Echo CH911DH Owners Manual v.2 - Manual (Page 18)

9 INCH CHIPPER 14
SERVICE & MAINTENANCE
BEFORE INSPECTINg OR SERVICINg ANy PART OF THIS MACHINE, SHuT OFF POWER SOuRCE,
AND MAkE SuRE All MOVINg PARTS HAVE COME TO A COMPlETE STOP.
WARNING
Figure 5.1, Sharpening the chipper blades
5.2 CHIPPER bLADE mAINTENANCE
The chipping blades are sharp!! Use care when
working on the machine to avoid injury.
WARNING
5.4 SHARPENING THE bLADES
5.3 REmovING THE bLADES
The chipper blades will eventually become dull, making
chipping difficult and adding extra strain on the machine.
CHECk THE SHARPNESS oF THE bLADES EvERY
5 - 15 HouRS oF oPERATIoN AND SHARPEN AS
NEEDED.
your blades need to be sharpened if:
•
Machine vibrates severely when material is fed into the
chipper.
• Small diameter branches do not self-feed.
• Chips discharge unevenly or have stringy tails, espe-
cially when chipping green branches.
Before you sharpen the chipping blades, check for
permanent damage. Replace the blade if:
•
There are cracks, broken corners or nicks greater than
1/8" (see below).
• The base of the cutting edge is worn or has been re-
sharpened so that it no longer extends past the chipping
slot (see below).
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.
NEW
BLADE
CHIPPER
DISC
CHIPPING
SLOT
CHIPPER
DISC
BLADE IS
TOO SHORT,
MUST BE
REPLACED
CHIPPING
SLOT
NICK GREATER
THAN 1/8”
CRACK
GREATER
THAN 1/8”
BROKEN
CORNER
45˚
SHARPENED
SURFACE
MOUNTING SURFACE
(DO NOT GRIND)
.38
SHARPENED
SURFACE
MOUNTING SURFACE
(DO NOT GRIND)
Remove the two 3/8" bolts on the rotor access cover. 1.
Tilt access cover open to allow access to rotor. Rotate 2.
the rotor so that the bolts holding the blades are best
accessible.
Remove the two nuts and cap screws holding the blade
3.
itself. Repeat for all blades. The blades have two edges
per blade and can be reversed one time each before
sharpening.