DR Power 18 HP (June 2004 - Present) - Manual (Page 21)

REMOVAL, SHARPENING AND RE-INSTALLATION OF CHIPPER KNIFE
HOW TO REMOVE THE KNIFE
• Stop the engine.
• Remove spark plug wire(s) and keep away from spark plug(s).
• Disconnect battery at negative terminal.
• Open the access cover on the chipper basic machine.
• Rotate the chipper disk until the three countersunk screws attaching the knife to the flywheel are visible
through the access door.
• Clean out the heads of the allen screws with an awl or sharp tool.
• Insert a 3/16” allen wrench into the heads of the screws.
• While applying pressure with the allen wrench, apply heat from a propane torch to the screws to break
loose the Loctite on the screws.
• Remove the heat once the screws have loosened.
• Remove all three allen screws in this manner.
KNIFE SHARPENING
• You should never attempt to sharpen the chipper knife (or knives) freehand.
• It is extremely important that the 45 degree angle be maintained consistently for proper performance.
• The chipper knife (or knives) should be taken to a machine shop for proper sharpening.
• Excessive heat generated during the sharpening process will damage knives and weaken the metal. Be
sure the knife is not overheated.
KNIFE INFORMATION
• The chipper knife should be checked routinely for sharpness.
• Using a dull knife will decrease performance and cause excessive vibration that will cause damage to the
shredder/chipper.
• 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 5/16” measurement between the short side bevel edge and the knife mounting
holes. See figure 2.
SHORT SIDE BEVEL EDGE
KNIFE MOUNT HOLE
NEW KNIFE
Figure 2
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