Operation Manual

11
English
NOTE
If engine does not start, repeat procedures from 2 to 4.
5. After starting engine, then allow the engine about 2–3 minutes
to warm up before subjecting it to any load.
Cutting (Fig. 19, 20, 21)
○ When cutting, operate engine at over 6500 rpm. Extended time
of use at low rpm may wear out the clutch prematurely.
○ Cut grass from right to left.
○ Blade thrust may occur when the spinning blade contacts a
solid object in the critical area.
A dangerous reaction may occur causing the entire unit and
operator to be thrust violently. This reaction is called blade
thrust. As a result, the operator may lose control of the unit
which may cause serious or fatal injury. Blade thrust is more
likely to occur in areas where it is diffi cult to see the material to
be cut.
○ Wear the harness as shown in the fi gure (if so equipped). The
blade turns counter-clockwise, therefore, be advised to operate
the unit from right to left for effi cient cutting. Keep onlookers out
of working area at least 15 m.
NOTE
Press the quick release button or pull emergency release fl ap
(If so equipped) in the event of emergency.
WARNING
If cutting attachment should strike against stones or other
debris, stop the engine and make sure that the attachment and
related parts are undamaged. When grass or vines wrap around
attachment, stop engine and attachment and remove them.
Stopping (Fig. 22)
Decrease engine speed and run at an idle for a few minutes, then
turn off ignition switch.
WARNING
A cutting attachment can injure while it continues to spin after
the engine is stopped or power control is released. When the
unit is turned off , make sure the cutting attachment has stopped
before the unit is set down.
Semi-auto cutting head
6. Adjusting line length
○ Set the engine speed as low as possible and tap the head on
the ground. The nylon line will be drawn out about 3 cm with
each tap. (Fig. 23)
Also, you can extend the nylon line by hand but the engine must
be completely stopped. (Fig. 24)
○ Adjust the nylon line to the proper length of 11–14 cm before
each operation.
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. 25)
WARNING
○ The cutting attachment may be spinning during carburetor
adjustments.
○ Never start the engine without the complete fan case 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 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 your Hitachi dealer.
NOTE
○ Standard Idle rpm is 3000 rpm.
○ 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.
WARNING
When the engine is idling the cutting attachment must under no
circumstances rotate.
Changing the engine oil
Dirty engine oil will considerably reduce the service life of the
engine. Check and change the engine oil regularly.
CAUTION
○ To avoid the risk of burn injuries, allow the engine to cool
thoroughly before changing the engine oil.
○ To prevent breakdown, ensure that no sand or dirt gets into the
tank while refueling.
When to change the oil: When fi rst using the unit, after
approximately 10 hours of operation or after 1 month, whichever
occurs earlier; subsequently, after every 50 hours of operation or
every 6 months, whichever occurs earlier.
Specifi ed engine oil: Multigrade oil of classifi cation SAE 10W-30
Engine oil capacity: 80 ml
1. Turn off the ignition switch.
2. Check that the fuel cap is securely tightened.
3. Remove the oil cap, tilt the unit so that the oil tank opening is on
the underside and drain the engine oil into a container. (Fig. 26)
4. When all the engine oil has been drained, place the unit
horizontally on a clean, fl at surface.
5. Fill the oil tank with engine oil up to the mouth of the oil tank
opening. (Fig. 15)
6. Tighten the oil cap securely by hand.
NOTE
○ Do not dispose of waste engine oil with garbage or into the
ground.
Dispose of the oil according to the specifi ed method in your
area.
If you are unsure, contact the retailer where the oil was
purchased.
○ Fill the oil tank with the specifi ed amount of engine oil.
Too much or too little engine oil may result in engine
breakdown.
○ Engine oil deteriorates naturally even if unused.
Change the engine oil regularly.
Air fi lter (Fig. 27)
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.
000Book_CG25EUS_WE.indb 11000Book_CG25EUS_WE.indb 11 2009/12/25 21:39:082009/12/25 21:39:08