Efco MTT 3600 Manuel D'utilisation Et D'entretien page 25

the following:
1. Improper filing angle of the side plate can
increase the risk of a severe kickback.
2. Raker (depth gauge) clearance: Too much
increases the potential for kickback; not
enough decreases cutting ability.
3. If cutter teeth have hit hard objects such as
nails and stones, or have been abraded by
mud or sand on the wood, have
Servicing Dealer sharpen chain.
4. In rare instances drive tangs could flare
resulting in chain not rotating freely. Replace
chain if necessary.
NOTE: Inspect the rim sprocket for wear or
damage when replacing the chain. If signs of
wear or damage are present in the areas, have
the rim sprocket replaced by a Servicing Dealer.
How to Sharpen the Cutters
Be careful to file all cutters to the specified angles
and to the same length, as fast cutting can be
obtained only when all cutters are uniform.
1. Wear gloves for protection. Tighten the chain
tension enough that the chain does not
wobble. Do all of your filing at the mid-point
of the bar. See Operation-Chain Tension.
2. Use a 3/16" diameter round file and holder.
3. Keep the file level with the top plate of the
tooth. Do not let the file dip or rock.
4. Using light but firm pressure, stroke towards
the front corner of the tooth. Lift file away
from the steel on each return stroke.
5 Put a few firm strokes on every tooth. File all
left hand cutters in one direction. Then move
to the other side and file the right hand
cutters in the opposite direction. Occasionally
remove filings from the file with a wire brush.
CAUTION: Dull or improperly sharpened
chain can cause excessive engine speed
during cutting which may result in severe
engine damage.
WARNING: It is absolutely essential to
comply with the angles and dimensions
specified below. If the saw chain is incorrectly
sharpened – and in particular if the depth
gauge is set too low – there is a risk of
increased kickback of the chainsaw, with
resulting risk of injury.
Failure to replace or repair damaged chain can
cause serious injury.
The saw chain is very sharp, always wear
p r o t e c t i ve g l o ve s w h e n p e r f o r m i n g
maintenance to the chain.
Top Plate Angle
File holders are marked with guide marks to align
file properly to produce correct TOP PLATE
ANGLE.
G) CORRECT- 30°
H) LESS THAN 30° - For Cross Cutting.
I) MORE THAN 30°- Feathered Edge Dulls
Quickly.
Side Plate Angle (Fig. 23)
J) CORRECT- 85° - 90°
Produced automatically if correct diameter
file is used in file holder.
K) "HOOK"- "Grabs" and dulls quickly. Increases
potential of KICKBACK.
Results from using a file with diameter too
small, or file held too low.
L) BACKWARD SLOPE- Needs too much feed
pressure, causes excessive wear to bar and
chain.
Results from using a file with diameter too
large, or file held too high.
Depth Gauge Clearance
1. The depth gauge should be maintained at a
clearance (Fig. 23) between .025 (0.65 mm)
and .024" (0.6 mm). Use a depth gauge tool for
checking the depth gauge clearances.
2. Every time the chain is filed, check the depth
gauge clearance.
Use a Flat File and a Depth Gauge Jointer to
lower all gauges uniformly (Fig. 24).
P) FLAT FILE
Q) DEPTH GAUGE JOINTER
Depth gauge jointers available in .020" to
.035" (0.5 mm to 0.9 mm). After lowering each
depth gauge, restore original shape by
rounding the front. Be careful not to damage
adjoining drive links with the edge of the file.
CAUTION: Af ter sharpening, clean
the chain thoroughly, remove filings
or grinding dust – lubricate the chain
thoroughly.
en
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