Clean Muffl Er And Cooling System; Clutch And Maximum Speed Checks - Hitachi CM14E Manuel D'utilisation

Clean Muffl er and Cooling System

Clutch and Maximum Speed Checks

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 cutter.
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 HITACHI 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 22) 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.
23
The dust created in cutting is drawn into the
cooling system by the rotor fan. It can cover the
cooling fi ns 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 muffl er 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 20) 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 fi ns 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 cutter.
WARNING
GB