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CS51EANE
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Hitachi CS51EANE [10/113] English

English

ASSEMBLY PROCEDURES

WARNING

Never try to start engine without side case, bar and chain

securely fastened.

1. Pull the front hand guard (2) toward the front handle to check that

the chain brake is disengaged. (Fig. 2)

2. Remove guide bar clamp nuts (3). Remove the side case (4).

(Fig. 3)

3. Install the guide bar (5) onto the bolts (6), then push it toward the

sprocket (7) as far as it will go.

4. Conﬁ rm the direction of saw chain (12) is correct as in the ﬁ gure,

and align the chain on the sprocket. (Fig. 5)

5. Guide the chain drive links into the bar groove all around the bar.

6. Install the side case (4) onto the bolts (6).

Make sure that the boss of chain tension adjust bolt (8) ﬁ ts into

the hole (9) of the bar. (Fig. 4)

The brake lever (11) of the side case must ﬁ t the groove (10) on

the side of the front hand guard.

Then tighten the guide bar clamp nuts (3) by hand that allows the

guide bar end to move up and down easily.

(

Fig. 3

)

7. Raise the bar end, and tighten the chain (12) by turning the

tension adjustment bolt (13) clockwise. To check proper tension,

lightly lift up the center of chain and there should be about 0.5

– 1.0 mm clearance (14) between bar and edge of drive link.

(Fig. 6, 7)

CAUTION

PROPER TENSION IS EXTREMELY IMPORTANT

8. Raise the bar end and securely tighten the guide bar clamp nuts

with the combi box spanner. (Fig. 7)

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. 8)

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 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.

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.

Fueling

WARNING (Fig. 9)

○ Always shut oﬀ the engine before refueling.

○ Slowly open the fuel tank (15), when ﬁ lling up with fuel, so that

possible overpressure 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 any fuel leaking 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. 9)

Fill up with chain oil (16). Always use good quality chain oil. When the

engine is running, the chain oil is automatically discharged.

NOTE

When pouring fuel (15) or chain oil (16) into the tank, place the

unit with cap side up. (Fig. 9)

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. 10)

Chain brake operation (Fig. 2, 11)

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 towards

the 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 the front hand guard 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.

How to conﬁ rm the activation of the chain brake

1) Turn oﬀ the engine.

2) Holding the chain saw horizontally, release your hand from the

front handle, hit the tip of the guide bar to a stump or a piece

of wood, and conﬁ rm brake operation. Operating level varies by

bar size.

In case the brake is not eﬀ ective, ask our dealer for inspection and

repairs.

Starting (Fig. 11 – 16)

CAUTION

Before starting, make sure chain brake is engaged and that the

bar/chain does not touch anything. (Fig. 11)

1. Set ignition switch (18) to ON position. (Fig. 12)

*Push priming pump (20) several times so that fuel ﬂ ows through

bulb into carburetor. (Fig. 13)

2. Pull the choke lever (19) to choked position (Fig. 13).

This will automatically lock to the half-throttle.

3. Push the decompression valve (21).

The valve (21) will automatically return to the original position

once the engine has started (Fig. 14).

4. Pull recoil starter briskly, taking care to keep the handle in your

grasp and not allowing it to snap back. (Fig. 15)

5. When you hear ﬁ rst ignition, return the choke lever (19) all the

way in.(Fig. 13)

6. Push the decompression valve.

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Hitachi CS51EANE [10/113] English

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