Stihl BR 450, BR 450 C Instruction Manual

STIHL BR 450, 450 C

Instruction Manual

Contents

English

Guide to Using this Manual 2
Safety Precautions and Working

Techniques 2
Assembling the Unit 7
Adjusting the Throttle Cable 10
Fitting the Harness 10
Fuel 10
Fueling 11

Original Instruction ManualPrinted on chlorine-free paper

Information Before You Start 12
Starting / Stopping the Engine 12
Operating Instructions 15
Replacing the Air Filter 15
Adjusting the Carburetor 16
Spark Plug 17
Engine Running Behavior 18
Storing the Machine 18
Maintenance and Care 19
Minimize Wear and Avoid Damage 21
Main Parts 22
Specifications 23
Maintenance and Repairs 24
Disposal 24

Printing inks contain vegetable oils, paper can be recycled.

EC Declaration of Conformity 24
UKCA Declaration of Conformity 25

Dear Customer,

Thank you for choosing a quality
engineered STIHL product.

It has been built using modern
production techniques and
comprehensive quality assurance.
Every effort has been made to ensure
your satisfaction and trouble-free use of
the product.

Please contact your dealer or our sales
company if you have any queries
concerning this product.

Your

Dr. Nikolas Stihl

© ANDREAS STIHL AG & Co. KG, 2021

0458-391-0121-B. VA0.H21.

0000007082_008_GB

BR 450, BR 450 C

This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.

1

English

Guide to Using this Manual

Symbols in text

WARNING

Warning where there is a risk of an
accident or personal injury or serious
damage to property.

NOTICE

Caution where there is a risk of
damaging the machine or its individual
components.

Engineering improvements

STIHL's philosophy is to continually
improve all of its products. For this
reason we may modify the design,
engineering and appearance of our
products periodically.

Therefore, some changes, modifications
and improvements may not be covered
in this manual.

Pictograms

The meanings of the pictograms
attached to the machine are explained in
this manual.

Depending on the model concerned, the
following pictograms may be attached to
your machine.

Fuel tank; fuel mixture of
gasoline and engine oil

Operate manual fuel
pump

Operate electric starter

Safety Precautions and
Working Techniques

Special safety precau­tions must be observed
when working with a
power tool.

It is important that you
read the instruction man­ual before first use and
keep it in a safe place for
future reference. Non­observance of the
instruction manual may
result in serious or even
fatal injury.

Observe all applicable local safety
regulations, standards and ordinances.

If you have not used this model before:
Have your dealer or other experienced
user show you how it is operated or
attend a special course in its operation.

Minors should never be allowed to use
this product.

Keep bystanders, especially children,
and animals away from the work area.

When the power tool is not in use, put it
in a place where it does not endanger
others. Secure it against unauthorized
use.

The user is responsible for avoiding
injury to third parties or damage to their
property.

Do not lend or rent your power tool
without the instruction manual. Be sure
that anyone using your power tool
understands the information contained
in this manual.

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BR 450, BR 450 C

English

The use of noise emitting power tools
may be restricted to certain times by
national or local regulations.

Do not operate your power tool if any of
its components are damaged.

Do not use a pressure washer to clean
your power tool. The solid jet of water
may damage parts of the power tool.

Accessories and replacement parts

Only use parts and accessories that are
explicitly approved for this power tool by
STIHL or are technically identical. If you
have any questions in this respect,
consult a servicing dealer. Use only high
quality parts and accessories in order to
avoid the risk of accidents and damage
to the machine.

STIHL recommends the use of original
STIHL replacement parts and
accessories. They are specifically
designed to match the product and meet
your performance requirements.

Never attempt to modify your machine in
any way since this may increase the risk
of personal injury. STIHL excludes all
liability for personal injury and damage
to property caused while using
unauthorized attachments.

Physical Condition

To operate this power tool you must be
rested, in good physical condition and
mental health.

If you have any condition that might be
aggravated by strenuous work, check
with your doctor before operating a
power tool.

Persons with pacemakers only: The
ignition system of your power tool
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. To
reduce health risks, STIHL recommends
that persons with pacemakers consult
their physician and the pacemaker
manufacturer before operating this
power tool.

Do not operate the sprayer if you are
under the influence of any substance
(drugs, alcohol) which might impair
vision, dexterity or judgment.

Intended Use

The blower is designed for blow­sweeping leaves, grass, paper and
similar materials, e.g. in gardens, sports
stadiums, car parks and driveways. It is
also suitable for blow-sweeping forest
paths.

Do not blow-sweep hazardous
materials.

Do not use the machine for any other
purpose because of the increased risk of
accidents and damage to the machine.
Never attempt to modify the product in
any way since this may result in
accidents or damage to the product.

Clothing and Equipment

Wear proper protective clothing and
equipment.

Clothing must be sturdy
but allow complete free­dom of movement. Wear
snug-fitting clothing, an
overall and jacket combi­nation, do not wear a
work coat.

Avoid clothing with loose
drawstrings, laces and
ribbons, scarves, neck­ties, jewelry or anything
that could be sucked into
the air intake in the side
and bottom of the
machine. Tie up and con­fine long hair so that it
cannot be sucked into the
machine.

Wear sturdy shoes with non-slip soles.

WARNING

To reduce the risk of eye
injuries, wear close-fit­ting safety glasses in
accordance with Euro­pean Standard EN 166.
Make sure the safety
glasses are a comforta­ble and snug fit.

Wear hearing protection, e.g. earplugs
or ear muffs.

STIHL offers a comprehensive range of
personal protective clothing and
equipment.

Transporting the Power Tool

Always shut off the engine.

BR 450, BR 450 C

3

English

Transporting in a vehicle:

– Properly secure your power tool to

prevent turnover, fuel spillage and
damage.

Fueling

Gasoline is an extremely
flammable fuel. Keep
clear of naked flames. Do
not spill any fuel – do not
smoke.

Always shut off the engine before
refueling.

Do not fuel a hot engine – fuel may spill
and cause a fire.

Always remove the power tool from your
back and put it on the ground before
refueling. Fuel the machine only when it
is standing on the ground.

Open the fuel cap carefully to allow any
pressure build-up in the tank to release
slowly and avoid fuel spillage.

Fuel your power tool only in well­ventilated areas. If you spill fuel, wipe
the machine immediately – if fuel gets on
your clothing, change immediately.

Check for leakage. To
reduce the risk of serious
of fatal burn injuries, do
not start or run the engine
until leak is fixed.

Screw-type fuel cap

After fueling, tighten
down the screw-type fuel
cap as securely as
possible.

This reduces the risk of unit vibrations
causing the fuel cap to loosen or come
off and spill quantities of fuel.

Before Starting

Check that your power tool is properly
assembled and in good condition – refer
to appropriate chapters in the instruction
manual.

– Check the fuel system for leaks,

paying special attention to visible
parts such as the tank cap, hose
connections and the manual fuel
pump (on machines so equipped). If
there are any leaks or damage, do
not start the engine – risk of fire.
Have your machine repaired by a
servicing dealer before using it
again.

– Throttle trigger must move freely

and spring back to the idle position
when released.

– The setting lever must move easily

to STOP or 0

– The blower tubes must be properly

assembled.

– Keep the handles dry and clean –

free from oil and dirt – for safe
control of the power tool.

– Check that the spark plug boot is

secure – a loose boot may cause
arcing that could ignite leaking fuel­air mixture and cause a fire.

– Never attempt to modify the controls

or the safety devices in any way.

– Check condition of blower housing.

– Check condition of harness straps

and backpack – replace damaged
or worn straps.

A worn blower housing (cracks, nicks,
chips) may result in an increased risk of
injury from thrown foreign objects. If the
blower housing is damaged, consult
your dealer – STIHL recommends you
contact a STIHL servicing dealer.

To reduce the risk of accidents, do not
operate your power tool if it is not in a
safe condition.

For emergencies: Practice quickly
opening the fastener on the waist belt,
loosening the shoulder straps and
setting down the unit.

Start the engine.

Start the engine at least 3 meters from
the fueling spot, outdoors only.

Your power tool is designed to be
operated by one person only. Do not
allow other persons in the work area –
even when starting.

Do not drop start the power tool – start
the engine as described in the
instruction manual.

Place the power tool on level ground,
make sure you have secure footing, hold
the power tool securely.

As soon as the engine starts, the air flow
may throw small objects (e.g. stones) in
your direction.

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BR 450, BR 450 C

English

During Operation

In the event of impending danger or in
an emergency, switch off the engine
immediately by moving the setting lever
to STOP or 0.

To reduce the risk of injury from thrown
objects, do not allow any other persons
within 15 meters of your own position.

To reduce the risk of damage to
property, also maintain this distance
from other objects (vehicles, windows).

Do not direct the air blast
towards bystanders or
animals since the air flow
can blow small objects at
great speed – risk of
injury.

When blow-sweeping (in open ground
and gardens), watch out for small
animals to avoid harming them.

Never leave a running machine
unattended.

Take special care in slippery conditions
– damp, snow, ice,
on slopes and uneven ground.

Watch out for obstacles: Be careful of
refuse, tree stumps, roots and ditches
which could cause you to trip or stumble.

Never work on a ladder or any other
insecure support.

Be particularly alert and cautious when
wearing hearing protection because
your ability to hear warnings (shouts,
alarms, etc.) is restricted.

Work calmly and carefully – in daylight
conditions and only when visibility is
good. Stay alert so as not to endanger
others.

To reduce the risk of accidents, take a
break in good time to avoid tiredness or
exhaustion.

Your power tool produces
toxic exhaust fumes as
soon as the engine is
running. These fumes
may be colorless and
odorless and contain
unburned hydrocarbons
and benzol. Never run
the engine indoors or in
poorly ventilated loca­tions, even if your model
is equipped with a cata­lytic converter.

To reduce the risk of serious or fatal
injury from breathing toxic fumes,
ensure proper ventilation when working
in trenches, hollows or other confined
locations.

To reduce the risk of accidents, stop
work immediately in the event of
nausea, headache, visual disturbances
(e.g. reduced field of vision), problems
with hearing, dizziness, deterioration in
ability to concentrate. Apart from other
possibilities, these symptoms may be
caused by an excessively high
concentration of exhaust gases in the
work area.

To reduce the risk of fire, do not smoke
while operating or standing near your
power tool. Note that combustible fuel
vapor may escape from the fuel system.

If dust levels are very high, always wear
a suitable respirator.

Operate your power tool so that it
produces a minimum of noise and
emissions – do not run the engine
unnecessarily, accelerate the engine
only when working.

After finishing work, put the unit down on
a level, non-flammable surface. To
reduce the risk of fire, do not put it down
near easily combustible materials (e.g.
wood chips, bark, dry grass, fuel).

If your power tool is subjected to
unusually high loads for which it was not
designed (e.g. heavy impact or a fall),
always check that it is in good condition
before continuing work – see also
"Before Starting Work". Check the fuel
system in particular for leaks and make
sure the safety devices are working
properly. Do not continue operating your
power tool if it is damaged. In case of
doubt, consult your servicing dealer.

BR 450, BR 450 C

5

English

0009BA001 KN

Using the Blower

The machine is carried as a backpack.
Hold and control the blower tube with
your right hand on the control handle.

Walk slowly forwards as you work –
observe the nozzle outlet at all times –
do not walk backwards – risk of
stumbling.

Always shut off the engine before taking
the machine off your back.

Working Technique

To minimize blowing time, use a rake
and broom to loosen dirt particles before
you start blowing.

Recommended working technique to
minimize air pollution:

– If necessary, dampen the surface to

be cleaned in order to avoid creating
too much dust.

– Do not blow particles in the direction

of bystanders, in particular in the
direction of children, pets, open
windows or freshly washed
vehicles. Take special care in such
situations.

– Remove the blow-swept debris in

rubbish bins – do not blow it onto the
neighbor's land.

Recommended working technique to
minimize noise:

– Operate your power tool at

reasonable times only – not early in
the morning, late at night or during
midday rest periods when people
could be disturbed. Observe local
rest periods.

– Operate blowers at the lowest

engine speed necessary to
accomplish the task.

– Check your blower before starting

work. Pay special attention to the
muffler, air intakes and air filter.

Vibrations

Prolonged use of the power tool may
result in vibration-induced circulation
problems in the hands (whitefinger
disease).

No general recommendation can be
given for the length of usage because it
depends on several factors.

The period of usage is prolonged by:

– Keeping your hands warm

– Work breaks

The period of usage is shortened by:

– Any personal tendency to suffer

from poor circulation (symptoms:
frequently cold fingers, itching).

– Low outside temperatures.

– Gripping force (a tight grip hinders

circulation).

Continual and regular users should
monitor closely the condition of their
hands and fingers. If any of the above
symptoms appear (e.g. tingling
sensation in fingers), seek medical
advice.

Maintenance and Repairs

Service the machine regularly. Do not
attempt any maintenance or repair work
not described in the instruction manual.
Have all other work performed by a
servicing dealer.

STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer. STIHL dealers are

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BR 450, BR 450 C

English

1

0416BA001 KN

2

3

2

1

4

0416BA002 KN

3

regularly given the opportunity to attend
training courses and are supplied with
the necessary technical information.

Only use high-quality replacement parts
in order to avoid the risk of accidents
and damage to the machine. If you have
any questions in this respect, consult a
servicing dealer.

STIHL recommends the use of genuine
STIHL replacement parts. They are
specifically designed to match your
model and meet your performance
requirements.

To reduce the risk of injury, always shut
off the engine before carrying out any
maintenance or repairs or cleaning the
machine. – Exception: Carburetor and
idle speed adjustments.

Do not turn the engine over on the
starter with the spark plug boot or spark
plug removed since there is otherwise a
risk of fire from uncontained sparking.

Do not service or store your machine
near open flames.

Check the fuel filler cap for leaks at
regular intervals.

Use only a spark plug of the type
approved by STIHL and make sure it is
in good condition – see "Specifications".

Inspect the ignition lead (insulation in
good condition, secure connection).

Check the condition of the muffler.

To reduce the risk of fire and damage to
hearing, do not operate your machine if
the muffler is damaged or missing.

Do not touch a hot muffler since burn
injury will result.

Vibration behavior is influenced by the
condition of the AV elements – check the
AV elements at regular intervals.

Shut off the engine before rectifying
problems.

Assembling the Unit

Mounting the Hose Clamps and Pleated
Hose

N Push the hose clamp (1) (with

retainer for throttle cable) onto the
elbow (3) – the positioning marks
must face to the left.

N Push the pleated hose (2) over the

elbow (3).

N Push the hose clamp (1) onto the

pleated hose (2).

N Line up the positioning marks on the

hose clamp (1) and elbow (3) – the
screw lug faces down.

N Secure the hose clamp (1) with the

screw (4).

BR 450, BR 450 C

7