Short Cover Hook
Cross Section Double Seam Defects - Cause & Remedy
Short Cover Hook
Probable Cause Suggested Remedy
Loose 1st Operation Seaming Roll setting. Make adjustments. See Parts List Instructions or Service Manual for procedures
Deep countersink, or excess metal used in countersink limits the amount of metal available for cover hook See the section on 'Deep Countersinks' in the next section
Loose 2nd Operation Seaming Roll Setting Make adjustments. See Parts List Instructions or Service Manual for procedures
Worn 1st Operation Seaming Roll groove profile Replace 1st Operation Seaming Roll
1st Operation Seaming Roll groove too wide Replace 1st Operation Seaming Roll with a Roll having a more narrow groove profile
Insufficient seaming stock caused by too small a cut edge diameter in making of cover Discuss with Cover Manufacturer
Excessive Lower Chuck Spring pressure Reduce spring pressure in Lower Chuck Assemblies. See the section on Long Body Hooks.
Worn 1st Operation Seaming Roll Bearings or Roll Pin Replace worn tapered roller bearing or Seaming Roll Pin. Make adjustments. See Parts List Instructions or Service Manual procedures
Worn Seamer Lever Shaft upper and/or Lower Turret Bushings. Check Service Manual for allowable tolerances and replace Bushings if beyond these limits