Maintenance - Hitachi CH22EPA Handling Instructions Manual

WARNING
During operation, hold the unit fi rmly with both hands. A single
hand operation may cause serious injury.
Adjustment of blade angle (Fig. 16, 17)
WARNING
Always stop engine before making adjustments.
Never touch the blade when adjusting blade angle. Hold the
support handle (20) instead.
1. Stop the engine.
2. Loosen handle knob (21) slightly so that the support handle (20)
slides.
3. Adjust the blade angle to desired position by holding the support
handle (20).
4. Then, fi nger-tighten the handle knob (21) securely.
20
Trimming techniques
This unit is designed for trimming hedges and small branches.
Follow these tips for successful operation.
○ Plan cut carefully. Check direction branch will fall.
○ Long branches should be trimmed in several pieces.
○ Do not stand directly beneath branch being cut.
○ Apply a light cutting pressure.
○ Ease cutting pressure when nearing end of cut to maintain
control.

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. 18)
WARNING
○ The cutting attachment may be spinning during carburetor
adjustments.
○ 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.
8
21
Fig. 16
Fig. 17
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 Authorized Service Centers.
T
NOTE
Standard Idle rpm is 2500 – 3000 min
WARNING
When the engine is idling the cutting attachment must under no
circumstances rotate.
Air fi lter (Fig. 19)
The air fi lter must be cleaned from dust and dirt in order to avoid:
○ Carburetor malfunctions
○ Starting problems
○ Engine power reduction
○ Unnecessary wear on the engine parts
○ Abnormal fuel consumption
Clean the air fi lter daily or more often if working in exceptionally
dusty areas.
Cleaning the air fi lter
Remove the air fi lter cover and the fi lter (22). Rinse it in warm soap
suds. Check that the fi lter is dry before reassembly. An air fi lter
that has been used for some time cannot be cleaned completely.
Therefore, it must regularly be replaced with a new one. A damaged
fi lter must always be replaced.
Fuel fi lter (Fig. 20)
Drain all fuel from fuel tank and pull fuel fi lter line from tank. Pull fi lter
element out of holder assembly and rinse element in warm water with
detergent.
Rinse thoroughly until all traces of detergent are eliminated.
Squeeze, do not wring, away excess water and allow element to air
dry.
Fig. 18
.
-1
22
Fig. 19