Baby Lock BL7800 Service Manual page 14

38. Install the tension releaser plate onto the pin, then install the CS retaining ring.
39. Attach the bace plate using the three screws.
40. Attach the power supply unit assembly using the two screws, and insert the inlet connector.
41. While attaching the timing belt, assemble the lower shalt assembly using the metal pressers and screws.
42. Position the outer rotary hook and three spacers with the lower shaft assembly (refer to following illustrations),
and attach using the screw.
43. Attach the FPM holder assembly using the two screws.
44. Install the drop guide using the screws.
45. Attach the horizontal feed shaft breacket using the screw, and attach the horizontal feed assembly using the
metal presser and screw.
46. Insert the shaft of the feed rod into the feed block, and catch the two feed rod tension springs.
47. Attach the tension pulley holder using the screw.
48. Attach the NP PC board assembly using the screw.
49. Insert the timing belt over the upper shaft and attach using the metal pressers and two screws.
Assembly Points
41. Install the lower shaft assembly with the hole (A) in the lower shaft eccentric metal facing toward the front of
the arm-bed. (Make adjustments while refering to section "6. LOWER SHAFT" on page 27.)
41. After installing the lower shaft, check that it moves smoothly. If its movement is not smooth, lightly tap the
bushing presser with a punch, then check the movement again.
41. Install the outer rotary hook with the lower shaft reference hole (B) in the cam and the outer rotary hook
baseline (C) facing toward the front of the arm-bed.
42. Install the rotary shaft washers with the thick one facing upward.
42. Adjust the outer rotary hook and lower shaft play (rotating direction clearance of the outer rotary hook) by
adjusting the position of the hole in the eccentric metal. Moving the hole downward decreases the play.
Although the ideal position is facing forward, if there is an unsually large play, adjust the position in order to
prevent the rotary hook from generating an irregular noise.
43. The screw (D) used to install the top of the FPM holder should have a 14mm screw.
43. Install a spacer (poly washer) on the right side of the feed adjusting assembly.
43. Press the left side of the FPM holder assembly until the feed adjusting assembly does not shake, then
tighten the screw. Do not apply pressure to the holder when tightening the other screw. After installing the
holder, check the operation and clearance of the feed adjusting assembly.
45. The screw (H) used to install the horizontal feed shaft bracket should have a 14mm screw.
45. Attach the parts with the drop knob moved to the right side.
45. Check that the feed bar moves forward and backward smoothly.
* If the feed bar does not operate smoothly, an incorrect feed pitch may be produced, or an incorrect forward
and backward motion of the feed bar may be produced.
46. Install the feed block with "S" mark facing toward the feed rod side.
46. Attach the feed rod supporting plate spring ((44)-1.) to the feed rod supporting plate.
47. After the tension pulley assembly is installed, adjust the tension of the timing belt. (Refer to (G).)
49. When installing the upper shaft, attach the two feed rod tensions prings (44) after install the timing belt and
inserting the feed adjusting shaft into the feed regulator slide block.
* After installation, adjust the rotating torque of the upper shaft.
49. To install the timing belt, align the lower shaft reference hole (B) with the lower shaft baseline (E) and move
the notch (F) in the horizontal feed cam so that it faces toward the front of the arm-bed, then install the
timing belt.
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