71020 & 70554 Chipper Shredder Owners Manual Page 15
5.4 SETTING CHIPPING BLADE
CLEARANCE
The chipping blades should clear the chipper block
located directly under the chipper chute by 1/16 inch to
1/8 inch. To adjust the blade clearance, proceed as
follows:
1. Remove the lower belt guard, discharge screen and
the access cover.
2. Loosen bushing bolts holding the pulley to the rotor
shaft on the front side.
3. Remove the cover cap on rotor shaft rear side.
4. Use a punch and hammer to tap the lock collars in a
direction opposite of normal rotation so that they
rotate and can be removed.
5. Using a rubber mallet, tap the end of the rotor shaft to
obtain 1/16 to 1/8 of an inch clearance (See Fig. #14).
The blade clearance can be viewed through the
discharge opening. Rotate the rotor and check the
clearance on both chipping blades.
6. Once clearance has been set, the lock collars must
be replaced to retain setting. Slip the lock collars
over the eccentric hub on the bearings. Using a
punch and a hammer, rotate the lock collars in the
direction of shaft rotation (i.e. clockwise on the rear
bearing and counter-clockwise on the front bearing)
and "set" the lock collars with a hammer tap. Tighten
the lock collar set screws.
7. Loosen the bushing holding the belt pulley on the
rotor shaft. Move the pulley on the shaft so it is
aligned directly below the similar pulley on the engine
shaft (the pulley should be moved an equal but
opposite amount the rotor was moved).
8. Replace the lower belt guard, discharge screen, and
rotor shaft cover.
Service and Maintenance
Fig. #14, Chipper blade clearance
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