Echo CH8993H Owners Manual v.7 - Manual (Page 23)

19 8 INCH TURNTABLE CHIPPER
ENGLISH
SERVICE & MAINTENANCE
BEFORE INSPECTING OR SERVICING ANY PART OF THIS MACHINE, SHUT OFF POWER SOURCE,
DISENGAGE THE HYDRAULICS, OPEN SHIELD AND MAKE SURE ALL MOVING PARTS HAVE COME TO A COMPLETE STOP.
WARNING
Figure 5.2, Chipper Blade Surfaces
The chipping blades should clear the chipper block locat-
ed directly under the chipper chute by 1/16" to 1/8"(Figure
5.3). To adjust the blade clearance, proceed as follows:
1. Remove the two 3/8" bolts securing the access cover to
the main frame. Tilt access cover over to allow access
to anvil
2. Loosen the three 1/2" bolts that hold the chipper anvil
to the frame.
3. Measure the amount of clearance between chipping
blades and chipping anvil from inside of housing. Adjust
inward or outward to desired measurement.
4. Check clearance on all the blades.
5. Tighten bolts on chipping anvil to 75 Ft-lb and resume
operation.
6. If chipping anvil edge is damaged or worn unevenly,
remove the three bolts holding the anvil and use
one of the other three edges. Adjust for correct
measurement.
1. Install the disk lock (Section 5.2). The disk is now
restrained for installing the blades.
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. Lower the access cover and secure to the chipper
housing using two 3/8" retaining bolts.
4. Remove disk lock.
5.5 SHARPENING THE BLADES
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 (Figure 5.2). 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.
5.6 INSTALLING THE BLADES
45˚
SHARPENED
SURFACE
MOUNTING SURFACE
(DO NOT GRIND)
.50”
SHARPENED
SURFACE
MOUNTING SURFACE
(DO NOT GRIND)
5.7 SETTING CHIPPER BLADE CLEARANCE
Figure 5.3, Chipper Blade/Anvil Clearance
ANVIL
CHIPPER
BLADE
ROTOR
ANVIL
SPACER
1/16" - 1/8" 1/2” BOLT