EarthQuake CS4518 - Manual (Page 19)

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Operator's Manual
CS4518 Chainsaws
CARBURETOR
Never tamper with the factory setting of the carburetor.
SAW CHAIN TENSION MAINTENANCE
Keeping the saw chain at the proper tension is necessary for
safe operation and will help prolong the life of the saw chain
and the guide bar.
1. Shut the power unit off and allow the saw to cool.
2. The saw chain should not hang down from the bottom edge
of the guide bar.
3. Wearing protective gloves, hold the guide bar with one hand
and pinch the chain with the free hand.
4. Pull down on the chain. It should pull away from the bar, but
the drive links should not disengage the groove around the
perimeter of the guide bar.
5. Add or remove tension as needed.
6. Hold up on the guide bar nose and tighten the bar nuts with
the Scwrench.
Add tension at the beginning of every work session.
Check tension at every re-fueling.
Remove tension at the end of every work session.
SAW CHAIN MAINTENANCE
Keeping the saw chain sharp is a critical component to operating
a chainsaw. A dull saw chain will drastically reduce cutting
efficiency and can pose certain safety hazards.
• Avoid unintentionally striking foreign objects. This can cause
a kickback, but will also reduce the sharpness or permanently
damage the saw chain.
• Avoid cutting wood that has been drug on the ground. Sand,
dirt, and mud stuck to the log will dull the saw chain.
• Avoid cutting wood that may contain metal such as nails,
staples, or wire.
• Avoid cutting all the way through when bucking a log. This
could allow the chain to come into contact with the soil below,
dulling the saw chain.
Sharpening Saw Chain Cutters (Teeth)
The saw chain included with this saw is a 91VG Chamfer Chisel™ or
91P Chamfer Chisel™ and requires a 5/32 inch round file (included
in the original packaging).
When to have your saw chain sharpened:
• Sawdust becomes powder-like
• You need to force the saw into the cut
• The saw tends to cut through at an angle instead of making a
straight cut
• Vibration increases
• Fuel consumption increases
Always inspect your saw chain prior to sharpening. Check for
the following:
• Bent or burred drive links
• Broken cutters or tie-straps
• Loose rivets or broken rivet heads
If broken components are found, discard the chain immediately.
To properly sharpen you saw chain:
1. Be sure to have the correct size file and file guide.
2. When hand filing it’s important that 1/5, or 20 percent, of the
file’s diameter is always held above the cutter’s top plate.
3. Keep the correct top-plate filing angle line on your file guide
parallel with the chain.
4. Sharpen all cutters on one side of the chain first. Sharpen
by filing from the inside of each cutter to the outside. After
sharpening the first side, turn the saw around and repeat the
process for cutters on the other side of the chain.
5. If the chrome surface of the top or side plates is damaged, file
back until such damage is removed.
6. Keep all cutters at an equal length. Begin filing on the cutter
with the most damage, and file all subsequent cutters to the
same length.
7. DO NOT alter or file the tops of bumper tie strap links (between
each cutter) on the 91VG chain.
8. File ONLY on the “Push” stroke, do not pull the file against any
metal object as this will damage the file.
It is also important to maintain the depth gauge setting
throughout the lifespan of the saw chain. 91VG and 91P chains
use a depth setting of .025”. This setting should be checked and
corrected every third or fourth time the saw chain is sharpened.
1. Place the correct depth-gauge tool over the chain, with one
depth gauge protruding through the slot in the tool.
2. If the depth gauge extends above the slot, use a flat file to bring
the depth gauge flush with the top of the tool. Use only the
push stroke of the file. Pulling the file will damage the file.
3. Make sure to round over the leading edge of the depth gauge
to prevent kickbacks and tie strap breakage.