Maintenance - Hitachi CH 50EA3 (ST) Handling Instructions Manual

Fig. 6
5. When you hear the engine attempts to start, return choke lever
to RUN position (open) (C). Then pull recoil starter briskly
again.
NOTE
If engine does not start, repeat procedures from 2 to 4.
6. After starting engine, allow the engine about 2-3 minutes to
warm up before subjecting it to any load.
Cutting
When cutting, operate engine at full throttle as this maintains proper
cutter speed. When trimming top of hedge, hold trimmer so blades
are between 15 and 30 degrees from a horizontal position and
swing trimmer in an arc toward edge of hedge to sweep cuttings off .
When trimming sides of hedge, hold blade vertically and swing unit
in an arc.
NOTE
○ Multi-position twist handle (Fig. 7)
The rear control handle turns 90 degrees to provide comfortable
use while accommodating a variety of cutting angles. The
handle allows for fi ve diff erent locking positions. Before
attempting to adjust rear handle, make sure the machine is at
idle or engine is shut off .
○ The machine will automatically shut off if the throttle lever
is pressed while the handle is NOT secured in one of the fi ve
preset positions. Never attempt to operate the machine unless
the rear handle is properly locked in place.
To rotate the handle; push the lock lever (6) allowing the handle
to turn. Press the lock lever (6) to release the lock and allow
the handle to turn. Rotate the handle to the desired 0°, 45° or
90° locking position and press the release lever (7) to lock the
handle in place.
D: LOCK
E: UNLOCK
6
E
D
7
Fig. 7
Stopping (Fig. 8)
Decrease engine speed, and push ignition switch to stop position
(F).
F
Fig. 8

MAINTENANCE

MAINTENANCE, REPLACEMENT OR REPAIR OF THE EMISSION
CONTROL DEVICES AND SYSTEM MAY BE PERFORMED
BY ANY NONROAD ENGINE REPAIR ESTABLISHMENT OR
INDIVIDUAL.
Carburetor adjustment (Fig. 9)
WARNING
○ The cutting attachment may be spinning during carburetor
adjustments.
○ Never start the engine without the complete clutch cover.
Otherwise the clutch can come loose and cause personal
injuries.
In the carburetor, fuel is mixed with air. When the engine is test run
at the factory, the carburetor is adjusted. A further adjustment may
be required, according to climate and altitude. The carburetor has
one adjustment possibility:
T = Idle speed adjustment screw.
Idle speed adjustment (T)
Check that the air fi lter is clean. When the idle speed is correct, the
cutting attachment will not rotate. If adjustment is required, close
(clockwise) the T-screw, with the engine running, until the cutting
attachment starts to rotate. Open (counter-clockwise) the screw
until the cutting attachment stops. You have reached the correct idle
speed when the engine runs smoothly in all positions well below the
rpm when the cutting attachment starts to rotate.
If the cutting attachment still rotates after idle speed adjustment,
contact Hitachi dealer.
Fig. 9
2
T
7