4.11
76347-282 • 12- 08
WARNING
Sharp edges and flying debris
may cause serious injury.
Always wear protective gloves
and goggles while maintaining
the chipper knives.
3. Remove the drum lock pin and rotate the chipper drum to the next knife.
Re-insert the drum lock pin. Repeat steps 1 & 2.
4. If there is no need to turn, sharpen, or replace a knife then close the
chipper hood and put the hood locking pin back in place.
Knife with sharp
blade and square
edges
Knife with chipped
blade and rounded
edges
Figure 4.6
Inspect the knife assembly:
1. Check that the corners of the knife are square and the edge is sharp.
Remove the knife if sharpening or replacement is needed.
2. Check that the torque on the knife bolts is 375 ft/lbs. Retorque if
necessary.
Figure 4.7
Knife
Knife holder
Knife pocket
To Turn or Replace the Knives:
1. Remove the four knife bolts.
2. Clean debris from the knife and knife pocket with a wire brush.
3. Inspect the knife holder, knife bolt, and threads for wear or damage.
Note: If the knife holder face has a groove worn more than a 1/4” from
the leading edge it must be replaced.
4. When replacing the knife apply anti seize lubricant to each bolt before
assembly and torque to 375 ft/lbs.
5. Each knife is double-edged and may be turned when one knife edge
Knife bolts
General Maintenance • Chipper Knives
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