Guide Bars – Troubleshooting
Guide Bar Problems
Chipped rail
Thin rail and low rail
Cause Chipping of rails behind hard tip. Continual pressure of bar on one area. Dull chain. Loose bar tension Result Material chipping out of one or both rails behind the hard tip Solution Reverse bar to reduce wear. Replace bar. (This chipping can cause chain damage)
Cause Chain leaning over, cutting crooked. Forcing dull chain to cut. Damage to cutters on one side of chain Result Thin rail on one or both sides of bar. Rail could be blue color in thin area Solution Bar cannot be repaired if rail is thin and uneven. Replace it. Make sure chain doesn’t continue to lean. If it does, replace with a new chain
3
Worn bar rails
Wire edge bar rail
Cause Worn bar rails are normal for a bar that has been in service for a period of time Result Shallow groove Solution Replace bar
Cause Normal wear caused by pressure of chain on edges of bar rails Result Rail edges may chip if wire edge is not removed Solution Use a flat file on edge of bar rail to remove wire edge or Bar Rail Dresser #111439
Sprocket Nose Bar Problems
Blue discoloration on bar nose
Spread nose rails and bearing loss
Cause Nose was pinched. Friction from revolving sprocket caused heat and area turned blue. Could be lack of lubrication Result Entire edge turns blue or only in one or two spots Solution If this happens in the nose bearing area the bar is no longer service- able. Replace bar if laminated bar
Cause Chain jumped off bar. Carving with nose. Limb caught nose. Twisting nose. Any operating accident Result Spread nose rails and loss of bearings Solution Replace bar or replace nose of RSN bar
Guide Bars – Troubleshooting
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