55
66
44
3. Installing the knee lifter (Fig. 4)
Install the knee lifter on the knee lifter hinge
shaft and fix it by screw .
5. Installing the V-belt (Fig. 6)
(1) Lower the machine head and install the belt
on the hand wheel and motor pulley;
(2) Press the belt by forefinger with the power
of 4.9N (500gf), adjust the nut to make the belt
a slack of 10~14mm.
4. Adjusting the knee lifter mechanism (Fig. 5)
(1) Lay down the presser foot lifting bar to
lower the presser foot ;
(2) Loosen the nut ;
(3) Press the knee lifter plate cover to make
movement amount of the knee lifter positioning
bracket about 2mm, then adjust the screw ;
(4) After adjustment, tighten the nut .
(5) Loosen the nut ;
(6) Adjust screw to make its length above the
bracket 8mm;
(7) Adjust screw , the clearance between presser
foot and needle plate should be less than 13mm when
the knee lifter is pressed to its maximum position;
(8) After adjustment, tighten the nut .
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