Echo Bear Cat 70520 - Manual (Page 15)

12
7
3.2.2 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, proceede as
follows:
1. Remove the lower belt guard, the discharge screen
and the access cover.
2. Loosen the 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 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
figure 7). The blade clearance can be viewed
S E C T I O N 3
through the discharge opening. Rotate the rotor and
check the cleanance 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" them with a positive 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.