EarthQuake CS4518B - Manual (Page 15)

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Operator's Manual
CS4518B CHAINSAW
ASSEMBLY
The Earthquake chainsaw carton includes the following
• Power Unit: Pre-assembled engine, handles, fuel tank,
oil tank, and chain brake handle.
• Guide Bar: Oregon® Double Guard 18”.
• Saw Chain: Oregon® 91VG or 91P S62
• “Scwrench” Multi-tool: Combination plug/bar wrench
and screwdriver
• Bar Scabbard: Plastic guard that fits over the guide bar
and saw chain.
• 5/32 inch round chain file
• Bar and chain have been installed for your conve-
nience.
Bar and Chain Removal and Assembly
1. Place the power unit on a flat, stable work surface with
the muffler facing to your right.
2. Pull back (toward the forward handle) on the
chain brake lever to ensure that the chain brake is
disengaged.
3. Using the “Scwrench” multi-tool, loosen and remove
the bar nuts securing the clutch cover to the power
unit. Set the clutch cover aside. Tip: If working in the
field, place the bar nuts in the clutch cover to keep from
losing them in grass or foliage.
4. Install the guide bar on the bar studs, and slide the
bar back until it comes into contact with the drive
sprocket.
5. Protective gloves should be used when handling
the chain. Carefully remove the saw chain from its
package. Stretch the chain out into a long horizontal
loop. The cutting teeth on the top length of chain
should face away from the power unit. The cutting
teeth on the bottom length of the chain should face
toward the power unit.
6. Wrap the chain around the drive sprocket first, and lay
the drive links of the chain into the groove along the
outer perimeter of the guide bar. Lay the chain over
the nose (tip) of the guide bar.
7. Slide the bar forward until the bar mates with the
tensioning tab. Make sure that the drive links of
the chain are seated within the groove around the
perimeter of the bar. If the bar will not slide forward
far enough, use the screwdriver end of the Scwrench
to turn the tension screw counter-clockwise. The
tension screw is located on the front of the power
unit, next to the guide bar.
WARNING
FAILURE TO PROPERLY TENSION THE CHAIN
COULD RESULT IN DAMAGE TO THE UNIT OR
SEVERE INJURY OR DEATH. OVER TENSIONING
COULD CAUSE DAMAGE TO THE SAW’S POWER
UNIT OR GUIDE BAR. LACK OF TENSION COULD
CAUSE THE CHAIN TO DISENGAGE THE BAR
COMPLETELY, ALLOWING IT TO WHIP BACK
WHERE IT COULD CONTACT THE OPERATOR
CAUSING SEVERE INJURY OR DEATH.
NOTE: Make sure the chain brake is OFF.
8. Replace the clutch cover over the bar, and turn the bar
nuts onto the bar studs. Only finger tighten the bar
nuts at this step.
9. Locate the tension screw on the front of the power
unit next to the guide bar. Use the Scwrench to turn
the tension screw clockwise. This will take the slack
out of the saw chain. When properly tensioned, two
conditions must be met:
• The chain should not hang or droop away from the
guide bar.
• You should be able to pull the chain slightly away from
the guide bar, but not so far as to be able to disengage
the drive links from the groove around the perimeter of
the bar.
10. Pull up on the guide bar’s nose and use the Scwrench
to tighten the bar nuts. Check that the chain spins
freely around the bar by hand. If there is resistance, the
chain may be too tight.
11. Place the bar scabbard over the guide bar and saw
chain. This guard will help to protect the user from
the sharp cutting teeth as well as help keep the
cutting teeth sharp when the saw is not in use.
12. Check the tension of the saw chain frequently during
use, especially during the first two hours of use on a
new chain. Re-tension as needed.
13. Always release the tension in the chain after finishing
work and before the saw chain and guide bar cool
completely. As the saw chain heats up during
operation, it will expand and stretch, requiring re-
tensioning on occasion. As the saw cools down the
saw chain will shrink, and if left tensioned, could cause
severe and permanent damage to the guide bar or the
power unit’s drive components.