Maintenance - McCulloch CS 340 Manuel D'utilisation

4. Cut more than half of the diameter and then put the
felling wedge into the saw cut.
To fell a tree
1. Remove dirt, stones, loose bark, nails, staples and
wire from the tree.
2. Make a notch 1/3 the diameter of the tree,
perpendicular to the direction of the fall. (Fig. 63)
3. Make the lower horizontal notch cut. This will prevent
either the saw chain or the guide bar from being
pinched when the second notch is made.
4. Make the felling back cut (X) at least 50 mm (2 in)
higher than the horizontal notching cut. Keep the
felling back cut parallel to the horizontal notching cut
so enough wood is left to act as a hinge. Do not cut
through the hinge. The hinge wood keeps the tree
from twisting and falling in the wrong direction. (Fig.
64) (Fig. 65)
5. As the felling back cut nears the hinge, the tree
starts to fall. Make sure that the tree can fall in the
correct direction and not rock rearward and pinch the
saw chain. Stop the cut before the felling back cut is
complete to prevent this. Use wedges of wood,
plastic or aluminium to open the cut and let the tree
fall along the necessary line of fall. (Fig. 66)
6. When the tree begins to fall, remove the product
from the cut, stop the engine, put the product down,
then use the retreat path planned. Be alert for
overhead limbs falling and watch your footing. (Fig.
67)
WARNING: Read and understand the safety
chapter before you clean, repair or do
maintenance on the product.
Maintenance schedule
Make sure that you obey the maintenance schedule.
The intervals are calculated from daily use of the
product. The intervals are different if you do not use the
product each day. Only do the maintenance work that is
found in this manual. Speak to an approved service
center about other maintenance work not found in this
manual.
Daily maintenance
• Clean the external surfaces.
• Make sure that the lockout and trigger work
correctly.
• Clean the chain brake and make sure that it works
correctly.
(Fig. 73)
• Examine the chain catcher for damage. Replace the
chain catcher if it is damaged.
280 - 007 - 14.10.2019
To limb a tree
1. Use larger limbs to hold the log off the ground.
2. Remove small limbs in one cut. (Fig. 68)
3. Cut branches that have tension from the bottom to
the top to prevent pinching the saw chain or the
guide bar.
To buck a log
• If the log is supported along its entire length, cut
from the top of the log (known as overbucking). (Fig.
69)
• If the log is supported on one end, cut 1/3 the
diameter from the underside of the log (known as
underbucking) . (Fig. 70)
• If the log is supported on both ends, cut 1/3 the
diameter from the top. Complete the cut by
underbucking the lower 2/3 of the log to meet the
first cut. (Fig. 71)
• If you buck a log on a slope, always stand on the
uphill side of the log. Cut through the log while you
maintain complete control of the product, then
release the cutting pressure near the end of the cut
while firmly gripping the rear handle and front
handle. (Fig. 72)

Maintenance

(Fig. 74)
• Turn the guide bar daily for more even wear.
• Make sure that the lubrication hole in the guide bar is
not clogged.
(Fig. 75)
• Clean the guide bar groove.
(Fig. 76)
• Make sure that the guide bar and saw chain get
sufficient oil.
• Examine the saw chain:
• for cracks in the rivets and links.
• for abnormally worn rivets and links.
• for correct tension.
If necessary, replace the saw chain.
• Sharpen the saw chain. See
chain on page 23 .
• Examine the drive sprocket for excessive wear and
replace if necessary.
(Fig. 77)
• Clean the air intake of the starter unit.
• Make sure that the nuts and screws are tight.
CAUTION: Do not let the saw chain touch
the ground.
To sharpen the saw
21