Echo 7812086 Owners Manual v.3 - Manual (Page 19)

12 INCH CHIPPER 15
SERVICE & MAINTENANCE
BEFORE INSpECTINg OR SERvICINg ANY pART OF ThIS MAChINE, ShuT OFF pOwER SOuRCE, REMOvE kEY,
DISCONNECT ThE BATTERY CABLES AND MAkE SuRE ALL MOvINg pARTS hAvE COME TO A COMpLETE STOp.
WarninG
The chipper blades will eventually become dull, making
chipping difficult and adding extra strain on the machine. It
is recommended that the blades be sharpened every 5 to
15 hours or if your chipper’s performance has decreased.
The following symptoms indicate that the blades need to
be sharpened:
Severe vibration when feeding material into the chipper.
Small diameter branches do not self-feed.
Chips being discharged are small, discharge unevenly,
or have stringy tails, especially when chipping green
branches.
1.
2.
3.
Raise the knife access cover using the jack (Section
4.6) and secure with the lock pin.
Rotate the disk until a chipper blade is accessible.
Secure the disk to prevent movement while removing
the chipping blades.
Remove the three 5/8" x 3" bolts and nuts holding the
chipper blade to the disk and remove the blade; repeat
for remaining blades.
Inspect blades to see if cracks or nicks are visible. If
cracks are present, replace the blades. If nicks can not
be removed by sharpening blade, replace the blade.
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 figure below).
The base of the cutting edge is worn or has been re-
sharpened so that the edge extends less than 1/16"
above the rotor chipping slot.
when necessary, sharpen the blades yourself on a bench
grinder or take them to a professional.
1.
2.
3.
4.
5.
1.
2.
Chipping blades are sharp! use caution when working on
machine to avoid injury. Secure the chipping disk before
inspecting, removing or installing chipper blades.
Causes for replacing the blades
Regrind the angled edge of the chipping blades to 45
degrees (see below).
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.
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 per-
formance of the machine.
For blades that have been repeatedly sharpened,
ensure that the sharpened surface extends past the
chipping slot opening. If it extends less than 1/16"
above the opening, the blades should be replaced.
1.
2.
3.
4.
5.
6.
7.
8.
Secure the disk to prevent movement during installation.
place a blade on the disk and attach with three 5/8"
x 3" bolts and nuts. Torque to 230 ft-lbs. Repeat for
remaining blades.
Lower the knife access cover.
Secure the knife access cover to the chipper housing
using two 1/2" x 1-1/4" bolts, nuts and washers.
1.
2.
3.
4.
Both ends of the blade can be sharpened
WarninG
5.2..When.to.Sharpen.blaDeS
5.3..removinG.the.blaDeS
5.4..SharpeninG.the.blaDeS
5.5..inStallinG.the.blaDeS
Sharpened Surface
Mounting Surface:
Do Not Grind
Mounting Surface:
Do Not Grind
Sharpened
Surface
5/8”
45˚
1/8"