Troubleshooting Drive Sprockets - Oregon Harvester Handbook

Drive Sprockets Troubleshooting
When to Replace Your Drive Sprocket
Regardless of pitch or design, harvester drive sprockets should be
replaced when damage is observed .
.404"-Pitch Drive Sprockets
Rims should be replaced when the depth of the wear on the
surface of the rim reaches 0 .025" (0 .635 mm) .
3/4"-Pitch Drive Sprockets
Rims and the HarvesterLok rims should be replaced when
the depth of the wear on the surface of the rim reaches 0 .025"
(0 .635 mm) .
The Drive Sprocket is the third component of your cutting system;
regular inspection and maintenance is critical . Damaged, misused,
or worn harvester drive sprockets will damage and shorten the life
of operation of your entire system . Damaged, misused, or worn
harvester drive sprockets cannot be repaired; they can only be
replaced .
NOTE: A new saw chain can be ruined if installed on a worn rim
or spur drive sprocket.
Check the wear on your rim or spur drive sprocket daily, and
before each session of use . If worn, replace the drive sprocket
before installing a new saw chain . Here are the things you should
look for, and the corrective actions you should take:
97
Worn rim drive sprocket
Cause: Used beyond service life causing
excessive wear on outer and inner
surfaces of rim drive sprocket .
Symptoms: Saw chain breakage . Drive
link wear, breakage .
Remedy: Replace rim drive sprocket
Mechanical Timber Harvesting Handbook