Warning, 3 chipper blades – Echo 76824 Owners Manual v.1 User Manual

Page 19

PN 18280-00 R121505

SERVICE & MAINTENANCE

BEFORE INSPECTING OR SERVICING ANY PART OF THIS MACHINE, SHUT OFF POWER SOURCE,

DISENGAGE THE HYDRAULICS AND MAKE SURE ALL MOVING PARTS HAVE COME TO A COMPLETE STOP.

WARNING

Chipping blades are sharp! Use caution when working on

machine to avoid injury.

WARNING

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 5.2).
The base of the cutting edge is worn or has been re-sharp-

ened so that the edge extends less than 1/16" above the

rotor chipping slot.

1.
2.
3.

5.3.1 REMOVING THE BLADES

Remove the two 3/8 inch retaining bolts securing the access

cover to the main frame assembly.
Tilt access cover over to allow access to rotor. Rotate the

rotor so that the bolts holding the chipper blades are ac-

cessible.
Install the disk lock (Section 5.2). The disk is now restrained

for removing the blades. To access the remaining blades,

remove the punch or screwdriver and reposition disk. Return

the punch or screwdriver to the rotor lock hole.
Remove the two hex head bolts holding the blade to the

rotor.

Figure 5.2 - Causes for Replacement

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5.3.2 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 damaged,

resulting in poor chipping performance.
Regrind the angled edge of the chipping blades to 45 degrees

(Figure 5.3).
The blades can be ground on a bench grinder or by a pro-

fessional.
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.

5.3 CHIPPER BLADES

Figure 5.3 - Chipper Blade Surfaces

MOUNTING SURFACE
DO NOT GRIND

MOUNTING SURFACE

DO NOT GRIND

SHARPENED
SURFACE

45˚

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