Pfaff 1540 User Manual
Page 86
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.