Oregon Maintenance and Safety Manual, MMANUAL-EN AB

Guide Bar Troubleshooting

Most guide bar problems occur in the guide bar rails, and are caused by four things: lack of lubrication, incorrect saw chain tension, and accidents or irregular operating techniques which pinch the rails or push the drive links sideways against the guide bar rails

Problem: Guide Bar Rail Conditions

1. Rails are worn down, groove becomes shallow. Cause: Normal wear on rails Symptoms: Chain rides on groove bottom causing drive link damage, chain leans during cutting Remedy: Guide bar is at end of life, replace guide bar If wear occurs too quickly, check for proper lubrication, chain sharpness, guide bar feed load 2. Outside edge of rails develop wire edges. Cause: Normal wear on rails Symptoms: Left alone, wire edges can break off and chip away rail material Remedy: Use flat file or grinder to square up guide bar’s rails and remove wire edges If wire edges develop too quickly, check for proper lubrication, saw chain sharpness and guide bar feed load Note: If using a grinding wheel, direct debris towards tail, then clean out grooves. Grinding debris can cause nose components to wear quickly or jam. 3. Rail on one side is worn thin. Cause: Damaged or dull cutters on one side (see saw chain section) Saw chain leaning over in a worn groove or using a 063" gauge saw chain in a 080" gauge guide bar Symptoms: Incomplete cuts, leading cuts, guide bar bound in the cut Remedy: Replace guide bar, check for correct saw chain gauge, replace saw chain if it continues to cut crooked after sharpening (see "How to Sharpen Cutters" on page 23)


Safety & Maintenance Manual

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