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9.
A new chain will stretch so adjust the chain after a few cuts and
watch chain tension carefully for the fi rst half hour of cutting.
NOTE
Check the chain tension frequently for optimum performance
and durability.
CAUTION
○ When the chain is excessively tightened, the guide bar and
chain will be damaged rapidly. Conversely, when the chain is
excessively loosened, it may get out of the groove in the guide
bar.
○ Always wear gloves when touching the chain.
WARNING
During operation, hold chain saw fi rmly with both hands. A single
hand operation may cause serious injury.
OPERATING PROCEDURES
Fuel (Fig. 10)
WARNING
○ The chain saw is equipped with a two-stroke engine. Always
run the engine on fuel, which is mixed with oil. Provide good
ventilation, when fueling or handling fuel.
○ Fuel is highly fl ammable and it is possible to get seriously injured
when inhaling or spilling on your body.
Always pay attention when handling fuel. Always have good
ventilation when handling fuel inside building.
Fuel
○ Always use branded 89 octane unleaded gasoline.
○ Use genuine two-cycle oil or use a mix between 25:1 to 50:1,
please consult the oil bottle for the ratio or Hitachi Authorized
Service Centers.
○ If genuine oil is not available, use an anti-oxidant added quality
oil expressly labeled for air-cooled 2-cycle engine use (JASO
FC GRADE OIL or ISO EGC GRADE). Do not use BIA or TCW
(2-stroke water-cooling type) mixed oil.
○ Never use multi-grade oil (10 W/30) or waste oil.
○ Never mix fuel and oil in machine's fuel tank. Always mix fuel and
oil in a separate clean container.
Always start by fi lling half the amount of gasoline, which is to be
used.
Then add the whole amount of oil. Mix (shake) the fuel mixture. Add
the remaining amount of gasoline.
Mix (shake) the fuel-mix thoroughly before fi lling the fuel tank.
Mixing amount of two-cycle oil and gasoline
Gasoline (Liter)
0.5
1
2
4
Fueling (Fig. 11)
WARNING
○ Always shut off the engine and let it cool for a few minutes before
refueling.
Do not smoke or bring fl ames or sparks near the fueling site.
8
Fig. 10
Two-cycle oil (ml)
Ratio 50:1
Ratio 25:1
10
———
20
20
———
40
40
———
80
80
———
160
○ Slowly open the fuel tank (15), when fi lling up with fuel, so that
possible overpressure disappears.
○ Tighten the fuel tank cap carefully, after fueling.
○ Always move the unit at least 3 m from the fueling area before
starting.
○ Always wash any spilled fuel from clothing immediately with
soap.
○ Be sure to check any fuel leaking after refueling.
15
Before fueling, clean the tank cap area carefully, to ensure that no
dirt falls into the tank. Make sure that the fuel is well mixed by shaking
the container, before fueling.
Chain oil (Fig. 11)
WARNING
Never use waste or regenerated oil. If you use them, it will cause
damage to your health or this unit.
Slowly open the oil tank (16), and fi ll up with chain oil. Always use
high quality chain oil. When the engine is running, the chain oil is
automatically discharged.
Fill up the oil tank (16) with chain oil every time when refueling.
NOTE
When pouring fuel or chain oil into the tank, place the unit with
cap side up. (Fig. 11)
ADJUSTMENT OF CHAIN OIL SUPPLY
The chain oil quantity discharged through the lubrication system
is adjusted to the maximum in the factory. Adjust the quantity in
accordance with the operating condition.
Turn the adjusting screw (17) counterclockwise to increase the
quantity and turn it clockwise to decrease the quantity. (Fig. 12)
17
Chain brake operation (Fig. 2, 13)
Chain brake is designed to activate in an emergency such as kick-
back action.
Application of brake is made by moving the front hand guard (2)
towards the guide bar. During the chain brake operation, even if
the throttle lever is pulled, the engine speed does not increase and
the chain does not turn. To release the brake, pull up the front hand
guard (2) toward the front handle.
If the engine keeps rotating at high speed with the brake engaged,
the clutch will overheat causing trouble.
When the brake engages during operation, immediately release the
throttle lever to slow down the engine.
16
Fig. 11
Fig. 12
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