Replacing The Arm-Shaft Bearing - Duerkopp Adler 271 Service Manual

13. Replacing the arm-shaft bearing

56
2
1
Regulation and inspection
The right-hand arm-shaft bearing must be replaced if the arm shaft is
running stiffly.
Caution: danger of injury
Turn off the main switch.
Replace the arm-shaft bearing 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 cover will damage the thread lever.
Replacing the arm-shaft bearing
–
Remove the position sensor, handwheel, belt protector and cover.
–
Remove the V-belt and 2 retaining springs 1.
–
Remove retaining ring 6.
–
Undo screws 2 and 4.
–
Push the synchronous belt off the upper synchronous-belt pulley to
the left.
–
Prise off the drive unit with 2 screwdrivers or similar.
The drive unit consists of: synchronous-belt pulley, V-belt pulley
and ball-race.
–
Remove V-belt pulley 3.
–
Remove the synchronous-belt pulley and replace it completely
(order no.: 0271 000322), or remove the ball-race 5 with an
extraction device and press on a new ball-race (order no.:
0211 000362).
–
Replace V-belt pulley.
–
Replace drive unit.
–
Replace the parts which have been removed.
IMPORTANT
The sewing machine must be re-adjusted after the arm-shaft bearing
has been replaced.
3
4 5 6