Sharpening The Chain - ST. SpA A 3700 Manual De Instrucciones

14
EN
• Tuning minimum speed
WARNING!
when the engine is running idle. If the chain
moves when the engine is running idle, con­
tact your dealer to correctly regulate the en­
gine.

SHARPENING THE CHAIN

WARNING!
saw works safely and efficiently, it is essential
that the cutting components are well­sharp­
ened.
Sharpening is necessary when:
• The sawdust looks like dust.
• Cutting becomes more difficult.
• The cut is not straight.
• Vibrations increase.
• Fuel consumption increases.
WARNING!
ciently sharpened, the kick­back's risk in­
creases.
A specialized centre will sharpen the chain using
the right tools to ensure minimum removal of ma-
terial and even sharpness on all the cutting edges.
If you sharpen the chain yourself, use special
round-section files with the right diameter de-
pending on the type of chain (see "Chain Main-
tenance Table"). You need a certain amount of
Chain maintenance table
WARNING!
The table gives the sharpening data for different types of chains, but this
does not mean you can use chains other than those approved and listed in the "Correct bar
and chain combination table".
Chain pitch
inches
3/8 Mini
0.325
3/8
0.404
The chain must not move
To ensure that the chain­
If the chain is not suffi­
Limiter tooth level (a)
mm inches
9.32 0.018
8.25 0.026
9.32 0.026
10.26 0.031
MAINTENANCE AND STORAGE
skill and experience to avoid damaging the cutting
edges.
Sharpen the chain as follows (Fig. 24):
– Switch off the engine, release the chain brake
and secure the bar with the chain in a vice so
that the chain can run smoothly.
– 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).
– Turn the bar over in the vice and repeat on all the
other cutting edges.
– Check that the limiter tooth does not stick out
further than the inspection instrument and file
any projecting parts with a flat file, rounding off
the edge.
– 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 reduces to 5
mm or less;
– There is too much play between the links and
the rivets.
a a
mm
0.45
0.65
0.65
0.80
File diameter (d)
d d
inches mm
5/32 4.0
3/16 4.8
13/64 5.2
7/32 5.6