Troubleshooting - Caps aren't fully tightening


A broken main spring (C011) in the capper head.

This spring breaks when the capper head is set to low. That can be tested without taking the machine apart. Set the spindle shaft in the lowest position. Place your hands under the clutch housing and lift up. If it moves up and down easily (about 1 inch), then the C011 spring is most likely broken. Other broken components in the head assembly can give the same test results.

The clutch cone itself has gotten too much oil or grease on it. Wipe off the clutch cone (C016) and the interior of the clutch cup (C017) and reassemble. There should be grease on the Spring (C018), the pins (C082) and the bearing (C065).

The insert material is not matched to the cap.

Swan-Matic offers 5 different types of material that inserts are made from. Refer to the Inserts and Driver Shells page for an explanation of each type if insert.  To get the best match, send in 12 caps, 2 containers and your contact information to:

 Swan-Matic Test Lab                                                                                             

7050 West Ridge Rd.                                                                                             Fairview, PA 16415                                                                                         

The insert has worn down.

As the insert wears, the pressure on the cap is reduced because the distance from the insert to the cap increases. To correct it, just move the head of the capper down slightly or install a new insert.

Capper head is set to low.

If the capper is pressing too hard on the container being capped, it can cause the threads of the container to bind with the cap threads. 

The insert is slipping inside the driver shell.

Clean the driver shell out and replace the insert.

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  • Greg Szuba