Filling Up With Fuel And Oil - GMC PCH25 Instruction Manual

10. Check that the chain can be
smoothly pulled around the
guide bar by hand and that
it maintains contact with the
guide bar, top and bottom.
To check tension, rotate the
chain to its tightest condition
then suspend a 0.9kg weight from the chain at the mid
point of the underside of the bar. The maximum distance
between the driving links and the bar should be 6.5mm.
Note. Ensure the engine is switched off when making any
adjustments to the chain and bar.
CAUTION. A new chain will stretch after just a few minutes
of use. Check and, if necessary, re-adjust the chain tension.
A loose chain causes rapid wear to both the chain and the
guide bar and could derail causing a major safety hazard.

Filling up with fuel and oil

WARNINGS.
Petrol is very flammable. Avoid smoking or
causing any sparks or flames near fuel. Make sure that
you stop the motor and allow it to cool before refuelling the
machine. Select outdoor bare ground for fuelling and move at
least 3m away from the fuelling point before starting the motor.
• Only use oil that is expressly labelled for use with air-
cooled 2-stroke engines. DO NOT
(2-stroke water-cooling type) mixed oil.
The recommended mixing ratio is
• Use unleaded petrol with a minimum Octane number of
89. If you use petrol with an Octane number lower than 89,
there is a danger that the engine might overheat and the
piston seize.
• Poor quality petrol or oil may damage sealing rings, fuel
lines or the fuel tank. Do not use wasted or regenerated
oil, it can damage the oil pump.
CAUTION. To maximise the lifetime of the engine, avoid the
following:
• Do not use raw petrol, it will severely damage the engine
very quickly.
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use BIA or TCW
PETROL 35: OIL 1
10
• Do not run the tank dry, as this will cause damage to
the engine.
• Do not use oil meant for 4-stroke engines, it will cause spark
plug fouling, exhaust blocking and piston ring sticking.
• Do not use fuel mixtures that have been left standing for one
month or more, they can cause clogging of the carburettor.
Before storing the chainsaw for an extended period,
empty the fuel tank, clean it then run the motor to empty
the carburettor.
Note.
Do not discard an unwanted fuel container with
household waste. It must be taken to an authorised
repository site.
Mixing fuel (35:1 mixing ratio)
1. Measure out the quantities of petrol and oil to be mixed.
2. Put some of the petrol into a clean, approved fuel container.
3. Pour in all of the oil and mix well.
4. Pour in the rest of the petrol and again mix well (at least
one minute).
5. It is very important to mix the two ingredients properly to
prevent unnecessary engine wear.
6. Make sure that the container
is clearly labelled that it is
2-stroke mixture.
Fuelling the chainsaw
1. The engine must be stopped
and cool. Place the chainsaw
on its side with the fuel tank
cap facing upwards.
2. Make sure that the fuel
mixture is well mixed.
3. Remove the fuel tank cap (23).
4. Fill the fuel tank to about 80%
of its capacity.
5. Fasten the fuel cap securely
and wipe up any fuel spillage
around the machine.