Makita RBC320 Bedienungsanleitung PDF herunterladen (Seite 57)

57

“Ecologic” oil pump

Most models in MAKITA's petrol chain-

saw range, from the DCS430 up to the

DCS7900, are equipped with an intelli-

gent oil pump, which cuts off the oil

flow when the engine is idling and

resumes pumping when the chain is

running. This economizes on chain oil

and helps to minimize pollution. The oil

flow can be adjusted according to the

length of guide bar fitted to the machi-

ne.

Primer

A useful starting aid for cold starts.

Pressing the plastic ball a few times

ensures that the additional amount of

fuel needed for a cold start is fed to

the carburettor.

High-performance engines

Professional chainsaw users in the

forestry industry and private users both

want a chainsaw that combines maxi-

mum cutting performance with mini-

mum weight.

MAKITA petrol engines are highly deve-

loped power units that produce high

torque at low engine speeds. This

gives the saw useful reserves of power.

A computer-aided development of the

modern 2-stroke engine delivers stea-

dy maximum revs together with the

desired rapid acceleration. Modern

multi-channel technology and a sophi-

sticated system of gas-exchange con-

trol serve to cut exhaust pollution and

reduce fuel consumption. Based on a

combination of modern, high-tech

engineering materials and traditional

metals, MAKITA engines are built to

give many years of dependable servi-

ce. The result: rugged and economical

engines for safe and precise cutting in

all areas of forestry work – whether fel-

ling, logging or debranching.

Torque

Minimum torque

requirement

Operating range of a chainsaw

designed to deliver maximum

peak power

Operating range of a MAKITA chainsaw

designed for maximum torque delivery

across a broas speed range

57

Power-to-weight ratio

A good chainsaw needs to be as light

and manoeuvrable as possible, while

developing plenty of power to maximi-

ze cutting performance. The ratio bet-

ween engine output, measured in Hp,

and engine weight, measured in kg, is

therefore an important yardstick of

comparison when choosing the right

chainsaw for the job. MAKITA chain-

saws use modern lightweight materi-

als and precision engineering techni-

ques to achieve some of the best

power-to-weight figures in the indu-

stry. The MAKITA DCS7900, for exam-

ple, generates 6.3 Hp from an engine

weighing 1 kg/6 Hp, which gives it an

industry-leading power-to-weight ratio

of just 1kg/1 Hp.

Injection carburettor

Selected MAKITA petrol chainsaw models –

DCS4300i, DCS5200i, DCS6000,

DCS6800 and DCS3400 TH – are fitted

with MAKITA's own patented injection car-

burettor. The exact amount of fuel needed

to start the engine is injected into the car-

burettor through a precisely calibrated jet.

This means that the engine receives an

ignitable fuel-air mixture under all operating

conditions.

The injection carburettor ensures that the

chainsaw starts easily in all weather condi-

tions, whether starting from cold or restar-

ting a hot engine.

Injection gas collector carburettor

A further development of MAKITA's paten-

ted injection carburettor for petrol chainsaw

models DCS6000 i and DCS6800 i. When

the inlet valve is opened the gases from the

fuel tank flow through a supply line into the

aspiration channel of the carburettor. Fuel

and vapours cannot escape from the tank.

The fully sealed system collects any esca-

ping fuel vapours. This technology also

facilitates easier starting.

KEY TECHNICAL FEATURES

1 kg : 1 Hp

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