DR Power Walk-Behind 11.50 fpt (August 2010 - Present) - Manual (Page 19)

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5. Remove the two Nuts from the Hopper Studs (Figure 26).
6. Hold the Bolt Head inside the Housing in place with a 1/2" Wrench or
locking Pliers as you remove the Low Profile Locknut (Hopper side) and
Hopper together. The Bolt can be left in the Housing.
7. Rotate the Flywheel so the Knife hardware can be accessed from the oval
cutout you removed the Hopper from.
8. Use a 3/16" Allen Wrench (Hopper side) and a 1/2" Wrench (Flywheel side)
to remove the Knife from the Flywheel.
9. Replace or sharpen knife.
NOTE: Make certain knife is reassembled with the sharp edge toward the slotted
opening in the impeller assembly.
10. Reassemble the machine in the reverse order.
Sharpening the Chipper Blade

Over a period of time, the cutting edge on the chipper cutting knife will dull.
The cutting knife must be sharpened or replaced in order to restore
performance.

Sharpen a chipper knife that is dull or that has only small minor nicks. The
knife is made from tempered tool steel and is extremely hard - do not attempt
to sharpen with a hand file. We recommend that you take the knife to a
professional sharpening service or machine shop for proper sharpening. All
grinding must be done flat and uniform along the edge. Care must be taken
to maintain the same angle on the cutting edge (Figure 27).

Do not reuse a knife that has been sharpened more than 1/8 inch. The
removal of this material could affect the balance of the rotor assembly. The
rotor assembly will vibrate excessively if it becomes unbalanced.
Bag Maintenance
Keep the bag clean by occasionally washing it by hand with mild soap and water.
A clean bag improves air flow and results in better vacuuming performance. Do
not wash the bag in an automatic washer. Do not use a cleaner which contains
bleach. Allow the bag to dry thoroughly before storing.
Replacing the Belt
1. The Belt can first be pulled from the larger bottom Pulley and then from the
smaller top Pulley (Figure 28).
NOTE: The Belt Guide will spring away from the top Pulley to allow removal, but
you will need to pull it away a bit for Belt installation. The two Belt Guide
arms bust be on the flat side (outside) of the Belt.
Hopper
Bolt and
Locknut
Figure 26
Flywheel
Flat Head
Screw and
Locknut
Hopper
Large Bottom
Pulley
Figure 28
Small
Top
Pulley
Belt
Belt Guide
Figure 27
Discard a cracked or severely nicked knife because it could break apart and
damage the machine and cause personal injury.