BR340-BR420 Service Manual.pdf

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Contents
1
2
3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
4
4.1
4.2
4.3
4.4
5
5.1
5.2
5.3
5.3.1
5.3.2
5.4
5.5
5.5.1
5.5.2
5.6
5.6.1
5.6.2
5.7
Introduction
Safety Precautions
Specifications
Engine
Fuel System
Ignition System
Spraying Attachment
Metering Unit
Weights
Sound Pressure Level
Tightening Torques
Troubleshooting
Engine
Ignition System
Rewind Starter
Fuel System
Engine
2
3
4
7
7.1
7.2
7.3
7.4
Rewind starter
32
11.4
11.5
4
4
5
5
5
6
6
7
9
7.5
7.6
7.7
7.8
8
8.1
Routine Maintenance 32
Removing and Installing
the Rope Rotor
33
Replacing the
Starter Rope
34
Replacing the
Rewind Spring
34
Tensioning the
Rewind Spring
35
Replacing the Pawl
36
Replacing the Rope
Guide Bush
36
Starter Cup
37
AV System
AV Elements
Throttle Control
Replacing the Throttle
Cable
Contact Spring and
Slide Control
Setting Lever
Adjusting the
Throttle Cable
Fuel System
37
37
38
38
41
42
43
44
Vacuum Attachment
(Special Accessory)
Metering Unit
(Mistblower)
Special Servicing
Tools
Servicing Aids
60
60
12
62
64
13
9
10
11
12
15
9
9.1
9.2
9.3
9.4
Removing and Installing
the Muffler
15
Exposing the Cylinder 16
Cylinder and Piston
16
Removing
16
Installing
17
Piston Rings
20
Crankcase
20
Removing the
Crankshaft
20
Installing the
Crankshaft
22
Crankcase Leakage
Test
24
Pressure Test
24
Pressure Test
25
Replacing the Oil
Seals
26
Ignition System
26
10
10.1
10.2
10.3
10.4
10.5
10.6
10.7
10.8
11
Air Filter
44
Leakage Testing the
Carburetor
44
Removing and Installing
the Carburetor
45
Servicing the
Carburetor
46
Adjusting the
Carburetor
51
Tank Vent
52
Pickup Body
53
Fuel Tank, Fuel Hose 54
Spraying
Attachment
6
6.1
6.2
6.3
6.4
6.4.1
6.4.2
6.5
Spark Plug
27
Spark Plug Boot
28
Ignition Lead
29
Ignition Module
29
Ignition Timing
30
Removing and Installing30
Flywheel
31
55
55
56
56
57
59
11.1
11.2
Container
Pressure Pump
(Special Accessory)
11.2.1 Removing and
Installing
11.2.2 Disassembling and
Reassembling
11.3
Fanwheel
q
© 2001 Andreas Stihl AG & Co., Waiblingen
BR 340, BR 420, SR 340, SR 420
1
1
Introduction
This service manual contains
detailed descriptions of all the repair
and servicing procedures on model
BR 340, 420 and SR 340, 420
blowers/sprayers.
As the design concept of models
BR 340, 420 and SR 340, 420 is
almost identical, the descriptions
and servicing procedures in this
manual generally apply to all
models. Differences are described
in detail.
Where applicable, reference is
made to the relevant chapter in the
"Carburetors" handbook for
servicing the carburetor or its
components.
You should make use of the
illustrated parts lists while carrying
out repair work. They show the
installed positions of the individual
components and assemblies.
Refer to the latest edition of the
relevant parts list to check the part
numbers of any replacement parts.
Parts lists on microfiche and
CD-ROM are always more up to
date than printed lists.
A fault on the machine may have
several causes. To help locate the
fault, consult the troubleshooting
charts -
see 4.
Refer to the "Technical Information"
bulletins for engineering changes
which have been introduced since
publication of this service manual.
Technical information bulletins also
supplement the parts list until a
revised edition is issued.
Symbols are included in the text and
pictures for greater clarity.
The meanings are as follows:
In the descriptions:
:
= Action to be taken as
shown in the illustration
(above the text)
– = Action to be taken that is
not shown in the illustration
(above the text)
+
= Situation applies from
serial number
*
= Situation applies up to
serial number
M 10x25
1
Servicing and repairs are made
considerably easier if the blower/
sprayer is mounted to assembly
stand (2) 5910 890 3100 with the
aid of clamping plate (1)
5910 890 2100.
To mount it, remove the rewind
starter and shroud,
see 5.1,
and
screw the clamping plate to the
blower/sprayer. Pack the clamping
plate with washers so that it does
not touch the fuel tank.
When the blower/sprayer is
mounted to the chainsaw assembly
stand by way of the clamping plate,
it can be swivelled to the best
position for the ongoing repair. This
leaves both hands free.
Always use original STIHL
replacement parts.
They can be identified by the
STIHL part number,
the
STIH)
logo and the
STIHL parts symbol
(
This symbol may appear alone on
small parts.
In the illustrations:
Pointer
Direction of movement
Service manuals and all technical
Information bulletins are intended
exclusively for the use of STIHL
servicing dealers. They must not be
passed to third parties.
2
BR 340, BR 420, SR 340, SR 420
372RA001
VA
The special servicing tools
mentioned in the descriptions are
listed in a chapter of this manual.
Use the part numbers to identify the
tools in the "STIHL Special Tools"
manual.
The manual lists all special
servicing tools currently available
from STIHL.
2
M 5x30
(3x)
2
Safety Precautions
If the engine is started up in the
course of repairs or maintenance
work, observe all local and country-
specific safety regulations as well
as the safety precautions and
warnings in the owner’s manual.
Gasoline is an extremely flammable
fuel and can be explosive in certain
conditions.
Improper handling may result in
burns or other serious injuries.
Warning!
Do not smoke or bring any fire,
flame or other source of heat near
the fuel. All work with fuel must be
performed outdoors only. Spilled
fuel must be wiped away
immediately.
BR 340, BR 420, SR 340, SR 420
3
3
Specifications
3.1
Engine
STIHL single cylinder two-stroke engine with special impregnated cylinder bore
BR 340, 340 L, SR 340
Displacement:
Bore:
Stroke:
Engine power:
Idle speed:
Max. permissible engine speed:
Bearings:
Piston pin diameter:
Rewind starter:
Pawls:
Reserve pull on rope rotor:
Starter rope:
Crankcase leakage test
at gauge pressure:
under vacuum:
BR 420, 420 C, SR 420
44.9 cm³
56.5 cm³
41 mm
46 mm
34 mm
34 mm
2.0 kW (2.7 bhp) - BR 340, SR 340
2,5 kW (3.4 bhp) - BR 420, SR 420
1.4 kW (1.9 bhp) - BR 340 L
2.4 kW (3,2 bhp) - BR 420 C
3,100 rpm
3,100 rpm
Exact rpm cannot be given because power is constantly absorbed by the
fanwheel
Crankshaft supported in heavy-duty deep groove ball bearings,
needle cages on small and big ends
10 mm
10 mm
Pawl engagement with automatic
Pawl engagement with automatic
starter rope rewind
starter rope rewind
Single pawl system
Single pawl system
min. �½ turn
min. �½ turn
3.5 mm dia., 960 mm
3.5 mm dia., 960 mm
0.5 bar
0.5 bar
0.5 bar
0.5 bar
3.2
Fuel System
All positon diaphragm carburetor with integral fuel pump and mixture control
via compensator
Open approx. 1 turn
Open approx. 1 turn
Carburetor:
Standard setting
High speed screw H:
Low speed screw L:
Carburetor leakage test
at gauge pressure:
Fuel tank capacity:
Octane rating:
Fuel mixture:
Mix ratio:
Air filter:
0.8 bar
1.5 L
min. 90 RON
Regular brand name gasoline
and two-stroke engine oil
50:1
with STIHL two-stroke engine oil
25:1
with other brand name two-stroke, air-cooled engine oils
Paper element with prefilter
4
BR 340, BR 420, SR 340, SR 420
3.3
Ignition System
Electronic magneto ignition
0.2 – 0.3 mm
Bosch WSR 6 F or NGK BPMR 7 A
0.5 mm
M14x1.25; 9.5 mm long
Type:
Air gap:
Spark plug (suppressed):
Electrode gap:
Spark plug thread:
3.4
Spraying Attachment
BR 340
BR 340 L
BR 420,
BR 420 C
1060 m³/h
80 m/s
SR 340
SR 420
Max. air flow rate:
Air velocity:
Container capacity:
Size of filler strainer mesh:
Liquid discharge rate:
(infinitely variable)
Quantity left in container:
(design related)
1000 m³/h
72 m/s
870 m³/h
65 m/s
1000 m³/h
92 m/s
14 l
1 mm
0.15–2.8 l/m
0.1 l
1060 m³/h
101 m/s
14 l
1 mm
0.15–3.0 l/m
0.1 l
3.5
Metering Unit
SR 340
SR 420
Discharge rate without pressure pump
1)
in metering knob position:
1
2
3
4
5
6
Discharge rate with pressure pump
1)
using metering nozzle:
1
2
3
0.13 l/min
0.61 l/min
1.27 l/min
1.92 l/min
2.45 l/min
2.78 l/min
0.14 l/min
0.71 l/min
1.33 l/min
2.09 l/min
2.67 l/min
3.03 l/min
0.53 l/min
1.42 l/min
2.44 l/min
0.57 l/min
1.54 l/min
2.62 l/min
Quantities quoted are average discharge rates for spray tube angles of 0° and 30° to the horizontal at full
throttle
1)
BR 340, BR 420, SR 340, SR 420
5

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