Oregon Maintenance and Safety Manual, MMANUAL-EN AB

Guide Bar Troubleshooting

4. Rails around tip of solid-nose guide bars show small cracks or broken-out sections. Cause: Accidents or irregular operating techniques, which push drive links sideways or place excessive pressure on the nose, can cause breaks or cracks. Symptoms: Damage to tie-straps and cutters, saw chain throws, short guide bar life. Remedy: Your dealer may be able to repair minor damage on a relatively new guide bar. 5. Rails around the tip of solid-nose guide bars are split at the bottom of the guide bar groove. Cause: Accidents or irregular operating techniques which push drive links sideways or place excessive pressure on side of nose can cause breaks or cracks. Symptoms: Rails spread and chain rides on groove bottom causing drive link damage and saw chain leans during cutting. Remedy: Your dealer may be able to repair minor damage on a relatively new guide bar. 6. Rails along the guide bar body or around the tip of sprocket nose guide bars show blue discoloration. Cause: Pinched rails, lack of lubrication, or accidents and improper cutting techniques. These actions can push drive links sideways in the groove, creating extreme friction-generated heat. Symptoms: Blue spots on rails indicate temperatures reaching 600° F (315° C) and rail softening. Rails wear quickly. Saw chain drive link damage. Remedy: Replace guide bar and saw chain.

Safety & Maintenance Manual

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