Oregon Maintenance and Safety Manual, MMANUAL-EN AB

Guide Bar Troubleshooting

13. Nose burned at tip from saw chain sliding on rails of sprocket nose guide bar, or from the sprocket being recessed into the tip. Cause: High saw chain tension from automatic saw chain tensioners. Symptoms: Nose breakage from bearings wearing quickly and jamming. Remedy: Decrease the tension applied by automatic saw chain tensioner. 14. Loose or missing nose/ attachment rivets. Cause: Guide bar tip flexing during operation from difficult cutting conditions or accidents. Symptoms: Rivets continue to loosen until laminates spread and bearings are lost. Remedy: Check rivets every 100 machine hours. Rehammer loose rivets and replace rivets if rivet head is missing. Always use new rivets.

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Safety & Maintenance Manual

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