26 DR
®
PRO XL520 CHIPPER SHREDDER
Knife Sharpening
• You should never attempt to sharpen the Chipper Knife freehand; take the Knife to a machine shop for proper
sharpening.
• It is extremely important to consistently maintain the 45-degree angle for proper performance.
• Excessive heat generated during the sharpening process will damage Knives and weaken the metal.
• How many times a Knife can be sharpened is determined by how much material needs to be taken off to sharpen or to
compensate for dents or gouges.
• A new Chipper Knife has a 5/16" measurement between the short side bevel edge and the Knife mounting holes (Figure
37).
• The Knife should never be sharpened to the extent that more than 3/32" is taken off this measurement.
• Once this measurement is below 7/32" (Figure 38), or if you are unable to remove dents or gouges with these
guidelines, replace the Knife.
Adjusting the Shredder Hammers
When the hard steel Hammers of the Rotor Assembly become dull or rounded
on the cutting edge, they may be rotated (side to side) or reversed (end to
end), to expose a new cutting edge (Figure 39).
Note: The Hammers have four cutting edges that may be used before replacement
is necessary. To rotate or reverse the Hammers, proceed as follows:
NOTICE: Do not reuse Flange Nut that you remove from the Hammer Shaft
during this procedure. Order new hardware from DR Power Equipment for
replacement. Damage may occur if used hardware is installed.
Before performing any maintenance procedure or inspection, stop the
Engine, wait five minutes to allow all parts to cool. Disconnect the Spark
Plug Wire, keeping it away from the Spark Plug
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