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Stump Grinder

E&OE

Maintenance

Cutting Teeth

Among the most critical elements of the machine are the cutting teeth. It
is also the most subject to damage and wear. During cutting, teeth not
only contact the stump, but also encounters numerous assortments of
abrasives and objects, such as dirt, stones, and occasionally a large rock
or buried scrap. The loss of and wear of cutting teeth can significantly
impair the efficiency and performance of the machine. Therefore, it is
important to make frequent observations of the condition of all of the
cutting teeth and replace or sharpen any damaged or worn teeth.

Do not allow the cutting teeth to wear too much before sharpening. The
cutting teeth must be removed from the machine before sharpening.

Read all of the following instructions before beginning to change
cutting teeth.

Changing Cutting Teeth.

1. Clean all dirt from the cutting wheel and teeth.

2. Check the cutting teeth for cracks, chips and damage. Replace

damaged or unserviceable cutting teeth.

3. Remove the 2 bolts securing the cutting tooth - be careful not to let any

parts drop when they become loose.

4. Re-install the tooth and securely tighten using the fixing bolts. Ensure

that the teeth align with wheel rotation and that the longer bolt is used
where it must fix teeth on both sides of the cutting wheel.

SHARPENING STEPS

For sharpening, you will need a 6- or 8-inch bench grinder, an aluminum-
oxide general-purpose grinding wheel, a [green] silicon-carbide wheel and
a single-point wheel dresser.

Then follow these steps:

1. Use the single-point wheel dresser to create a ½" groove in the middle- of the silicon-carbide wheel to

accommodate the radius of cutting tooth carbide tip.

2. Hold the tooth vertical and inverted so that the carbide tip faces up. Do not grind the face of the carbide.

3. Use the aluminum-oxide wheel to grind away some of the steel from the front of the tooth below carbide

tip, exposing the front of the carbide tip. Do not allow the cutting edge of the carbide tip to touch the
grinding wheel, as this will ruin the tip.

4. Hold the tooth vertical, with carbide tip facing up and carefully and gradually grind away the dulled portion

of the carbide tip against the silicon-carbide wheel, maintaining a 30-degree front cutting angle. Push the
tooth into the grinding wheel – do not lift the tooth into the wheel.

5. Depending on the tooth dullness, you may need to go back and forth between the aluminum oxide wheel

and the silicon-carbide wheel until you have restored a sharp cutting edge. As you become more familiar
with sharpening, you will be able to do it quickly.

Sharp teeth increase effectiveness of the machine, reduces working time and minimises wear and tear.

Place the tooth in position
against the side of the
cutting wheel.

Slide the 2 fixing bolts
through the tooth and
cutting wheel. One bolt is
longer and must also pass
through the tooth on the
opposite side of the cutting
wheel.

Attach a flat washer, lock
washer and nut to the bolts
and tighten securely. Check
that all cutting teeth bolts
are securely tightened.

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