DR Power Chipper - Manual (Page 21)

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3. Rotate the Flywheel using a long stick until the three countersunk Allen
Screws and Locknuts attaching the Knife to the Flywheel are visible through
the Access Openings (Figure 37).
4. Clean out the heads of the Allen Screws with an Awl or Sharp Tool.
5. Insert a 3/16” Allen Wrench into the head of a screw.
6. While holding the Allen Wrench, remove the Locknut using a 1/2" socket.
7. Repeat Steps 5 and 6 for the remaining two Allen Screws.
8. Remove the dull or damaged Knife and visually inspect the Flywheel Slot and
Knife mounting area and be sure they are clean and that the replacement
Knife will be able to mount flush against the Flywheel.
9. Install a new or sharpened Knife as shown (Figure 37) with the Knife edge facing up and towards you and finger tighten the
Allen screws and Locknuts (use the new hardware supplied with a new Knife kit) to hold the Knife to the Flywheel.
10. Using a 3/16” Allen wrench and a 1/2” socket, tighten the center Screw and Locknut, tighten the outer Screw and Locknut,
then tighten the inner Screw and Locknut.
11. Double-check that all three Locknuts on the Allen Screws are tight.
12. Reinstall the two Access Covers.
13. Replace the Belt Guard.
14. Check and if needed adjust the gap between the Knife and Wear Plate (See “ Checking and Adjusting the Knife to Wear
Plate Gap ” in this Chapter).
Removing and Replacing the Wear Plate
Tools Needed:
 7/16" wrench
1. Remove the Hopper (See “ Inspecting the Chipper Knife and Wear Plate ”
in this Chapter).
2. Use a 7/16" wrench to remove the three Locknuts and Carriage Bolts that
attach the Wear Plate to the Chipper Assembly and then remove the Wear
Plate (Figure 38).
3. Install the new Wear Plate and secure with the Carriage Bolts and Locknuts.
NOTE: The Gap between the Knife and Wear Plate must be adjusted whenever the
Wear Plate is removed. See the following instructions.
Checking and Adjusting the Knife to Wear Plate Gap
When you replace the Knife or Wear Plate, you must check and set the clearance between the Knife and Wear Plate. Set this
clearance or gap to 1/16" by using the Gap Tool that is supplied with the Chipper and with a new Knife Kit. If the gap between the
Wear Plate and the Knife is not set correctly, you will have excessive vibration when chipping and the Knife will seem to be dull.
The Wear Plate should have a square edge and be free of dents or gouges. The Wear Plate can be hand sharpened (see steps
below). Be careful not to overheat it during the sharpening process. This will change the characteristics of the steel and you will
then have to replace the Wear Plate (see “Wear Plate Sharpening” in this chapter).
Chipper
Knife
Figure 38
Wear
Plate
Carriage Bolt
and Locknut
Chipper Knife
(sharp edge facing up and
towards you)
Figure 37
Countersunk
Allen Screws and
Locknuts
Flywheel
Slot
If the flywheel surface is not cleaned properly and the chipper knife is not mounted flush on the flywheel, the knife could crack
when the hardware is tightened.