Richard Wasnock Report post Posted September 24, 2014 I bought a Cobra Class 4 and it won't sew anything, it hits pretty much any material, then the belt slides. I've lowered the disk bellow the table as far down as it will go, and it still seems like it's very easy to put the belt on. Steve is troubleshooting with me through email but I'm wondering if anyone else has any ideas? Quote Share this post Link to post Share on other sites
Greystone Report post Posted September 24, 2014 check the top pulley/hand wheel on top to make sure its tight also the pulley on motor Quote Share this post Link to post Share on other sites
Richard Wasnock Report post Posted September 24, 2014 Doesn't seem tight to me (the belt) so that's the issue I'm having.... and there's no way to make it tighter, it's at it's max distance. Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted September 24, 2014 Check the label on the long belt to see its "size." The legend may begin with 3L, which is the width designation. This may be followed by a dual number, like 58, 59, 60, etc. That is the circumference of the inside of the belt. Your machine has a speed reducer system that mounts on a square steel block. It can be moved up and down by loosening the one bolt facing the outside right on that post. The belt feeding up to the machine is usually placed around the smallest pulley on the reducer. If you have already lowered the reducer as far down as it can go and the belt slips on the smallest pulley, order a belt one inch (size) shorter. When it arrives, loosen the bolt, remove the old belt and install the new one. Then set it for no more than 1/2 inch deflection if the middle and tighten it down. The shorter belt goes from the motor pulley to the large wheel on the reducer. You can adjust the motor position to tighten that belt for minimal deflection. I usually spray belt no-slip on my sewing machine belts. This lets you run them a little looser than a dry belt. Looser belts translate into longer life for the interconnected components and their bearings. Quote Share this post Link to post Share on other sites
Slinger Report post Posted September 24, 2014 Call Cobra Steve. He will talk you through your problem rather than you pulling out your hair in frustration. Quote Share this post Link to post Share on other sites
Troy Burch Report post Posted September 24, 2014 When I maxed out the adjustment on my 205 Adler I took the belt off removed the staple where the belt was spliced together cut off about 1 1/2 inches put the staple back in place put the belt back on, took about 15 minutes and problem solved. I don't know much about sewing machines or if this can be done to yours but thats the way the belt was put together with the staple laying down in a groove when I got the machine. Quote Share this post Link to post Share on other sites
silverbullet Report post Posted September 24, 2014 The cobra uses a v belt no round belt on those to much torque on the machine to use a round belt and link . Quote Share this post Link to post Share on other sites
Troy Burch Report post Posted September 25, 2014 The cobra uses a v belt no round belt on those to much torque on the machine to use a round belt and link . my 205 adler has a v belt with a link. Does the cobra 4 have more torque? Quote Share this post Link to post Share on other sites
Richard Wasnock Report post Posted September 25, 2014 Ends up Steve and I weren't on the same page with what I bought. I had the EPS on mine, needed my belt on a different wheel. Quote Share this post Link to post Share on other sites
