Stihl 4282 Series Manual

STIH)

Technical Information

TI_08_2005_11_01_02.fm englisch / English

New STIHL BR 500, BR 550 and BR 600 backpack blowers – Series 4282

Contents

1. Technical description

2. Specifications

3. Accessories

4. Service accessories and special tools

5. Service notes

08.2005

Page 2 Technical Information 08.2005

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The new STIHL BR 500, BR 550 and BR 600

backpack blowers are three ideal models for

demanding, professional users.

The BR 500 is especially low-noise yet highly

powerful for use in noise-sensitive areas.

The BR 550 has an attractive price with far above-

average blowing strength.

The BR 600 is particularly powerful - one of the

strongest blowers in the world.

The STIHL 4-MIX engine of the new blowers sets

benchmarks in blowing strength, economy and

environmental friendliness.

Comfort is increased with the simplified starting

procedure. This is realised with the newly designed

control handle and central control section that holds

all operating elements required for starting.

Another innovation is the electrostatic arrester in the

blowing system that protects the user from

electrostatic shock.

The devices are equipped with an adjustable

carrying system with breathing padding for superior

wearing comfort.

The holder for the blowing system makes the

devices easier to transport and saves space in

storage.

1. Technical description

1.1 Blowing system with electrostatic

arrester

The extremely high flow of air from the new blowers

generates friction in the blower tubes. The friction

can build up an electrostatic charge.

The arrester in the blower tube creates a conductive

link to the engine block to prevent the build up of

electrostatic charges that can lead to sparkover.

.Before starting the blower, check to see if it is

intact and seated correctly. If the arrester is

damaged, replace it (see 5.6).

.Never operate the machine without an arrester.

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1.2 Control handle

For simplified starting, the choke does not have to

be set on the control handle.

Since the setting lever does not lock at

"Engine Stop" (0), the ignition system is

continuously ready to operate, and the blower can

be started at any time.

.Setting lever (1)

.Throttle trigger (2)

Engine stop (0)

.The ignition system is sent a stop pulse to shut

off the blower.

.The setting lever does not lock but rather

springs back – the ignition system is

automatically ready to operate.

Operating position (#)

.The engine is running or can start – the throttle

trigger can be smoothly actuated.

Set locked position (C)

.The throttle trigger can be locked at three levels:

1/3 gas, 2/3 gas and full throttle.

.To release the locked position, set the setting

lever to #.

1.3 Simplified starting

All operating elements for starting are on a central

control area. Set the starting throttle position with

the choke knob. The choke knob automatically

springs back into operating position after the throttle

trigger is actuated.

.Press the fuel pump bulb at least five times.

.Setting the choke knob:

When the engine is cold l

When the engine is hot n

.Pull the cord until the engine starts; at the latest,

set the choke knob to starting throttle position

nafter the third time the cord is pulled.

.Set the choke knob to the starting throttle

position n

.Continue cranking until the engine runs.

To switch to idle:

.Pull the throttle trigger - the choke knob

automatically jumps to operating position #

.Set the choke knob manually to #

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1.4 Blower holder

For storage and transport:

.Affix the Velcro tape to the blower tube, pull the

tab through the cinch.

.Affix the blower tube to the handle opening of

the back plate.

1.5 STIHL 4-MIX engine

The 4-MIX engine works with mixed lubrication.

Unlike a conventional four-stroke engine, the 4-MIX

engine does not have any supply of oil in the

crankcase. The engine is lubricated entirely with a

mixture of petrol and engine oil.

This design yields the following advantages:

.Same fuel

.Lower fuel consumption

.Can be operated in all positions

.Fewer emissions

.Good acceleration

.Compact size – attractive design

.Advantageous power-to-weight ratio

.Easy maintenance – easy to service

.Pleasanter sound – lower noise level

.Fewer vibrations

.Lower starting force

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1.5.1 Engine design

Single-cylinder engine with overhead valves.

Cylinder head, cylinder and upper half of crankcase

have been combined into a single unit.

The crankcase is horizontally split along the

crankshaft.

1.5.2 Engine control

.Overhead valves (OHV), one exhaust valve (1)

and one inlet valve (2)

.Valve control via crankshaft gear (3),

cam disk (4), lever (5), pushrod (6) and

rocker arm (7)

.Crossflow scavenging

(= inlet and exhaust on opposite sides)

254TI011 KN

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1.5.3 Engine lubrication

The engine is lubricated in two phases during each

revolution of the crankshaft.

Phase 1

The piston rises to the top dead centre.

The increase in volume in the crankcase produces

a vacuum. From the intake duct (1), the air-fuel-oil

mixture is drawn through the bypass port (2), valve

train (3) and timing gear (4) into the crankcase (5).

The oil contained in this mixture lubricates the

crankgear, timing gear, valve train and cylinder wall.

Phase 2

The piston descends to the bottom dead centre.

Excess pressure builds up in the crankcase due to

the decrease in volume.

The mixture of air, fuel and oil in the crankcase is

returned to the intake duct via the timing gear, valve

train and bypass bore. This rewets the lubrication

points.

Technical Information 08.2005 Page 7

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1.6 Decompression system

The automatic decompression system reduces the

compression upon starting and hence the required

pull on the starter rope.

Cam disk at low speed (starting):

.Decompression cam (1) projects and actuates

the lever (2)

.This lengthens the valve opening time, which

reduces the compression

Cam disk when the engine has started:

.The centrifugal mechanism retracts the

decompression cam (1) – this cancels the effect

of the decompression cam

1.7 Carburetor

.All-position diaphragm carburetor with

independent idle

.The range of the high-speed adjusting screw (H)

and the low-speed adjusting screw (L) is limited

by limiter caps (approx. 3/4 turn). This limitation

ensures greater operating safety and

maintenance of future exhaust emission levels

.Accelerator pump for faster and spontaneous

acceleration (see 5.3).

.Choke knob with integrated starting throttle

position

1.8 Ignition system

.Microprocessor-controlled with ignition timing

adjustment

.Low power-up threshold

1.9 Air filter

.Large-area paper air filter for long filter service

life

.Easily accessible

1.10 Muffler

.Two-chamber muffler with spark arresting

screen, depending on the market concerned.

1.11 Flywheel

.Weight-optimised geometry

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2. Specifications

2.1 Engine

2.2 Fuel system

Carburetor

All-position diaphragm carburetor with limiter caps

on the high-speed adjusting screw (H) and the low-

speed adjusting screw (L) and integrated fuel pump.

Standard setting with limiter caps

Basic setting without limiter caps

Fuel tank capacity

1.4 l (1400 cm³)

2.3 Ignition system

BR 500 BR 550 BR 600

Displacement 64.8 cm3

Cylinder bore 50 mm

Piston stroke 33 mm

Idle speed 2,500 rpm

Operating speed with nozzle 5,500 rpm 6,100 rpm 7,200 rpm

Maximum air flow 1,380 m³/h 1,490 m³/h 1,720 m³/h

Air flow with nozzle 810 m³/h 900 m³/h 1,210 m³/h

Air velocity 81m/s 89 m/s 90 m/s

Sound pressure level Lpeq according

to EN ISO 11201 1)

86 dB(A) 92 dB(A) 96 dB(A)

Sound power level Lweq according

to ISO 37441)

95 dB(A) 103 dB(A) 105 dB(A)

Vibration acceleration aeq

to ISO 86621)

Idle speed 1.7 m/s21.5 m/s21.7 m/s2

at max. RPM 1.4 m/s21.6 m/s21.8 m/s2

Weight 9.9 kg 9.7 kg 9.5 kg

1) Weighted equivalent level includes idling, full load and racing with the same duration of exposure

Low-speed adjusting screw L: 3/4 turn open

(max. to stop)

High-speed adjusting screw H: 3/4 turn open

(max. to stop)

Low-speed adjusting screw L: 2 turn open

High-speed adjusting screw H: 3 1/2 turn open

Ignition module: Microprocessor-

controlled with

adjustment of the

ignition timing

Spark plug (suppressed): NGK CMR 6 H

Electrode gap: 0.7 mm

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3. Accessories

4. Service accessories and special

tools

4.1 Service accessories

Part name Part number Use

Nozzle 4282 708 6300 Straight nozzle for BR 500, BR 550

Nozzle 4282 708 6310 Straight nozzle for BR 600

Nozzle 4282 708 6320 Bent nozzle for BR 500, BR 550

Nozzle 4282 708 6330 Bent nozzle for BR 600

Hip belt 4282 710 9100 BR 500, BR 550, BR 600

Part name Part number Use

Grease (225 g tube) 0781 120 1111 Oil seals, oil pump drive, sprocket bearings, chain tensioner

Bearing and sliding surfaces for throttle trigger, brake lever

and trigger interlock

STIHL special lubricant 0781 417 1315 Bearing bore in rope rotor, rewind spring in fan housing

STIHL Press Fluid OH 723 0781 957 9000 Rubber elements

Standard commercially

available CFC and HFC-free

solvent-based degreasing

agent

Cleaning crankshaft stub and cone on flywheel

Sealing compound

Dirko HT red sealant

0783 830 2000 Engine pan, oil seals (outside diameter)

Set of parts for adjusting

valve clearance

4282 007 1001

Set of gaskets 4282 007 1010

Page 10 Technical Information 08.2005

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4.2 Special servicing tools

To be procured for the first time for the STIHL

BR 500, 550, 600:

The available special tools are listed in the repair

instructions for the STIHL BR 500, 550, 600.

4.2.1 Stop screw

When servicing, always use stop screw

4282 890 2700.

Stop screw 4180 890 2700 can cause damage to

the piston and crankgear with the 4282.

In the future, stop screw 4180 890 2700 will be

replaced by stop screw 4282 890 2700. Stop screw

4282 890 2700 can also be used for the 4180.

4.2.2 Assembly tool

Use assembly tool 5910 890 2212 for inserting the

snap ring between the piston and piston pin.

The assembly tool must be combined with the new

sleeve 5910 893 1704 for the 4282.

Part name Part number Use

Stop screw 4282 890 2700 Block crankshaft

Sleeve 5910 893 1704 Fit hookless snap rings in piston

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