Dolmar PS-410 Instruction Manual page 12

Chain brake
A
The DOLMAR models PS‑40, 4 comes with an inertia
chain brake as standard equipment. If kickback occurs due to
contact of the guide‑bar tip with wood (see SAFETY PRECAU‑
TIONS, page 6), the chain brake will stop the chain through
inertia if the kickback is sufficiently strong. The chain will stop
within a fraction of a second.
The chain brake is installed to block the saw chain before
starting it and to stop it immediately in case of an emer-
gency.
IMPORTANT: NEVER run the saw with the chain brake
activated (except for testing, see "Checking the chain bra‑
ke")! Doing so can very quickly cause extensive engine
damage!
ALWAYS release the chain brake before starting
the work!
Fuel / Refuelling
Gasoline
+
000 cm ( litre)
3
5000 cm (5 litres)
3
C 0000 cm (0 litres)
3
Fuel mixture
The engine of the chain saw is a high‑efficiency two‑stroke engine.
It runs on a mixture of gasoline and two‑stroke engine oil.
The engine is designed for unleaded regular gasoline with a
min. octane value of 9 ROZ. In case no such fuel is available,
you can use fuel with a higher octane value. This will not affect
the engine.
In order to obtain an optimum engine output and to protect
your health and the environment use unleaded fuel only.
For lubricating the engine use a two‑stroke engine oil (quality
grade: JASO FC or ISO EGD), which is added to the fuel. The
engine has been designed for use of DOLMAR HP 00 high‑
performance two‑stroke engine oil and a mixture ratio of only
00: to protect the environment. In addition, a long service
life and reliable operation with a minimum emission of exhaust
gases are ensured. DOLMAR HP 00 high‑performance two‑
stroke engine oil is available in the following sizes:
0.5 l order number 980 008 09
DOLMAR high‑performance two‑stroke engine oil is available
in the following sizes to suit your individual requirements:
 l order number 980 008 07
00 ml order number 980 008 06
In case DOLMAR high‑performance two‑stroke engine oil is not
available, it is urgently recommended to use a mixture ratio of
40: with other two‑stroke engine oils, as otherwise optimum
operation of the engine cannot be guaranteed.

40:1
50:1 100:1
5 cm 0 cm 0 cm
3 3
5 cm 00 cm 50 cm
3 3
50 cm 00 cm 00 cm
3 3
B
Engaging the chain brake (braking)
If the kickback is strong enough the sudden acceleration of
the guide bar combined with the inertia of the hand guard
(B/3) will automatically actuate the chain brake.
To engage the chain brake manually, simply push the hand
guard (B/3) forward (towards the tip of the saw) with your left
hand (arrow 1).
Releasing the chain brake
Pull the hand guard (B/3) towards you (arrow 2) until you feel
it catch. The brake is now released.
The correct mixture ratio:
50:1
when using DOLMAR high‑performance two‑stroke
engine oil, i. e. mix 50 parts gasoline with  part oil.
100:1 when using DOLMAR HP 00 high‑performance two‑
stroke engine oil, i. e. mix 00 parts gasoline with  part
oil.
40:1
when using other two‑stroke engine oils, i. e. mix 40
parts gasoline with  part oil.
NOTE: For preparing the fuel‑oil mixture first mix the entire oil
quantity with half of the fuel required, then add the remaining
3
fuel. Thoroughly shake the mixture before filling it into the chain
3
saw tank.
3
It is not wise to add more engine oil than specified to ensure
safe operation. This will only result in a higher production of
combus‑tion residues which will pollute the environment and
clog the exhaust channel in the cylinder as well as the muffler.
In addition, fuel consumption will rise and performance will
decrease.
Fuel storage
Fuel cannot be stored for an unlimited period of time. Buy only
as much as will be consumed in 4 weeks. Use only approved
and marked containers for transport and storage.
D
Chain oil
Use an oil with adhesive additive for lubricating the chain and
guide bar. The adhesive additive prevents the oil from being
flung off the chain too quickly.
2
1
3