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DR  COMMERICAL LEAF and LAWN VACUUM Safety & Operating Instructions 39
Figure 46
Removing and Replacing the Chipper Blade
Tools Needed:
(2) 1/2" wrench or socket
9/16" wrench or socket
3/16" Allen wrench
1. Disconnect the Blower Exit Elbow
Assembly from the Collector Box Hose
(Figure 44).
2. Remove the Wing Nuts and Wing Screws to
disconnect the Inlet Hose Adapter and
Blower Exit Elbow Assembly from the
Chipper/Blower unit (Figure 45).
3. Using two (2) 1/2" wrenches or sockets,
remove the 12 Bolts & Nuts retaining the
Blower Cover Plate (Figure 45) and remove
the plate from the blower housing. The
Chipper Impeller is now exposed.
4. Using the 9/16" wrench or socket, remove
the Chipper Impeller retaining bolt from the
engine shaft and slide the impeller off of the
shaft (Figure 46). Be sure to save the key in
the slotted shaft.
5. The Chipper Blade is attached to the
impeller with three (3) Allen head screws
and three (3) nylon lock nuts (Figure 46).
Using the 3/16" Allen wrench and 1/2"
wrench, remove the old Chipper Blade by
removing the three (3) screws and nuts.
Note: Carefully observe the orientation of the
Chipper Blade edge and mounting
holes when removing the blade.
6. Install the new Chipper Blade and Impeller
in the reverse order making sure the key is
installed in the engine shaft keyway.
Note:
If the Safety Interlock Switch is not engaged, adjust the switch mounting bracket by
loosening the bracket bolt and sliding the bracket up so that the button on the switch
is fully depressed against the Blower Exit Elbow Assembly. See page 16.
WARNING! Before performing any maintenance procedure, stop the engine
and disconnect the spark plug wire.
Figure 45
Nylon
Nut
Chipper Blade Allen
Head
Screw
Chipper
Impeller
WARNING! Do not attempt to re-sharpen the chipper blade. This will
unbalance the impeller and may damage the engine and blower.
Always replace a dull or damaged chipper blade with a new blade.
Bolt
Blower Exit
Elbow
Assembly Wing
Screw
4-pls.
Inlet
Hose
Adapter
Bolt &
Nut
12-pls.
Blower
Cover
Plate
Wing
Nut
4-pls.
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