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Clean Muffler and Cooling System
Clutch and Maximum Speed Checks
CSG-680
Clutch
Slipping of the clutch under a cutting load is not the only thing that can
happen to a clutch. Another problem may appear during setting of the
carburettor for proper idling speed. The clutch may be at fault if an adjustment
high enough for stable idling results in wheel rotation. Such a condition should
be checked out by your servicing dealer before any further use of the saw.
Speed
To ensure the wheel does not over speed, the engine no load speed
must be adjusted to a maximum of 10000 r/min. Use a tachometer to
measure speed. If engine speed exceeds 10000 r/min, have the unit
serviced by your nearest ECHO servicing dealer before further use.
Whenever activated, the vibration-sensitive governor in the carburettor high
speed fuel circuit supplies more fuel than the engine can burn. Consequently,
the engine has to purge itself of the extra fuel and slows down in the process.
Proper high speed adjustment (see page 20) of the carburettor should result
in engine high speed, no load, operation within the desired range. This range
is 9500 r/min ± 500 r/min, which is required for the proper wheel spindle
speed range of 3930 – 4370 r/min.
22
The dust created in cutting is drawn into the cooling
system by the rotor fan. It can cover the cooling fins
and clog the air passages. Unless the system is
cleaned in time, the engine will run too hot.
Whenever cleaning the cooling system, take
advantage of the necessary removal of the covers,
and check the muffler at the same time.
1. Always begin cleaning by blowing or wiping down
the outside of the unit before doing any
disassembly.
2. Remove the parts of the air cleaner necessary to
expose the cylinder for cleaning. (See drawing,
page 19) Be careful to clean out the air cleaner
base plate if any dirt falls into it.
3. Clean all dust and grime out of the cooling
system passageways, and scrape the cylinder
cooling fins down to bare metal.
4. Clean deposits from silencer and tighten bolts.
Use only parts in good condition when
reassembling.
5. Reassemble the air cleaner on the saw.
WARNING
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