Echo CH4400 Owners Manual v.2 - Manual (Page 20)

4 INCH CHIPPER 16
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
1. Lock disk assembly (Section 5.2).
2. Place a blade on the disk and attach using original
hardware. Torque the bolts to 120 ft.-lbs (162 Nm).
Repeat for the remaining blade.
3. Reinstall the chipper discharge cap or optional
discharge tube (Section 2.2).
45˚
SHARPENED
SURFACE
MOUNTING SURFACE
(DO NOT GRIND)
.50”
SHARPENED
SURFACE
MOUNTING SURFACE
(DO NOT GRIND)
1/16"
CHIPPER
BLADE
DISK
ANVIL
Figure 5.2 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.
5.5 SHARPENING THE BLADES
NOTE
If the chipping anvil edge is damaged or worn unevenly,
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.
5.6 INSTALLING THE BLADES
The chipping blades should clear the chipping anvil, located
directly under the chipper chute, by 1/16" to 1/8". Removing
the chipper chute is NOT required for setting the chipping
blade clearance. However, removing the chipper chute
5.7 SETTING BLADE CLEARANCE
can provide better access for measuring the chipping
blade clearance. To adjust the blade clearance, proceed
as follows:
1. Rotate the disk until a chipping blade is even with the
chipping anvil.
2. 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" (Figure
5.2).
3. Adjust the anvil by loosening the 5/16 x 5/8" bolts
holding the anvil to the disk cover and sliding the anvil
inward or outward until the desired measurement is
achieved.
4. Torque the bolts to 17 Ft-lbs.
5. Rotate the rotor to ensure the remaining blade clears
the anvil by 1/16" to 1/8" (not to exceed 1/8").
6. If the chipper chute was removed, reinstall it.
The blades can be ground on a bench grinder or by a
professional.
1. Never sharpen or grind the mounting surfaces of the
blades. This will cause the edge to roll and the blade will
be damaged, resulting in poor chipping performance.
2. Regrind the angled edge of the chipping blades to 45
degrees. Make sure some type of fixture is used to
correctly hold the blade at the proper angle.
3. Be careful when grinding so that the blade does not
become overheated and change color. This will remove
the heat-treated properties.
4. Use short grinding times and cool with water or some
type of liquid coolant.
5. Remove an equal amount off each blade to maintain
rotor balance.
6. Small imperfections such as nicks and burrs on the flat
side of the blade will not affect the chipping performance
of the machine.
7. 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.