3.8 Replacing right arm shaft bearing
Rule and control
The right arm shaft bearing must be replaced when the operation of
the arm shaft is sluggish.
Caution: Danger of bodily injuries !
Turn off main switch.
Switch off the sewing machine before replacing the arm shaft bearing.
ATTENTION !
Do not use any extraction tool !
When removing or installing the right arm shaft bearing no axial
pressure against the arm shaft should be exerted. Axial pressure in
head cover direction would result in a damage to the thread take-up
lever.
Replacing the arm shaft bearing
–
Remove both head covers.
–
Loosen the screw 1.
–
Remove the retaining springs 2 (2 pieces).
–
Loosen the screws 3 and 7.
–
Push the toothed belt off the upper pulley to the left.
–
”Unlever” the drive unit by 2 spanners.
The drive unit includes the toothed belt pulley, the V- belt pulley
and the ball bearing.
–
Remove the V-belt pulley 5.
–
Replace the toothed belt pulley, consisting of the pos. 4, 6, 8 and
9, completely (ref. no.: 0271 000322).
or : remove the ball bearing 8 by an extraction tool and press-in a
new ball bearing (Ref. no.: 0211 000362).
–
Re-install the V-belt pulley.
–
Fit the driving unit.
–
Fit the removed parts.
ATTENTION !
Following the replacement of the arm shaft bearing proceed to a new
adjustment.
1
2
3 4 5
6 7 8 9
60
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