Brother SB3734T Service Manual page 26

Disassembly
<For thread tension dial blue>
8. Remove the nut 1 M4 to remove the tension disc A, the tension release disc B, the thread tension
spring S (XB0817) and the spring (X77414) from the thread tension shaft.
*Assembling note
• Fully tighten the screw after performing
9. Remove the retaining ring E3 to remove the thread tension dial, the wave washer and the washer plain
M4 from the thread tension shaft.
10.Remove the thread tension nut from the thread tension shaft.
Thread tension spring S
(XB0817)
Tension disc A
Tension release disc B
Nut 1 M4
Main frame / Covers / Upper thread guide
"Thread tension
Thread tension shaft
Spring (X77414)
Fig. 2-13
2 - 15
adjustment".
Wave washer
Washer plain M4
Thread tension nut
Retaining ring E3
Thread tension dial