Hitachi CS25EPA Owner's Manual page 11

T
Pruning techniques
This attachment is designed for pruning small
limbs and branches up to 8" in diameter.
Follow these tips for successful operation.
•
Plan cut carefully. Check direction branch will
fall.
•
Long branches should be removed in several
pieces.
•
Do not stand directly beneath branch being
cut.
•
When ready to cut:
Hold "front cutting guide" against branch.
This will prevent whipping of the branch. DO
NOT use back and forth sawing action.
(Fig. 2-11)
•
Look out for branch immediately behind the
branch being cut, If blade hits rear branch
damage to blade may occur. (Fig.2-12)
•
Accelerate to full throttle.
•
Apply a light cutting pressure.
•
Ease cutting pressure when nearing end of
cut to maintain control.
•
When pruning a limb 4 inch diameter or larger,
cut as follows: (Fig.2-13)
1. Undercut 1/4 limb diameter near tree trunk.
2. Finish top cut slightly farther out on limb.
3. Flush cut stub at trunk.
•
DO NOT use for felling or bucking.
GB-10
Fig.2-11
5. Maintenance
MAINTENANCE, REPLACEMENT, OR REPAIR
OF THE EMISSION CONTROL DEVICES AND
SYSTEMS MAY BE PERFORMED BY ANY
NON-ROAD ENGINE REPAIR
ESTABLISHMENT OR INDIVIDUAL.
Carburetor adjustment (Fig. 3-1)
WARNING!
The cutting attachment may be spinning
during carburetor adjustments.
WARNING!
Never start the engine without the complete
clutch cover and tube assembled! 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
basically 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 filter 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.2-12
T
Fig. 3-1
INOTE!
Standard Idle rpm is 2500~3000 rpm.
WARNING!
When the engine is idling the cutting
attachment must under no circumstances
rotate.
NOTE!
Some models sold areas with strict exhaust
emission regulation do not have high and low
speed carburetor adjustments. Such
adjustments may allow the engine to be
operated outside of their emission compliance
limits. For these models, the only carburetor
adjustment is idle speed.
Fig.2-13