Technical Information · issue 9 of 2005
New version – BR 380; Modified blower unit – BR 340; Specifications – BR; Control handle – BR 340 and SR 340/420; Back padding; Shutoff cock – SR
IssueTI 9/2005
Full text
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STIH)
Technical Information 09.2005
New blower STIHL BR 380 Series 4203
Blowers STIHL BR 340, 420 Series 4203
Mistblowers STIHL SR 340, 420 Series 4203
Contents
1. New version – BR 380
2. Modified blower unit – BR 340
3. Specifications – BR
4. Control handle –
BR 340 and SR 340/420
5. Back padding
6. Shutoff cock – SR
1. New version – BR 380
The new blower STIHL BR 380 enlarges the range
of backpack blowers.
The STIHL BR 380 comprises the power unit of the
STIHL BR 420 and the blower tubes of the BR 340.
The reduced diameter of the blower tubes leads to
an increased air velocity as compared with the
BR 420. This improves the efficiency when blowing
heavy, solid material.
New blower unit for BR 340, 380 with curved nozzle,
2. Modified blower unit – BR 340 dia. 2.64 in
The blower STIHL BR 340 is equipped with a blower
tube with reduced diameter to improve its efficiency
when blowing heavy, solid material.
A higher air velocity is obtained by the reduced
diameter of the blower tube in combination with the
same power output.
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)m~ge 2 Technical Information 09.2005
Previous blower unit with straight nozzle, Previous blower unit with curved nozzle, dia. 3.15 in
dia. 3.15 in
3. Specifications – BR
BR 340 BR 380-D1) BR 420-D1)
Displacement 2.74 ci 3.45 ci 3.45 ci
(44.9 cm3) (56.5 cm3) (56.5 cm3)
Bore 1.61 in (41 mm) 1.81 in (46 mm) 1.81 in (46 mm)
Piston stroke 1.34 in (34 mm) 1.34 in (34 mm) 1.34 in (34 mm)
Idle speed 3,100 rpm 3,100 rpm 3,100 rpm
Operating speed with nozzle 7,000 rpm 7,400 rpm 7,100 rpm
Maximum air volume without tubes 689 cf/min 724 cf/min 724 cf/min
Air volume with nozzle 436 cf/min 465 cf/min 518 cf/min
Air speed with nozzle 170 mph 181 mph 172 mph
Weight 20 lbs (9.1 kg) 20.5 lbs (9.3 kg) 20.5 lbs (9.3 kg)
1)
Catalytic converter for exhaust gas
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Technical Information 09.2005 Page 3
4. Control handle –
BR 340 and SR 340/420
Left: previous version 4203 790 1306 (BR 340) and 4203 790 1304 (SR 340, 420)
Right: new version 4203 790 1305 (BR 340, 380 and SR 340, 420)
The previous control handle 4203 790 1306 The previous control handle 4203 790 1304
(dia. 3.15 in) is replaced by the control handle (dia. 2.64 in) is replaced by the control handle
4203 790 1305 (dia. 2.64 in) on the blower BR 340 4203 790 1305 (dia. 2.64 in) on the mistblowers in
in this series. this series.
The previous control handle remains available as a The new control handle can also be used on the
replacement. previous models.
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5. Back padding 6. Shutoff cock – SR
For further optimization, the padding is secured to Shutoff cock 4203 700 4500 is replaced by the
the new back plate by four rivets. The previous back shutoff cock 4203 700 4501 on the mistblowers.
padding with six press studs remains available for
replacement.
Left: previous version 4203 790 8001
Right: new version 4203 790 8003
Top: previous version 4203 700 4500
Bottom: new version 4203 700 4501
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Technical Information 09.2005 Page 5
Summary
Item Part name Previous New Remarks
Blower unit
1 Pleated hose dia. 3.15 in 4203 701 6101 --- 1) 2)
2 Pleated hose dia. 2.64 in --- 4203 701 6102 2)
3 Blower tube dia. 3.15 in 4203 708 3404 --- 1) 2)
4 Blower tube dia. 2.64 in --- 4203 708 3402 2)
5 Blower tube dia. 3.15 in ("adapter") 4203 708 3408 --- 1) 2) 3)
6 Blower tube dia. 2.64 in --- 4203 708 3400 2)
7 Nozzle dia. 3.15 in, straight 4203 708 6306 --- 1) 2) 4)
8 Nozzle dia. 2.64 in, curved --- 4203 708 6300 2) 4)
Control handle
9 Control handle dia. 3.15 in; 4203 790 1306 --- 1) 2)
including Items 12, 14, 16, 18:
10 Control handle dia. 2.64 in; 4203 790 1304 --- 5)
including Items 13, 15, 16, 18:
11 Control handle dia. 2.64 in; --- 4203 790 1305
including Items 13, 15, 17, 19:
12 Handle moulding inside dia. 3.15 in 4203 790 1104 --- 1) 2)
13 Handle moulding inside dia. 2.64 in --- 4203 790 1103
14 Handle moulding outside dia. 3.15 in 4203 791 0810 --- 1) 2)
15 Handle moulding outside dia. 2.64 in --- 4203 791 0808
16 Throttle trigger 4203 182 1002 --- 1)
17 Throttle trigger --- 4203 182 1003
18 Slide 4203 430 0101 --- 1)
19 Slide --- 4203 430 0102
Back padding
20 Back padding 4203 790 8001 --- 1)
21 Back padding; --- 4203 790 8003
including Item 22:
22 Rivet 5.9x17 (set of 4) --- 0751 030 7651
Shutoff cock
23 Shutoff cock 4203 700 4500 4203 700 4501 5)
Remarks
1) Previous version of part remains available
2) BR 340
3) Previous version of blower unit dia. 3.15 in with curved nozzle
4) Previous version of blower unit dia. 3.15 in with straight nozzle
5) SR 340, 420
Last Technical Information on the STIHL BR/SR: 30.2003
© ANDREAS STIHL AG & Co. KG, 2005 Technical Documentation
D1/MTK-ru
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