Remove plate and place one drop of Zoom Sewing Machine Oil at the bottom left-hand side of race shuttle (you have to remove the plastic section - just unsrcrew with the flat silver thingy in your 4423 accessories. Don't get oil on plastic parts. Remove screws underneath of machine. Tip machine on it's side against a towel. Run machine slowly. Any moving part gets just one drop of oil and gears that look dry get Singer lubricant (Comes in a tube). Make sure you tighten screws, but don't tighten with too much force so you don't "strip" plastic. When sewing heavy fabrics, use Singer Style needles #2032/ 90/14 and 100/16. On TV they demonstrate heavy fabrics and knits with this "heavy duty" machine, I know, but you can bet, you need specific needles for specific jobs no matter if you have a home machine or even a metal industrial. Much success!
I would suggest that the words "heavy duty" applied to a machine sold for less than $150 is probably taking a little bit of artistic licence.
Grosgrain edging is very stiff so you will probably need at least a 100 size needle for this and they may well go blunt pretty quickly. This could be the squeaking noise, needles will "pop" and squeak if they are blunt. Change the needle and see if it stops.
I would suggest that if you are doing straight stitching in large volumes for commercial purposes, this is not the right machine, you need something like a Singer 20U industrial machine, a good workhorse which will do straight and zig zag stitches.
I have one of these with a 3/4 hp motor in a table and it is so strong, great for sewing tents, horse blankets etc. We used it for attaching vinyl to 1/2" foam for ride-on tractor seats, something it did really well. Different needle system to domestic machines and can sew heavier gauge thread too.
Sorry, this probably isn't what you wanted to hear about your new machine. Try changing the needle and see if it stops the squeaks. But you may need to reconsider your choice of machine.
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Is it a low shank type machine?
Replace the needle.
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