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Service Manual
SEC.11
Needle timing for feed dog
Note: After adjustment, be sure to follow "Needle timing to shuttle".
As horizontal and vertical feed motion is unitized on this model, adjustment of feed timing is
as follows:
Checking:
1. Bring needle bar to its highest position by turning hand wheel.
2. Check to see the motion of feed dog. It should be already in motion 0-0.3mm when
needle is started to lower.
Adjustment:
1. Remove front cover.
2. Adjust the angle of timing gear to lower shaft with two screws on timing gear loosened
and hexagon socket screw driver (2.5mm) inserted into one of the screws by turning
main shaft with hand wheel,.
If feed-dog motion too early → Turn hand wheel towards you.
If feed-dog motion too late
3. Tighten one of two screws temporarily and check feed-dog motion.
4. Tighten two screws securely after adjustment.
Feed dog starts to move a little bit
earlier than when needle starts to
go down.
→ Turn hand wheel away from you.
Upper feed cam (A) and Horizontal feed
cam (B) are fixed to lower shaft by knock
pin. Adjustment can be done by belt gear
part (C).
A
Original issue
May 2014
Page 31／64
Model
XL-420
B
C
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