Drive Sprocket
93 Mechanical Timber Harvesting Handbook
Drive Sprocket Types
Drive sprockets transfer power from your machine to your saw
chain to drive it around your guide bar. Drive sprockets are the
third member of your saw chain-based cutting system. They
will wear as a team and should be inspected and maintained as
a team.
Type Advantages Disadvantages
Rim
• Best saw chain support
for cutters and tie-
straps.
• Setup is
important:
the rim must
be properly
aligned with
guide bar*
*Check the alignment of your rim drive sprocket regularly and
use shims to adjust the rim’s position into correct alignment. See
pages 95 for more information on drive sprocket alignment.
HarvesterLok®
Rim
• Uniform pressure
eliminates distortion,
warping.
• Fittings for smaller
shafts.
• Keyless hub.
• Hex-head set screws
for quick installation,
adjustment, and
removal in the field.
• No space between the
drive sprocket and shaft
gives zero backlash.
• Drive sprocket
must be
aligned to the
drive shaft
to prevent
damage to
the saw chain,
guide bar and
drive sprocket.
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