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23
CAUTION
PROPER TENSION IS EXTREMELY IMPORTANT(Fig. 11, 12)
8. Raise the bar end and securely tighten the chain bar clamp nuts
with the box wrench. (Fig. 11)
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 bar and chain will
be damaged rapidly. Conversely, when the chain is excessively
loosened, it may get out of the groove in the 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. 13)
A
WARNING
○ This unit 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 contains highly fl ammable and it is possible to get the
serious personal injury 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.
○ Always mix fuel and oil in a separate clean container.
0.5 – 1
mm
24
22
Fig. 12
B
Fig. 13
Always start by fi ling half the amount of fuel, which is to be used.
Then add the whole amount of oil. Mix (shake) the fuel mixture. Add
the remaining amount of fuel.
Mix (shake) the fuel-mix thoroughly before fi lling the fuel tank.
Fueling
WARNING
○ Always shut off the engine before refueling.
○ Slowly open the fuel tank, when fi lling up with fuel, so that
possible over-pressure disappears.
○ Tighten the fuel 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 for any fuel leakage after refueling.
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. 14)
Fill up with chain oil (25). Always use good quality chain oil. When the
engine is running, the chain oil is automatically discharged.
25
1 cm
NOTE
Add chain oil when its level lowers to one centimeter from
bottom, (Fig. 14)
ADJUSTMENT OF CHAIN OIL SUPPLY
The chain oil quantity discharged through the lubrication system is
factory-adjusted to the standard. Adjust the quantity in accordance
with the operating condition. The numbered label (26) describes
order of chain oil adjustment. (Fig. 15)
○ Loosen the fi xing screw (27) one turn. (Fig. 15)
○ Turn the adjusting screw (28) clockwise to decrease the quantity
and turn it counter-clockwise to increase the quantity. (Fig. 16)
○ Do not try to turn the screw (28) clockwise beyond 1 turn from
its most counter-clockwise position or the maximum quantity
discharged position.
○ After adjustment has been made, tighten fi xing screw (27).
(Fig. 15)
27
Fig. 14
26
Fig. 15
7
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