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Bobbin Shaft Overhaul
•
This repair requires timing and other adjustments and can only be done by an authorized ser-
vice technician.
Bobbin shaft components that might require replacement are the two radial bearings located on the
front and back of the machine. The bobbin shaft affects the under thread sewing operations.
Replacement Parts Needed:
• Radial Bearing (order two PN: 30951-05)
When replacing the radial bearings, always replace both of them as a pair.
Figure 1 - Bobbin Shaft Front View
Figure 2 - Bobbin Shaft Timing Pulley (Rear)
Replacement Procedure
1. Remove the needle plate.
2. Remove the rotary hook support.
3. Remove both of the rotary hook guards.
4. Remove the rotary hook.
5. Remove either the left or right arm cover and remove the screw from the back of the other one.
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