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Mounting the Gearbox
Pull the protective cap off the end of
N
the drive tube.
NOTICE
The plug may come out of the drive tube
when you pull off the cap. Push it back
into the drive tube as far as stop.
14
1
3
2
1
Loosen the clamp screws (1).
N
Push the gearbox (2) onto the drive
N
tube (3) – turn it back and forth at
the same time until the end of the
drive tube is no longer visible in the
slot (arrow) – then push it fully home
as far as stop.
Line up the gearbox on the drive
N
tube so that the machine support on
the engine points down and the
blades are horizontal.
Tighten down the clamp screws
N
firmly.

Fuel

This engine is certified to operate on
unleaded gasoline and the STIHL two-
stroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of high-
quality gasoline and two-stroke air
cooled engine oil.
Use mid-grade unleaded gasoline with a
minimum octane rating of 89 ((R+M)/2)
and no more than 10% ethanol content.
Fuel with a lower octane rating may
increase engine temperatures. This, in
turn, increases the risk of piston seizure
and damage to the engine.
The chemical composition of the fuel is
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines, etc.), but magnesium castings and
catalytic converters as well. This could
cause running problems or even
damage the engine. For this reason
STIHL recommends that you use only
high-quality unleaded gasoline!
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
and should not be used.
The ethanol content in gasoline affects
engine running speed – it may be
necessary to readjust the carburetor if
you use fuels with various ethanol
contents.
WARNING
To reduce the risk of personal injury
from loss of control and/or contact with
the running cutting tool, do not use your
HL 45

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