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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 2800-3200 rpm.
WARNING
When the engine is idling the cutting attachment must under no
circumstances rotate.
Air fi lter (Fig. 32)
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
Open the air fi lter cover and the fi lter (28). 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. 33)
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.
NOTE
If element is hard due to excessive dirt buildup, replace it.
Spark plug (Fig. 34)
The spark plug condition is infl uenced by:
○ An incorrect carburetor setting
○ Wrong fuel mixture (too much oil in the gasoline)
○ A dirty air fi lter
○ Hard running conditions (such as cold weather)
These factors cause deposits on the spark plug electrodes, which
may result in malfunction and starting diffi culties. If the engine
is low on power, diffi cult to start or runs poorly at idling speed,
always check the spark plug fi rst. If the spark plug is dirty, clean it
and check the electrode gap. Re-adjust if necessary. The correct
gap is 0.6 mm. The spark plug should be replaced after about 100
operation hours or earlier if the electrodes are badly eroded.
NOTE
In some areas, local law requires using a resistor spark plug
to suppress ignition signals. If this machine was originally
equipped with resistor spark plug, use same type of spark plug
for replacement.
Flexible drive shaft (Fig. 35)
Flexible drive shaft should be removed and lubricated with good
quality lithium grease every 20 hours. To remove the fl exible shaft,
fi rst remove screw (29), loosen bolt (30) and remove the gear case
then pull the shaft out of the drive shaft pipe. Clean the shaft off and
apply a generous coat of lithium grease to it and insert if back into
the drive shaft pipe, turn it unit it drops into place then install the
gear case, install & tighten screw (29) and screw (30).
Angle transmission (Fig. 36)
Check angle transmission or angle gear for grease level about every
50 hours of operation by removing the grease fi ller plug on the side
of angle transmission.
If no grease can be seen on the fl anks of the gears, fi ll the
transmission with quality lithium based multipurpose grease up to
3/4. Do not completely fi ll the transmission.
Semi-auto cutting head
Nylon line replacement
(1) Remove the case (31) by fi rmly pushing inward the locking tabs
with your thumbs as shown in Fig. 37.
(2) After removing the case, take out the reel and discard the
remaining line.
(3) Fold the new nylon line unevenly in half as shown in picture.
Hook the U-shaped end of the nylon line into the groove (32) on
the center partition of the reel.
Wind both halves of the line on the reel in the same direction,
keeping each half of the line on its own side of the partition.
(Fig. 38)
(4) Push each line into the stopper holes (33), leaving the loose
ends approx. 10 cm in length. (Fig. 39)
(5) Insert both loose ends of the line through the cord guide (34)
when placing the reel in the case. (Fig. 40)
NOTE
When placing a reel in the case, try to line up the stopper holes
(33) with the cord guide (34) for easier line release later.
(6) Place the cover over the case so that the cap locking tabs (35)
on the case meet the long holes (36) on the cover. Then push
the case securely until it clicks into place. (Fig. 41)
(7) The initial cutting line length should be approx. 11–14 cm and
should be equal on both sides. (Fig. 42)
Blade (
Fig. 43)
WARNING
Wear protective gloves when handling or performing
maintenance on the blade.
○ Use a sharp blade. A dull blade is more likely to snag and thrust.
Replace the fastening nut if it is damaged and hard to tighten.
○ When replacing blade, purchase one recommended by Hitachi,
with a 25.4 mm (one inch) fi tting hole.
○ When installing a saw blade (38), always face the stamped side
up. In the case of a 3 or 4 tooth blade (37), it can be used on
either side.
○ Use the correct blade for the type of work.
○ When replacing blades, use appropriate tools.
○ When cutting edges become dull, re-sharpen or fi le as shown
in the illustration. Incorrect sharpening may cause excessive
vibration.
○ Discard blades that are bent, warped, cracked, broken or
damaged in any way.
NOTE
When sharpening blade it is important to maintain an original
shape of radius at the base of the tooth to avoid cracking.
Maintenance schedule
Below you will fi nd some general maintenance instructions. For
further information please contact your Hitachi dealer.