2-10.Synchronizer Mechanism; 2-11.Upper Shaft Mechanism - Brother RH-981A Service Manual

2. DISASSEMBLY
2-10. Synchronizer mechanism
3714Q
1. Loosen the two set screws (1) and (2), and remove the pulley assembly (3).
2. Loosen the two screws (4), and remove the synchronizer assembly B (5).
3. Remove the two screws (6), and the NP support bracket B (7).
2-11. Upper shaft mechanism
3715Q
1. Remove ball bearing cap S (1) and the retaining ring (2).
2. Loosen each set screw (2 each) of the needle bar gear (3), the zigzag cam (4), and the upper shaft tension pulley
assembly (5).
3. Pull the upper shaft (6) in the direction of the pulley to remove it. The upper shaft unit will come off.
RH-981A
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