Echo 77412 Owners Manual v.3 - Manual (Page 21)

Crary Bear Cat Owners Manual 19
SERVICE & MAINTENANCE
BEFORE INSPECTING OR SERVICING ANY PART OF THIS MACHINE, SHUT OFF POWER SOURCE,
DISCONNECT SPARK PLUG WIRE FROM SPARK PLUG AND MAKE SURE ALL MOVING PARTS HAVE COME TO A COMPLETE STOP.
WARNING
5.3.3 INSTALLING THE BLADES
Lock disk assembly (Section 5.2).
Place a blade on the disk and attach using two 1/2" x 1-3/4"
flat head screws and two 1/2" security lock nuts. Torque the
1/2" security lock nuts to 120 Ft.-lb. Repeat for the remain-
ing blades.
Reinstall the chipper deflector (Section 2.3).
1.
2.
3.
5.3.2 SHARPENING THE BLADES
Never sharpen or grind the mounting surfaces of the blades.
This will cause the edge to roll and the blade will be dam-
aged, resulting in poor chipping performance.
Regrind the angled edge of the chipping blades to 45 de-
grees (Figure 5.3).
The blades can be ground on a bench grinder or by a pro-
fessional.
Make sure some type of fixture is used to correctly hold the
blade at the proper angle.
Be careful when grinding so that the blade does not become
overheated and change color. This will remove the heat-
treated properties.
Use short grinding times and cool with water or some type
of liquid coolant.
Remove an equal amount off each blade to maintain rotor
balance.
Small imperfections such as nicks and burrs on the flat side
of the blade will not affect the chipping performance of the
machine.
For blades that have been repeatedly sharpened, ensure
that the sharpened surface extends past the chipping slot
opening. If it does not extend past the opening, the blades
should be replaced.
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2.
3.
4.
5.
6.
7.
8.
9.
5 . 4 S E T T I N G C H I P P I N G B L A D E
CLEARANCE
The chipping blades should clear the chipping anvil, located
directly under the chipper chute, by least 1/16 inch. To adjust
the blade clearance, proceed as follows:
Removing the chipper chute is NOT required for setting the
chipping blade clearance, although, removing the chipper
chute can provide better access for measuring the chipping
blade clearance.
Rotate the disk until a chipping blade is even with the chip-
ping anvil.
Measure the amount of clearance between the chipping
blade and chipper anvil from inside of the chipper housing.
The minimum distance between the chipping blade and the
chipping anvil should be 1/16"
Adjust the anvil by loosening the 5/16" x 5/8" bolts hold-
ing the anvil to the disk cover and sliding the anvil inward
or outward until the desired measurement is achieved.
NOTE: If the chipping anvil edge is damaged or worn un-
evenly, remove the three 5/16" bolts and washers holding
the anvil to the disk cover and use one of the other three
edges. Adjust for correct measurement.
Tighten the bolts and torque to 17 Ft-lbs.
Reinstall the chipper chute.
1.
2.
3.
4.
5.
6.
Figure 5.3 - Double Edged Blade
MOUNTING SURFACE
DO NOT GRIND
MOUNTING SURFACE
DO NOT GRIND
SHARPENED
SURFACE
SHARPENED
SURFACE
45˚
.38
1/16"
DISK
CHIPPER BLADE
ANVIL
Figure 5.4 - Chipper Blade and Anvil Clearance
WARNING
It is important to ensure that the minimum gap between the
chipping anvil and ALL chipping blades is 1/16". All chipping
blades should be rotated until even with the chipping anvil
and then measured. Failure to do so can result in the
chipping blades striking the chipping anvil. Causing serious
injury or death.