 12 16 9 13 14 15 18 17 20 24 23 21 23 22 19...
Page 44: ...42 MODEL HD718 PARTS LIST 1 4 2 5 3 6 8 9 20 19 18 17 15 13 12 11 10 16 21 4 7 5 11 14...
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