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16
Chain Tension
Check the chain tension before using the saw when the chain
is cold. The correct tension of a cold chain is when there is no
slack on the underside of the guide bar; the chain is snug, but
you can rotate it by hand without binding.
During normal saw operation, the temperature of the chain will
increase. The drive links of a correctly tensioned warm chain will
hang approximately 0.050 in. (1.25 mm) out of the bar groove
(Fig. 17). Be aware that a chain tensioned while warm may be
too tight upon cooling. Check the “cold tension” before next use.
The chain must be re-tensioned whenever the flats on the drive
links hang out of the bar groove (Fig. 17).
Chain Sharpening
mWARNING! To ensure that the saw works safely and
efficiently, it is essential that the cutting components are well-
sharpened. It is highly recommended to replace the chain
once it loses its ability to cut cleanly and safely. It is possible,
however, to sharpen the existing chain if the sharpening is
carefully performed. Any work on the chain and bar requires
specific experience and special tools. For safety purposes, we
recommend you contact an authorized
Snow Joe
®
+ Sun Joe
®
dealer or call the Snow Joe
®
+
Sun Joe
®
customer service center at 1-866-SNOWJOE
(1-866-766-9563).
Sharpening is necessary when:
• The sawdust looks like dust
• Cutting becomes more difficult
• The cut is not straight
• Vibrations increase
An authorized service center will sharpen the chain using the
right tools to ensure minimum removal of material and even
sharpness on all the cutting edges.
If you sharpen the chain by yourself, it's recommended to
purchase Sun Joe
®
24V-CSSHRP-LTE chain saw sharpener,
which can be powered by the same 24V iON+ battery with this
cordless pruning saw. Visit sunjoe.com or call the
Snow Joe
®
+ Sun Joe
®
customer service center at
1-866-SNOWJOE (1-866-766-9563) to order.
Otherwise, use special round-section files with the right diameter
depending on the type of chain (see “Chain Maintenance Table”
pg. 18). You need a certain amount of skill and experience to
avoid damaging the cutting edges.
Sharpen the chain as follows (Fig. 18):
• Secure the bar firmly, with the chain mounted, in a
suitable vise.
• Tighten the chain if it is loose.
• Mount the file in the guide and then insert it in the tooth at a
constant angle from the cutting edge.
• Sharpen in a forward motion a few times and repeat this on
all the cutting edges facing the same way (right or left).
• To move the chain forward, use a screwdriver.
• Turn the bar over in the vise and repeat on all the other
cutting edges.
• Check that the depth limiter tooth does not stick out farther
than the inspection tool and file any projecting parts with a
flat file, rounding off the edges (Fig. 18).
• After sharpening, remove all traces of filing and dust
and lubricate the chain in an oil bath. Replace the
chain whenever:
• The length of the cutting edges decreases to 5 mm
or less
• There is too much play between the links and the rivets
Fig. 17
Properly Adjusted Warm Chain
Approximately .050 in. (1.25 mm)
Flats are
visible here
Flats are not
visible here
Chain Needs Tensioning
Fig. 18
Inspection tool
Depth limiter tooth
Cutting edge
Depth
limiter
tooth
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