13
MC 9500
A
B
Adjusting Backlash between Hook Drive Gear and Lower
Shaft Gear
The rotary play of the hook should be 0.8 mm or less when the tip of the rotary hook is
within the width of the feed dog as shown below.
Adjust the backlash after the adjustment of the clearance between needle and rotary hook.
To check:
1 Turn the power switch “OFF”
2 Remove the base cover and bed cover. (See page 3 - 4)
3 Loosen the Hexagonal socket screw .
Jog the hook race with fingers to check the rotary play.
“If the play is larger than 0.8 mm or the gears do not turn
smoothly, adjust the backlash as follows”
Adjustment procedure:
1 Turn the Lower shaft bushing (Eccentric), in th
direction of “A” when the play at rotary hook tip is too
large.
2 Turn the Lower shaft bushing (Eccentric), in the
direction of “B” when the play at rotary hook tip is too
small.
3 Tighten the Hexagonal socket screw .
4 Reattach the bed cover and base cover.
Hexagonal socket screw
Lower shaft bushing
The rotary hook play should be 0.8 mm or less.
Tip of rotary hook
1
2
1
3
4
2
1
2
1
2
3
4
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