For technical shop application and experiences persons only: Generally, the problem will be a bearing seizure on one of the eccentric and lifting rings of one of the loopers on the main-shaft. However, you should always check for any blockages like looper timing and knife mechanism issues first, etc. To repair the problem:
Remove the threads and thread stand from the back of the machine in order to set the machine upside down.
Remove the bottom cover by removing the four base plate screws.
Add drops mineral spirits to each of the eccentric on the main shaft, one at a time, while trying to turn the handwheel. Repeat this process per eccentric so as to determine which eccentric has the dry problem.
Once the machine begins to loosen up, you can run the machine while adding a small amounts of solvent that will wash out any varnishing. Do this when the machine is laid on its back so as not to get fingers etc, in the moving parts!!!
Blow out with compressed air until mostly dry. Use safety glasses and ear muffs for safety sake.
Add a class 68 machine oil to each eccentric as well as the cam and fork of the top knife arm.
Run for a while until you are satisfied the the tightness is totally gone, then reassemble.
Note: In order to run the machine, the safety switch will have to be closed by some means of depressing the safety switch cable end, found on the lower left of the swing table. **Do not place fingers on or near the open moving parts as serious injury is possible!!
Remove the needle plate and clean the feed dogs. You'll want to examine the looper positions to insure they're not at risk. Oil all the bushings. If this doesn't solve your problem, take it to your local dealer for service.
Answers & Comments
For technical shop application and experiences persons only:
Generally, the problem will be a bearing seizure on one of the eccentric and lifting rings of one of the loopers on the main-shaft. However, you should always check for any blockages like looper timing and knife mechanism issues first, etc.
To repair the problem:
Note: In order to run the machine, the safety switch will have to be closed by some means of depressing the safety switch cable end, found on the lower left of the swing table.
**Do not place fingers on or near the open moving parts as serious injury is possible!!
Remove the needle plate and clean the feed dogs. You'll want to examine the looper positions to insure they're not at risk. Oil all the bushings. If this doesn't solve your problem, take it to your local dealer for service.