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Troubleshooting & Repair
Chipping Knives Sharpening and
Replacement
The chipping knives should be sharpened or replaced
when tree limbs require extra force to feed into the
chipper cone.
The chipping knives may be resharpened at a 30 degree
angle until the distance between the edge of the blade
bevel and the mounting hole is less than 1/16” (1,6mm)
(see Figure 17).
To inspect, sharpen, or replace the chipping knives:
1. Turn the engine off and wait for all moving parts to
stop.
2. Disconnect the spark plug wire and secure it away
from the spark plug.
3. Detach the shredder hopper from the rotator housing
(see Figure 12).
4. Remove the rotator cover by removing the hardware
that secures it to the main housing (see Figure 13).
5. Remove the chipper cone base (Figure 15).
6. Rotate the rotor assembly so that the socket head
capscrews that secure one of the chipper knives can
be accessed through the rotor cover and access hole
(Figure 16).
7. Using a 1/4” hex wrench, loosen and remove the two
socket head capscrews and chipper knife.
8. Inspect, rotate, sharpen, or replace the chipper knife.
9. Reinstall the chipper knife and tighten the socket
head capscrews to 18-20 ft. lbs (24-27 N.m.).
10. Rotate the rotor 180 degrees and repeat with the
other chipper knife. Reinstall the rotator cover and
shredder hopper when completed.
WARNING
Amputation hazard. To avoid serious injury from
accidental starting, always disconnect the spark
plug wire and secure it away from the spark plug
when servicing the unit.
WARNING
Cutting hazard. To avoid serious injury, avoid
contacting the sharp cutting edges of the chipping
knives.
Figure 16. Access Hole
A. Access Hole
A
1/16”
Min
30°
Top View Side View
Figure 17. Chipper Knife Minimum Cutting Edge
Figure 15. Installing the Chipper Cone