Specifications

6. Remove the adjustable fixed knife and the under thread presser.
7. Replace the required new parts.
8. Install the socket head cap screw to secure the adjustable fixed knife and the
under thread presser. Snug the cap screw until the parts are held securely. Do
not over tighten.
9. After replacing an adjustable fixed knife or under thread presser, refer to the
trimmer adjustment procedures later in this chapter for the adjustable fixed
knife.
Movable Knife Drive Arm
1. Remove the screws holding the needle plate. Remove the needle plate.
2. Remove the screws holding the front and rear bed covers. Remove the covers.
3. Lift the forward end of the connecting link from the pin on the movable knife
drive arm (see Figure 4-5).
4. Refer to Figure 4-6 and remove the external retaining ring from the bottom of
the movable knife drive arm. (Also see Figure 4-12 for retaining ring reference.)
5. Once this clip is removed, the arm shaft is free to be remove out of the top of the
needle plate bracket.
Movable Knife
Drive Arm
External
Retaining
Ring
Movable
Knife
Needle Plate
Bracket
Connecting
Link
Figure 4 - 6
Movable Knife Drive Arm 4 - 9
110291-01, Rev D 4. Trimmer Maintenance