Oregon Harvester Handbook page 85

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 .
8 . Clean out the bar groove to ensure it is free of possible
debris .
Mechanical Timber Harvesting Handbook
Sprocket Nose Replacement: HS
80