Echo Bear Cat 70580 v.1 - Manual (Page 19)

3 INCH CHIPPER/SHREDDERS
17
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
5.2 chiPPer bladeS
The chipper blades will eventually become dull, making chipping
difficult and adding extra strain on the machine. Poor chipping
performance is usually a result of dull chipping blades. It is
recommended that the blades be sharpened every 5 - 15 hours
or if your chipper’s performance has decreased. Check for the
following symptoms and sharpen the blades if needed.
severe vibration when feeding material into the chipper.
small diameter branches do not self-feed.
Chips discharge unevenly or have stringy tails, especially
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"
(Figure 5.1).
The base of the cutting edge is worn or has been re-sharp-
ened so that it sits too close to the rotor chipping slot.
1.
2.
3.
1.
2.
5.2.3 inSTalling The bladeS
Place a blade on the rotor and attach with two 5/16" x 1-1/2"
bolts. Torque to 25 Ft-lb. Repeat for the second blade.
Attach the shredder screen to the machine with one 5/16"
x 7/8" bolt and nylock nut.
Lower the discharge door into the normal operating position.
For "s" models, reinstall the discharge assembly.
1.
2.
3.
5.2.1 removing The bladeS
Flip the discharge door up. For "s" models, remove the
discharge assembly.
Remove the 5/16" x 7/8" bolt and nylock nut holding the
shredder screen to the bottom of the frame.
disconnect and remove the shredder screen from the
machine.
Remove the two 5/16" x 1-1/2" hex bolts securing the chipper
blade to the rotor. Repeat for the second blade.
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.
1.
2.
3.
4.
5.
5.2.2 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 5.2).
The blades can be ground on a bench grinder or by a profes-
sional.
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.
1.
2.
3.
4.
5.
6.
7.
8.
9.
MOUNTING SURFACE
DO NOT GRIND
SHARPENED
SURFACE
SHARPENED
SURFACE
DO NOT GRIND
MOUNTING SURFACE
.25
45°
Figure 5.2 - Double Edged Blade
Warning
Chipping blades and shredder knives are sharp! use caution
when working on machine to avoid injury.
Figure 5.1 - Causes for Replacement
1/8"