EMAK GST 250 Manual De Instrucciones página 37

WARNING - A sharp chain produces well-
defined chips. When your chain starts to
produce sawdust, it is time to sharpen.
After every 3-4 times the cutters have been
sharpened you need to check the height of the
depth gauges and, if necessary, lower them using
the flat file and template supplied optional, then
round off the front corner (Fig. 24).
WARNING - Proper adjustment of the
depth gauge is as important as proper
sharpening of the chain.
GUIDE BAR
The guide bars provided with a sprocket at
their tip must be lubricated with grease using a
lubrication syringe.
The bar should be reversed every 8 working
hours to ensure uniform wear.
Keep the bar groove and lubrication hole clean
using the bar groove cleaner supplied optional.
Check the bar rails frequently for wear and, if
necessary, remove the burs and square-up the
rails using the flat file.
WARNING - Never mount a new chainsaw
on a worn sprocket.
AIR FILTER - Rotate the knob (A, Fig. 25) and
check the air filter (B) each day. Open air cleaner
(B) by means of the two tabs (C). Clean with Emak
degreaser p/n 001101009A, rinse with water
and blast dry with compressed air, not too close,
blowing from the inside outwards. Renew the
filter if heavily clogged or damaged.
WARNING! – When refitting the air filter (B),
fit it into well, before reassembly.
FUEL FILTER - Check the fuel filter periodically.
Replace it if too dirty (Fig. 26).
OIL PUMP (automatic) - Flow adjustment is
pre-set by the manufacturer. Oil flow occurs only
when the chain is moving.
WARNING - Never use scavenge oil.
STARTING UNIT - Use a brush or compressed
air to keep the cooling louvers of the starter
assembly free and clean.
ENGINE - Clean the c ylinder fins with
compressed air or a brush periodically.
Dangerous overheating of engine may occur
due to impurities on the cylinder.
SPARK PLUG - Clean the spark plug and check
the electrode gap periodically (Fig. 27).
Use NGK CMR7A or of other brand with the same
thermal grade.
CHAIN BRAKE - If the chain brake does not work
properly, remove the chain cover and the clean
brake components. Replace the chain brake band
if worn or deformed.
GUIDE BAR - Turn the guide bar and check that
the lubrication holes are free from impurities.
Never use fuel for cleaning operations.
CARBURETOR
Before adjusting the carburetor, clean the starter
cover, the air filter (Fig. 25) and warm up the
engine.
Idle screw T (Fig. 28) is adjusted in order to ensure
a good safety margin between idle running and
clutch engagement.
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