SPROCKET NOSE BAR PROBLEMS Blue Discoloration on Bar Nose
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.
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. Replace nose of RSN bar.
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.
Remedy Replace bar nose assembly..
BASIC GUIDE BAR MAINTENANCE TASKS
Chain Tension Inspect before use and after every hour of use.
File Bar Edge File bar edge to 90° weekly.
Chain and Bar Oil Turn nose sprocket while pumping grease until whole sprocket has new grease. Do not push dirt into hole.
Bar Cleaning Clean bar channel, grease hole and, oil hole daily.
Chaîne désalignée
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.
Orifice de lubrification
Dégagement
Chain and Bar Oil Inspect before use and after every hour of use.
Aucun dégagement
Chain Lean With chain on the bar, hold a straight-edge 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 straight-edge is flush with bar body. Replace bar if groove is worn. Check weekly.