CHAIN TENSION
Stop the engine before setting the chain tension. Make sure the
guide bar screw is loosened to finger tight. Turn the chain tensioner
clockwise to tension the chain. A cold chain will be correctly tensioned
when there is no slack on the underside of the guide bar, the chain is
snug, but it can be turned by hand without binding.
Chain must be re-tensioned whenever the flats on the drive links hang
out of the bar groove.
During normal saw operation, the temperature of the chain will
increase. The drive links of a correctly tensioned warm chain will hang
approximately .050 in. (1.25mm) out of the bar groove. Be aware that
chain tensioned while warm, may be too tight upon cooling. Check the
“cold tension” before next use.
NOTE: A new chain tends to stretch. Check chain tension frequently
and tension as required.
CHAIN MAINTENANCE
CAUTION:
Remove the battery pack and make sure the chain has
stopped before you do any work on the saw.
For smooth and fast cutting, chain needs to be maintained properly.
The chain requires sharpening when the wood chips are small and
powdery, the chain must be forced through the wood during cutting,
or the chain cuts to one side. During maintenance of your chain
remember:
Improper filing angle of the side plate can increase the risk of
severe kickback.
Raker (depth gauge) clearance.
- Too low increases the potential for kickback.
- Not low enough decreases cutting ability.
If cutter teeth have hit hard objects such as nails and stones, or
have been abraded by mud or sand on the wood, have service
dealer sharpen chain.
NOTE: Inspect the drive sprocket for wear or damage when
replacing the chain. If signs of wear or damage are present in
the areas indicated, have the drive sprocket replaced by a qualified
individual.
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.
Wear gloves for protection. Properly tension the chain prior to
sharpening. Refer to “Chain Tension Section” earlier in this manual.
Do all of your filing at the midpoint of the bar.
Use a 5/32 in. diameter round file and holder.
Keep the file level with the top plate of the tooth. Do not let the file dip
or rock. Using light but firm pressure, stroke towards the front corner
of the tooth.
Lift file away from the steel on each return stroke.
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 filing from the file with a
wire brush.
WARNING:
Improper chain sharpening increases the potential of
kickback.
WARNING:
Failure to replace or repair damaged chain can cause
serious injury.
WARNING:
The saw chain is very sharp, always wear protective
gloves when performing maintenance to the chain.
TOP PLATE FILING ANGLE
Correct 30 degrees – File holders are marked with guide marks to
align file properly to produce top plate angle.
Less than 30 degrees – for
cross cutting.
More than 30 degrees –
feathered edge dulls quickly.
SIDE PLATE ANGLE
Correct – 80 degrees produced automatically if correct diameter file is
used in file holder.
Hook – “Grabs” and dulls quickly. Increases potential of kickback.
Results from using a file with a diameter too small, or file held to low.
Backward Slope – Needs too
much feed pressure, causes
excessive wear to bar and chain.
Results from using a file with a
diameter too large, or file held too
high.
DEPTH GAUGE CLEARANCE
The depth gauge should be maintained at a clearance of .025 in.
(0.6 mm). Use a depth gauge tool for checking the depth gauge
clearances.
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.
Depth gauge jointers are available
in .020 in. to .035 in. (0.5 mm to 0.9
mm). Use a .025 in. (0.6 mm) depth
gauge jointer. 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.
Depth gauges must be adjusted with
the flat file in the same direction the
adjoining cutter was filed with the
round file. Use care not to contact
cutter face with flat file when adjusting
depth gauges.
Approx. .050 (1.25mm)
6
CHAIN TENSION AND MAINTENANCE