− 168 −
Feed pitch error will be caused unless
the tension is proper.
(1) Replacing the top feed belt
24-1 Replacing procedure of feed belt
Caution : The standard of the time of replacement is one year although it depends on the
frequency of use.Replace the belt with a new one when it is observed that feed force is
excessively deteriorated or the like.
Caution : Perform periodical cleaning approximately once a week since dust is collected inside the
top feed cover and the belt rolls the dust resulting in feed trouble or short life of the belt.
■ Belt tension adjusting procedure
(1) Main feed belt :
Move tension adjustment plate L !2 to the left or
right to adjust the belt.
• The tension is increased in the right-hand
direction (direction A) and decreased in the left
direction.
(2) Auxiliary feed belt :
Move tension adjustment plate S !3 to the left or
right to adjust the belt.
• When it is opened on both sides (direction B),
the tension is increased, and when it is closed, the
tension is decreased.
(3) Adjusting the belt tension value :
1) Main feed belt :
The belt has to be bent by 3 mm when it is
pressed with a load of 1.3N (130gf).
2) Auxiliary feed belt :
The belt has to be bent by 3 mm when it is
pressed with a load of 0.4N (40gf).
24. MAINTENANCE
1) Remove ten cover setscrews 1 and remove
coverR 2 and cover F 3.
2) Loosen intermediate presser foot screw !0 and
remove intermediate presser foot !1.
3) Loosen walking foot setscrew 4 and remove
walking foot 5 and auxiliary walking foot 6.
4) Remove main feed belt 7 and auxiliary feed belt
8, and replace them with new ones.
5) Put walking foot rod 9 between 5 and 6, and fix
with screw 4.
6) After adjusting the belt tension, attach cover R 2
and cover F 3.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
4
5
9
6
1
1
2
Press the center.
8
7
!2
!3
3
A
B
B
!0
!1
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