2.12 Replacing The Right-Hand Arm-Shaft Bearing - Duerkopp Adler 743-221 Service Manual

2.12 Replacing the right-hand arm-shaft bearing

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Regulation and inspection
The right-hand arm-shaft bearing must be replaced if the arm shaft
does not run smoothly.
Caution: danger of injury
Turn off the main switch.
The arm-shaft bearing may only be replaced with the sewing machine
switched off.
IMPORTANT !
Do not use an extractor tool.
When the right-hand arm-shaft bearing is removed and replaced no
axial pressure must be exerted on the arm shaft. Axial pressure in the
direction of the head cover will damage the thread lever.
Replacing the arm-shaft bearing
–
Remove position sensor, handwheel, arm and head covers.
–
Unfasten the belt protector and remove it together with the belt.
–
Remove the 2 retaining springs 1.
–
Undo screws 2 and 6.
–
Carefully prise off the V-belt pulley with 2 screwdrivers or similar.
–
Remove the ball-race 4 with the extractor tool and remove circlip 5.
–
Fit the circlip to the new ball-race (order no.: 0211 000361) and
carefully press the complete unit onto the V-belt pulley.
–
Gently tap the V-belt pulley into place with a synthetic hammer.
–
Replace in reverse order the parts which have been removed.
2 3
4 5 6