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37. Changing the lower stepping motor
Note:
The feed stepping motor is only exchanged complete.
Removal:
• Remove the machine’s power plug.
• Remove the detachable work support.
• Remove the housing according to the service manual.
• Remove tension spring 3 (fig. 88).
• Unscrew and remove fastening screw 4.
• Remove clamping plate 21.
• Turn the handwheel until the lobe of feed eccentric 5 is positioned at the rear.
• Fold feed regulator 6 downwards and remove this and link 7 from the connecting bar rod to the left.
• Remove slide block 8 with the spring to the right.
• Unscrew and remove both screws 15 of the stepping motor.
• Remove the complete stepping motor 17.
Fitting:
• Insert feed stepping motor 17 complete with the bracket.
• Insert and slightly tighten upper fastening screw 15.
• Insert and slightly tighten clamp spring 144 with the lower screw 15.
• Push slide block 8 with spring onto the bolt and set it in the guide slot in the correct curve radius.
• Check that the slide block moves freely, but without play or binding, in the guide slot.
• Push guide lever 16 complete with stepping motor 17 carefully to the left, until there is a clearance of
0.05 mm between the slide block 8 and the connecting bar 19.
• Tighten screws 15 and check that the slide block moves freely, but without play.
• Push link 7 complete with feed regulator 6 to the right onto the connecting bar pin.
• Insert fastening screw 4 in clamping plate 21 and tighten it a little.
• Shift fulcrum stud 20 laterally so that link 7 and connecting bar 19 still have a slight play and can
move freely.
• Tighten screw 4.
• Attach tension spring 3.
• Mount the housing according to the service manual.
• After a running-in time of 10 - 15 min. check the adjustment of equal forward and reverse stitch length
according to section 22 of this service manual.
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