EarthQuake CS4518B - Manual (Page 20)

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Operator's Manual
CS4518B CHAINSAW
Saw Chain Maintenance
Keeping the saw chain sharp is a critical component to operat-
ing 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 sharp-
ness 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 use and sharpening.
Check for the following:
• Bent or burred drive links
• Broken cutters or tie-straps
• Loose rivets or broken rivet heads
• Dull, nicked, or damaged cutters.
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.
Spark Plug
The recommended spark plug is a NGK BPMR7A, Champion
RCJ7Y, or Torch L8RFT.
Steps for Removing the Spark Plug
1. Remove the air cleaner cover by turning the thumb
screw on top of the power unit counter-clockwise and
lifting the cover off.
2. Disconnect the spark plug cap and clean any debris
from around the spark plug area.
3. Remove spark plug using the “Scwrench” multi-
tool. Replace if any of the following occur; pitted
electrodes, burned electrodes, cracked porcelain, or
deposits around the electrodes.
4. After analysis, seat spark plug and hand turn until
finger tight.
Installing Spark Plug
1. Reinstall original spark plug, tighten additional 1/2 turn.
2. Installing new spark plug, adjust spark plug gap to
0.025” (0,635mm) and tighten additional 1/8 – 1/4
turn.
NOTE: Loose spark plug may overheat and damage
engine. Over tightened spark plug may damage
threads in the cylinder head.
Carburetor
NOTE: 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. Never tighten a warm/hot chain.
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 with the
adjustment screw at side of bar.
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.