84
48. Changing the bevel gears
Note:
Always change bevel gears in pairs.
Removal:
z Remove the housing covers as described in this manual.
z Remove the synchronizer from the shaft to the right.
z Loosen the two screws 101 on small gear 97 (fig. 110).
z Remove small gear 97 from the hook driving shaft 45 to the right.
z Disconnect pull-spring 6 (fig. 111).
z Loosen screw 19.
z Remove the feed-dog lowering mechanism.
z Set the adjustment dial for the stitch length control to "6".
z Loosen screw 5.
z Remove washer 14.
z Remove bolt 11.
z Remove the two screws 114 of bobbin case position finger 113.
z Place bobbin case position finger 113 and the leaf spring aside.
z Loosen the two screws 108 on the sewing hook (fig. 112).
z Remove the entire sewing hook 107 to the top.
z Remove the entire connecting bar 10 from actuating crank 39 (fig. 111).
z Move connecting bar 10 as far as possible to the left.
z Push driving eccentric 33 to the left.
z Knock out hollow pin 161 (fig. 110).
z Remove the circlip with a screwdriver.
z Push the plastic washer a little to the left.
z Remove screw 112 of the lifting eccentric (fig. 111).
z Loosen the three screws 44 of the lower belt sprocket (fig. 110).
z Move hook driving shaft 45 fully to the right.
z Remove set screw 160 at the sewing hook bearing and push the latter fully to the left (fig. 111).
z Turn the sewing hook bearing a little and remove the small hook driving shaft along with the small
bevel gear 111.
z Remove screw 110 at the sewing hook bearing and remove hook shaft bushing 109 (fig. 112).
z Remove the large bevel gear with the lifting eccentric from the hook shaft.
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