GUIDE BAR NOSE CONDITIONS
6. BLUE DISCOLORATION ON BAR NOSE Symptoms : Entire edge turns blue or only in one or two spots. Rails wear quickly. Saw chain drive link damage. Cause : Nose was pinched. Friction from revolving sprocket caused heat and area turned blue. Could be lack of lubrication. Remedy : Replace guide bar and saw chain. 7. SPREAD NOSE RAILS AND BEARING LOSS Symptoms : Spread nose rails and loss of bearings. Sprocket breakage. Cause : Chain jumped off bar. Carving with nose. Limb caught nose. Twisting nose. Any operating accident. Remedy : Replace bar or replace nose of RSN bar. Replace sprocket components. Keep guide bar nose away from objects not intended for cutting.
9. SECTION BROKEN OUT OF SPROCKET Symptoms : Open nose. Broken sprocket. Bearings fall out. One or two broken teeth. Cause : Irregular operating condition which forced drive link sideways. Throwing the chain when limbing. Chain tension run too loose. Remedy : Replace bar nose assembly. 10. NOSE BURNED AT TIP (HARVESTER) Symptoms : Nose breakage from bearings wearing quickly and jamming. Cause : High saw chain tension from automatic saw chain tensioners. Remedy : Decrease the tension applied by automatic saw chain tensioner.
8. CHIPPING AT NOSE CONNECTION
11. LOOSE OR MISSING NOSE/ATTACHMENT RIVETS
(REPLACEABLE NOSE) Symptoms : Chipping at connection of both body and nose assembly. Cause : Loose chain tension. Continual pressure in this area. Heavy limbing at this point. Remedy : Replace nose assembly and dress rail of bar and nose to match.
Symptoms : Rivets continue to loosen until laminates spread and bearings are lost. Cause : Guide bar tip flexing during operation from difficulty cutting or accidents. Remedy : Check rivets every 100 machine hours. Re-hammer loose rivets and replace rivets if rivet head is missing. Always use new rivets.
Technical Informations
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