Oregon Maintenance and Safety Manual, MMANUAL-EN AB

Replace Nose Sprocket

4. Inside the nose sprocket package, you’ll find the new sprocket wrapped in a tissue. Be careful to keep the sprocket inside the tissue as you remove it from the package — bearings are easily lost. Slide the tissue and the new sprocket, together, into the guide bar’s nose.

5. Once fully inside the nose, hold the nose sprocket in place, then remove the tissue.

6. Align the sprocket’s inner race holes with the holes in the guide bar nose. Insert rivets into each hole through the guide bar. On used guide bars the nose rails could be spread apart. Use a small

clamp to hold the nose rails together when inserting and securing the rivets.

7. With the guide bar and rivets solidly supported on a strong, flat metal surface, carefully peen the rivet heads down with the flat end of a hammer. Be careful to hit only the rivet head. Do not hit the guide bar body — this will pinch the nose sprocket. Rivet heads must be snug and secure while still allowing the drive sprocket to turn freely.


Safety & Maintenance Manual

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