Brother BAS-340 - Lower Shaft and Rotary Hook

00 Lower shaft and rotary hook {1)
1) Tilt the machine.
2) Insert the rock gear shaft 0 into the arm from the rear. Pass the washer@, the rock gear @) and the set
collar 0 through the rock gear shaft 0, and attach the stop ring to the shaft 0.
3) Put the rock gear @) between the set collar 0 and the stop ring and vertically adjust so that there is no
end play between rock gear@) and the shaft 0. Then tighten the set screw of the set collar 0.
4) Pass the lower shaft assembly 0 through the lower shaft bush from the rear of the arm and insert it into
the set collar ®.Pass through the shuttle race base assembly fi and place the stop ring on the lower
shaft assembly 0.
5) Vertically adjust the lower shaft assembly 0 so that there is no end play. Tighten the set screw of the set
collar@).
6) Adjust the rock gear shaft 0 so that there is no backlash between the lower shaft gear @ and the rock
gear@). Then tighten the set screw.
NOTE: Apply grease to the rock gear@).
7) Place the driver @ on the lower shaft assembly 0 and make it touch the stop ring, then temporarily
secure it.
8) Return
the machine to its original position.
-35-
From the library of: Superior Sewing Machine & Supply LLC