Brother SB3734T Service Manual page 25

Disassembly
<For thread tension dial yellow, pink, green>
5. Remove the nut 1 M4 to remove the tension disc A, the tension release disc B and the spring (X77414)
from the thread tension shaft.
*Assembling note
• Fully tighten the screw after performing
6. Remove the retaining ring E3 to remove the thread tension dial, the wave washer and the washer plain
M4 from the thread tension shaft.
7. Remove the thread tension nut from the thread tension shaft.
Tension disc A
Nut 1 M4
Main frame / Covers / Upper thread guide
"Thread tension
Thread tension shaft
Spring (X77414)
Tension release disc B
Fig. 2-12
2 - 14
adjustment".
Wave washer
Thread tension dial
Washer plain M4
Thread tension nut
Retaining ring E3