4.10 76347-282 • 12- 08
Chipper Knives
DANGER
A rotating chipper drum can pinch body parts, entangle
loose clothing, jewelry, and long hair which will result in
cuts, mutilation, serious injury, or death. Before initiating
maintenance throttle the engine down and shut the engine
OFF. Wait for the chipper drum to completely stop rotating
and insert the drum lock pin.
The chipper drum will coast for several minutes after the
machine is shut off. Do not open the chipper hood until the
drum rotation has completely stopped. Serious injury,
mutilation, or death will occur.
Debris may be projected during the maintenance of the
chipper knives and result in eye injury, skin punctures, and
cuts. Always wear protective equipment and gear such as
goggles and work gloves.
NOTE
Excessive heat, indicated by discoloration of the knife edge, will lead to
microscopic cracks that can cause the knife to break when it is put back
into service. Do not use knives that have been exposed to excessive heat
from sharpening.
To ensure maximum efficiency of the chipping operation the chipper knives
must be properly maintained. The time between sharpening or replacement
will depend on the type of wood and operating conditions. Indication of dull
knives include poor quality, excessive oversize chips, and poor feed
characteristics. Always maintain proper knife sharpness. It is important to
follow these guidelines to ensure efficient chipping:
• Use original Morbark Inc. knives with the correct steel composition and
hardness. Immediately replace worn knives
• Keep the knife edge sharp and anvil square. Use matched sets
• Maintain the proper clearance between the chipper knife and anvil
• Use the correct hardware to mount the knife to the holder and maintain
the correct torque to the bolt. Keep the knife pocket and holder clean
and free of debris
1. Place the safety control bar into the neutral position.
2. Throttle the engine down.
3. When the engine has reached an idle, disengage the clutch.
4. Turn the ignition OFF and lockout the machine.
5. Slide back the chipper hood locking pins and open the chipper hood.
Before inspecting or maintaining the chipper knives:
6. Slowly rotate the chipper drum by hand so the first knife is accessible.
Important: Keep loose clothing, jewelry, long hair, and body parts
away from rotating parts!
7. Insert the chipper drum locking pin.
General Maintenance • Chipper Knives
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