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Checking the chain brake
IICI
I
Do
not work with the chain saw without flrst checking the
chain brake1
-
Start the engine as described (make sure you have a good
footing, and place the chain saw on the ground in such a
way that the guide bar is free
of
contact).
-
Grasp the tubular handle firmly with one hand and hold the
grip with the other.
-
-With the engine running at moderate speed, press the hand
f
y
m until the chain brake engages. The chain should
stop immediately.
-
Immediately release the throttle and release the chain
brake.
IMPORTANT:
If
the chain does not stop immediatelywhen
you test the chain brake, do NOT use the chain saw. Take
the chain saw-to a MAKITA senrice center for repair.
guard ((31) in the direction of the arrow
Adjusting the carburetor
Important Information:
The carburetor
o f
this tool is litted with limiter caps which restrict
the range of adjustment and prevents over-rich mixture settings.
This ensures providing good engine power and efficient fuel
consumption. Before installing the limiter
caps,
the manufacturer
performs
the .Basic Adjustment" procedure.
Optimum perfomance can only be achieved if the carbure-
tor
I s
adjusted correctly.
For
this work, which should
be
cam'ed out by an expert, the engine must
be
warmed up and
the alr filter clean.
The
carburetor has been adjusted by MAKITA
on
the basis of
abnosheric pressure conditions at sea level. Other atmospheric
pressure conditions or the running-in process of a new engine
may require readjustment of
the
carburetor.
It is urgently recommended to use a revolution indicator (U1)
(order number 950 233
210)
in order to achieve a correct
adjustment of the carburetor. Adjust the carburetor using a
0.16"
(4 mm) screwdriver
(u2,
in assembly tool kit with
1 1 3
only).
The screwdriver shown
(W2)
(order number 944 340
001)
has
a molded-on lug
to
assist in adjustment.
Before adjusting the carburetor the engine must be warmed
up for a period of 3-5 min.
For
adjusting the carburetor correctly the following steps
must be carried out:
-
.
1. Check adjustment
2. Start engine
3. Set idle speed
4. Adjust speed
5. Check idling speed
6. Check acceleration
7. Check max. speed or output
8.
Repeat adjustment procedure starting with step 3, until
idling speed, m a . speed and acceleration are reached
with the adjustment made.
Checking the chain lubrication
Never work with the chain saw withoute sufficient chain lubri-
cation. Otherwise the service life
o f
the chain and guide barwill
be reduced. Before starting work check the oil level in the tank
and the oil feed.
Check the oil feed rate
as
described below:
-
Start the chain saw.
-
Hold the running chain saw approx.
6 '
(15 cm) above a
trunk or the ground (use an appropriate base).
If the lubrication is sufficient, you will see a light oil trace
because oil will be flung off the sawing device. Pay attention
to
the direction the wind is blowing and avoid unnecessary
exposure to the oil spray!
Adjustment instructions (step
1)
@
Before initial operation make sure that the adjusting screws
(H and
L)
have not been set in all the way. Limiter caps do not
protect the engine from leaning. Tum the two adjusting screws
(H
and
L)
counter-clockwise as far
as
they will go.
Start the engine and let it warm up (step
2)
Set idle speed (step 3)
-
a+
If
the chain tums when the engine is idling, unscrew the
throttle-valve stop screw (S) until the chain stops. If the
engine runs unevenly, screw the screw (S) back in.
Idling speed should be 2.500 rpm.
Adjust the speed by adjusting the main jet screw (H) to
12.500
(DCS430,431,520) and 1 3 . W (DCS 520i. 540,5200i) rpm.
After having adjusted the max. speed ensure the idle speed
is set
to 2,500
rpm. (the chain must not turn). Use the idle
jetscrew(L)toregulateit.Turninthescrew (L) tospeed up,
and tum out the screw
(L)
to speed down the engine.
Now check the acceleration, i. e. the time necessary for
speeding up from idle speed !o max. speed. To do this,
press the throttle lever hard.
If the acceleration is too low, tum out the idle jet screw
(L)
approx.
110
rotation.
23
-
Adjust speed (output) (step 4)
-
Check idle speed (item
5)
-
Check acceleration (item 6)
-
-
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