Bernina 730 Record Cam Shaft Gear Replacement
Introduzione
Vai al passo 1Issue: sewing machine bogs down every 8-15 stitches.
Replace the broken/worn out gear on the stitch cam shaft.
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Open the top of the machine to expose the internal mechanism.
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It is easier to replace the gear without the top cover in place. Loosen the screw holding the cover arm on. Remove the pin and set aside for later.
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Remove the two screws holding the hinges. Set the cover aside.
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Remove the three screws holding the assembly down. In my case one of the screws was stuck and I had to use locking pliers to loosen it.
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Push the needle position indicator to the side to access the screw beneath it.
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Pull the assembly to the left and up. It should come out easily.
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The shaft is held in by the set screws on the gear hubs: 1 on the cam gear, 2 on the little pinion gear 90 degrees apart. Loosen them 3 turns or so with a jewelers screwdriver.
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Slide the pinion gear to the end of the shaft. Gently slide the shaft back with needle nose pliers. Catch the gear before it falls.
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Push the shaft out the back then finish pulling it out.
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Loosen the two screws holding the gear and cam assembly together so that the screws can come out. Keep the screws in the holes to keep everything together.
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Push the gear shaft with fingers or screwdriver to slide it out. It may require the use of two screwdrivers to pry out.
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Insert the new gear shaft into the cam assembly. Line up the holes and thread the screws in.
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The new gear I bought came with an Allen head set screw so I swapped the old flat head setscrew into the new shaft.
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Set the gear and cam assembly in the sewing machine.
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Slide the shaft in, small end first, until it just protrudes from bearing on the gear side.
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Hold the pinion gear in place and slide the shaft the remainder of the way into it.
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Tighten the set screws on the gears (there are 2 on the pinion).
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Slide the needle indicator in from the left. Push the stitch selector aside as needed.
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Install the three screws in reverse order that you removed them.
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Turn the machine manually at least one full turn to make sure everything is properly in it's place.
Turn the machine manually at least one full turn to make sure everything is properly in it's place.
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5 Commenti
I need to replace the timing belt inside my Morse FA-630 machine. I'm still hunting down parts for this ancient machine, but I'm going to fix it myself. Do you have any pointers or concerns I need to be aware of?
Do you do repairs?
Do you do repairs? I have a Bernina 1230 I was told was toast but feel it is worth refurbishing
No, I'm just a mechanic that likes fixing things. If the dedicated repair shop says it's toast then I'd go with their opinion.
I have a machine of almost the same quality, but the stitches do not work in it and the needle shaft also sticks out beyond the level of the foot. Please help me in repairing it.
