Juki 8300N I purchased this machine about a week ago and am pulling my hair out!! It works fine for a little while, and then when it comes over a seam (denim OR light cotton) or for just no reason at all, the thread gets cut or unthreaded, etc, it's no longer in the eye of the needle. Help would be SO appreciated, thanks!!

Hi there, sorry, but the 8300n is just a straight stitch.

Dear Rosemarie,

Make sure you have threaded the machine from right to left, it sounds like the needle thread is trapped under the lower looper thread and cannot form a stitch.........start the threading over from scratch like this:

1. Lower Looper
2. Upper Looper
3. Left Needle
4. Right Needle

Is there a diagram for how to thread on the inside of the door ?

Follow that slowly and carefully to make sure you have not missed any thread guides on the way, as each one needs to be followed through to ensure correct tension and thread progression.

Cheerup and Be Happy always

Some machines have a lever or switch that disengages the feed dogs for lightweight or fragile fabrics.

Perhaps this will help:

File JUKI DDL 8300N Instruction Manual pdf

..

Perhaps a manual would be helpful:

File JUKI DDL 8300N Instruction Manual pdf

You should probably contact the manufacturer with questions. Hopefully, you did some thorough research before purchasing this machine. From the info I found, it appears to be a straight stitch only machine. I don't know anything about this machine, but I would be hesitant to purchase a straight stitch machine for sewing swimwear. Usually, swimwear needs a stretch stitch or zig-zag capability. Just my thoughts...

Amazon com Juki DDL 8700 Industrial Straight Stitch Sewing Machine Arts...

Juki DDL 8300N Industrial Single Needle Lockstitch Sewing Machine with...

JUKI DDL 8300N Straight Stitch Industrial Sewing Machine With Table Lamp...

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Your needle probably bent and got jammed. clip threads top and bottom of the fabric and remove... then get in the bobbin area and look for issues.

contact a juki dealer & ask them about the lever

i was able to find it at www.ifixmachines.com

Might I be so bold as to disagree with Allmakes.
Why would a manufacturer build different models of industrial. They are designed for differnt jobs. The 8300 is a high speed garment machine, the 1541 is a compund feed upholstery machine. The motor is the same HP and does not affect the ability to sew heavy. The garment machine will sew garment weight leather just fine but you will have problems getting the fabric to feed properly particularly over seams. The other issure you may find with a garment machine is it's ability to handle heavier threads. I suggest that the 1541 would be a better choice for making bags and purses.