STIH) Technical Information TI_12_2015_30_01_01.fm englisch / English New Backpack Blowers STIHL BR 450, BR 450 C-EF – Series 4244 Overview 1. Product description 2. Repairs and service 2.1 Setting the carburetor (pre-checks) 3. Electric start 3.1 Special tools 3.2 Starter BR 450 C-EF: 3.3 Cable routing 3.4 Diagnostic procedure electric start BR 450 C-EF 3.5 Repair times 1. Product description The new backpack blowers STIHL BR 450 und BR 450 C-EF broaden the product range of blowers for professional use. Engine and carrying system were adopted from the blowers STIHL BR 350 und BR 430. Distinguishing features: – New fan housing and fanwheel – New blower tubes with stepless length adjustment – New tooless adjustable control handle with stepless cruise control – Supplementary equipment of BR 450 C-EF: electric start 12.2015
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STIH)
Technical Information 12.2015
New Backpack Blowers STIHL BR 450, BR 450 C-EF – Series 4244
Overview
1. Product description2. Repairs and service
2.1 Setting the carburetor (pre-checks)3. Electric start
3.1 Special tools3.2 Starter BR 450 C-EF:3.3 Cable routing3.4 Diagnostic procedure electric start BR 450 C-EF3.5 Repair times
1. Product description
The new backpack blowers STIHL BR 450 und BR 450 C-EF broaden the product range of blowers for professional use.
Engine and carrying system were adopted from the blowers STIHL BR 350 und BR 430.
Distinguishing features:
– New fan housing and fanwheel
– New blower tubes with stepless length adjustment
– New tooless adjustable control handle with stepless cruise control
– Supplementary equipment of BR 450 C-EF:electric start
TI_12_2015_30_01_01.fm englisch / English
Page 2 Technical Information 12.2015
2. Repairs and service
2.1 Setting the carburetor (pre-checks)
. Check air filter and replace it if necessary.
. Check the spark arresting screen and clean or replace it if necessary.
. Check setting of throttle cable:
. Set throttle lever to full throttle position.
. Turn the screw in the throttle lever until initial resistance is encountered. Then an additional half turn.
In full throttle position, the lever of the throttle shaft (arrow) must contact the carburetor housing.
2.1.1 Standard setting with limiter caps:
2.1.2 Standard setting without limiter caps:
. Set speed (tolerance range +/- 200 rpm):
– Idle speed: 3,000 rpm
– Maximum speed: 7,000 rpm
3. Electric start
The BR 450C-EF is equipped with an electric start system which consists of the following components:
– Control module with built-in battery
– Starter with starter motor and starter gearbox
– Control handle with start button
The battery drives the starter motor which winds a spring in the starter gearbox. When enough tension is developed in the spring to overcome the engine compression, the engine is started.
When the engine is running, the generator charges the battery.
The battery is integrated into the control module and cannot be replaced separately.
If the unit is stored at temperatures below 32°F (0°C), it may cool down to an extent that it cannot be started electrically in order to protect the battery - in this case, the unit must be started manually.
.
High speed adjustment screw H
Turn it counterclockwise as far as possible – max. 3/4 turn
Low speed adjustment screw L
1 turn open
002T
I060
ST
0014
TI01
6 AS
High speed adjustment screw H
1 1/2 turns open
Low speed adjustment screw L
1 turn open
TI_12_2015_30_01_01.fm
Technical Information 12.2015 Page 3
3.1 Special tools
The following special tools are required for STIHL blower BR 450 C-EF service.
– Diagnostic cable 0000 440 0800
– Test lead wiring harness 5910 840 0905
– Power adapter 5910 400 8500
3.2 Starter BR 450 C-EF:
The starter must be disassembled in order to replace the starter rope or the rewind spring.
3.2.1 Removing the electric start
. Remove the shroud with starter
. Pull the cables (1) and (2) out of the guides.
. Remove screw (3).
. Press in locking pin (4).
. Push out starter (5).
2
4
1
5P5x18 3(4 Nm)
0014
TI00
03 A
S
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Page 4 Technical Information 12.2015
3.2.2 Disassemble the electric start
. Remove screw (1).
. Pull the cables of the electric motor (11) out of the guides.
. Remove the bearing shell (2).
. Remove the electric motor (11).
. Remove spring (3).
. Remove carrier (6) with washer (4) and pawls (5).