Extraordinary Maintenance - Stiga SPR 255 Manual De Instrucciones

18
EN
If you sharpen the chain yourself, use special
round-section files with the right diameter depend-
ing on the type of chain (see "Chain Maintenance
Table"). You need a certain amount of 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.
BAR MAINTENANCE (Fig. 25)
To avoid asymmetrical wear on the bar, make sure
it is turned over periodically.
To keep the bar in perfect working order, proceed
as follows:
– grease the bearings on the nose sprocket (if
present) with the syringe;
– Clean the bar groove with the scraper (not in-
cluded);
– clean the lubrication holes;
– with a flat file, remove burr from the edges and
level off the guides.
Replace the bar whenever:
– the groove is not as deep as the height of the
drive links (which must never touch the bottom);
– the inside of the guide is worn enough to make
the chain lean to one side.

EXTRAORDINARY MAINTENANCE

All maintenance operations not foreseen in this
manual must be performed exclusively by your
dealer.
MAINTENANCE AND STORAGE
All and any operations performed in unauthorised
centres or by unqualified persons will totally invali-
date the warranty.
STORAGE
After every work stint, clean the machine thor-
oughly to remove all dust and debris, and repair
or replace any faulty parts.
The machine must be stored in a dry place away
from the elements and with the bar cover correctly
fitted.
LONG PERIODS OF DISUSE
IMPORTANT
machine for a period of more than 2-3 months, we
recommend you do a few things before putting it
away. This will make it easier when you want to
use the machine again and will also prevent per­
manent damage to the engine.
• Storage
Before putting the machine away:
– Clean and maintain the chain-saw before sto-
ring.
– Unscrew the nut, disassemble the cover and
remove the chain and bar.
– Empty the oil tank, fill with about 100-120 cc of
specific liquid detergent and plug the cap.
– Remove the cover without tightening the nut,
making sure to insert the two rear fasteners in
their respective slots properly.
– Start the engine and keep it running until all de-
tergent is used.
– Start the engine and run it idle until it uses up all
the fuel that is left in the tank and the carburettor.
– Remove the spark plug after the engine cools.
– Pour a teaspoon of (new) 2-stroke engine oil into
the spark plug slot.
– Pull the starter grip several times to deliver oil
to the cylinder.
– Replace the spark plug with the piston in the
dead end upper position (visible from the spark
plug slot when the piston is at maximum stroke).
• Restarting work
When you wish to start using the machine again:
– Remove the spark plug.
– Pull the starter rope a few times to eliminate
excess oil.
– Check the spark plug as described in chapter
"Checking the spark plug".
– Prepare the machine as indicated in the para-
graph entitled "Preparing for work".
If you are not going to use the