Technical Information · issue 21 of 2002
New STIHL BR 45 C Backpack Blower
IssueTI 21/2002
Full text
Page 1 of 4
Technical Information
21.2002
New STIHL BR 45 C Backpack Blower – Series 4229
Contents
1. Technical Description
2. Specifications
3. Service Accessories and
Special Servicing Tools
4. Repairs
5. Spare Parts
The new BR 45 C backpack blower is among the The powerhead is a modified version of the STIHL
quietest in its class. It is therefore particularly BG 45 C handheld blower.
suitable for applications in noise-sensitive areas,
Vibration damping is achieved by three spring
near schools, hospitals and in parks, for example.
elements between the powerhead and carrying
The new blower is equipped with the STIHL catalytic frame.
converter to reduce the amount of unburnt
With the exception of the elbow, the blowing
hydrocarbons in the exhaust.
attachment and control handle are exactly the same
as those of models BR 340 and BR 420.
TI_21_2002_02_01_01.fm english / USA
)m~ge 2 Technical Information 21.2002
1. Technical Description 2. Specifications
The engine is the "series 4140 powerhead“ already
2.1 Powerhead
used in several STIHL power tool models (e.g. BG
45, BG 55, SH 55, SH 85, FS 45, FS 55, FC 55, HS
2.1.1 Engine
45, HL 45).
Cylinder
. Four port technology (better mixture control) STIHL single cylinder two-stroke engine
Displacement: 1,66 cu. in (27,2 cm3)
. Large cooling area.
Bore: 1,34 in (34 mm)
Carburetor
Stroke: 1,18 in (30 mm)
. With 3 adjusting screws (H, L, LA), Engine power to 0.87 bhp (0.65 kW) at
H screw with limiter cap that restricts range of ISO 8893: 6,500 rpm
adjustment Idle speed: 2,800 rpm
. With manual fuel pump primer (purger)
Rewind starter: Single pawl system
Air Filter Starter rope: .120 in (3,0 mm) diameter,
41 3/4 in (1060 mm) long
. Multi-ply (felt, foam), long life
Muffler 2.1.2 Fuel System
. Two chamber muffler with catalytic converter
and spark arresting screen
Carburetor: All position diaphragm carburetor with
integral fuel pump
Fuel Tank
. Fuel filler cap can be opened and closed without Low speed screw L
tools
(standard setting): Open 1 full turn
Vibration Damping High speed screw H
. Antivibration system with three spring elements (standard setting): Open as far as stop
(max. 3/4 turn)
Fuel tank capacity: 13,5 fl. oz (0,4 l)
2.1.3 Ignition System
Ignition module: With integral electronic
governor
Spark plug
(suppressed): NGK BPMR 7 A
Electrode gap: .020 in (0,5 mm)
2.2 Weight
17,6 lb (8,0 kg)
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Technical Information 21.2002 Page 3
3. Service Accessories and
Special Servicing Tools
3.1 Service Accessories
Part Name Part No. Application
Set of gaskets 4229 007 1050 Engine
Carburetor parts kit 1129 007 1062 Carburetor
3.2 Special Servicing Tools
Special servicing tools are listed in the service
manuals for the series 4140 powerhead and
STIHL BR 340, BR 420 (blowing attachment and
control handle).
4. Repairs
If the unit is started up in the course of repair work,
it is essential to strictly observe all local and national
safety regulations and the safety precautions
outlined in the owner’s manual.
4.1 Tightening Torques
The tightening torques for the BR 45 C are listed in
the service manuals for the series 4140 powerhead
and STIHL BR 340, BR 420 (blowing attachment
and control handle).
4.2 Service Note
For servicing and repair procedures on the BR 45 C
refer to the service manuals for the series 4140
powerhead and STIHL BR 340, BR 420 (blowing
attachment and control handle). See also
"Diagnosis" in the STIHL Service Training System
available on CD-ROM.
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)m~ge 4 Technical Information 21.2002
4.3 Repair Times
The specified repair times assume that the work is Code Type of Repair BR 45 C
performed by trained personnel in a properly 1 Crankcase, Crankshaft,
equipped service workshop. Crankshaft Bearings *1.2
The repair times are given in hours 2 Replace Short Block 1.0
(0.1 = 6 minutes). 3 Crankcase Gasket/Sealing 1.0
This table for model BR 45 C can be added to the 4 Crankshaft Seals
STIHL repair timetables manual. (Includes pressure & vacuum
testing) 1.0
5 Cylinder and/or Piston 0.9
5. Spare Parts 6 Ignition Module 0.5
7 Fuel Hose 0.4
A separate illustrated parts list is available for the 8 Back Plate 0.5
new model.
9 Repair/Rebuild Carburetor 0.8
10 Replace Carburetor,
Carburetor Jet
(If tried to repair use code 9) 0.4
11 Throttle Control, Throttle Cable 0.4
12 Recoil Starter 0.5
13
Fan Housing, Fan Wheel, 0.5
Metering Pump
14 Discharge Tube, Elbow 0.3
15 Muffler 0.5
16 Air Filter, Filter Cover, Tank Cap,
Fuel Filter, Tank Vent, Spark
Plug, Shoulder Straps,
Miscellaneous Minor Repairs 0.4
17 Stop Switch 0.4
18 Fuel Tank 0.5
19 Sprayer Tank
20 All Other Repairs 0.5
50 No Labor 0.0
* Recommend to replace with short block (code 2).
© 2002 Andreas Stihl AG & Co. Technical Documentation
Waiblingen D1/MTK-tr 7631
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Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.