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 serviceable. Replace bar if laminated bar
Chipping at nose connection (replaceable nose)
Cause Loose chain tension. Continual pressure in this area. Heavy limbing at this point
Result Chipping at connection of both body and nose assembly
Solution Replace nose assembly and dress rail of bar and nose to match
Section broken out of sprocket
Cause Irregular operating condition which forced drive link sideways. Throwing the chain when limbing. Chain tension run too loose
Result Open nose. Broken sprocket. Bearings fall out. One or two broken teeth
Solution Replace bar nose assembly.
Spread nose rails and bearing loss
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
Basic Guide Bar Maintenance Tasks
Chain Tension Inspect before use and aer every hour of use
File Bar Edge File bar edge to 90° weekly or use Bar Rail Dresser #111439
Bar Nose Grease Turn nose sprocket while pumping grease until whole sprocket has new grease. Do not push dirt into hole
Bar Tip Clearance On sprocket nose bars, check for clearance around the bar tip between top of rails and the bottom of cutters or tie straps weekly. Replace nose sprockets before cutters or tie straps contact the bar rails
Bar Cleaning Clean bar channel, grease hole and, oil hole daily
Chain and Bar Oil Inspect before use and aer every hour of use
Chain Lean With chain on the bar, hold a straightedge against the bar body and against a cutter side plate. A good groove will hold the chain straight, leaving a small gap between the straight edge and bar body. A worn groove will let the chain lean until straightedge is flush with bar body. Replace bar if groove is worn. Check weekly