SR430-SR450 Service Manual.pdf

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STIH)
STIHL SR 430, 450
2009-06
Contents
1.
1.1
1.2
2.
2.1
2.2
2.3
2.4
3.
3.1
3.2
3.3
3.4
3.5
4.
4.1
4.2
4.2.1
4.2.2
4.2.3
4.3
4.4
4.5
4.6
4.7
4.8
4.8.1
Introduction and
Safety Precautions
Introduction
Safety Precautions
Specifications
Engine
Fuel System
Ignition System
Tightening Torques
Troubleshooting
Rewind Starter
Blower
Ignition System
Carburetor
Engine
Engine
Muffler / Spark
Arresting Screen
Leakage Test
Preparations
Vacuum Test
Pressure Test
Oil Seals
Shroud
Engine
Cylinder / Crankshaft
Bearings / Crankshaft
Piston
Piston Rings
5.
3
3
4
5
5
5
5
6
8
8
9
10
12
15
16
16
17
17
18
18
19
19
20
22
25
26
29
6.
6.1
6.2
6.3
6.4
6.5
6.6
6.7
5.1
5.2
5.3
5.4
5.5
5.6
5.6.1
5.6.2
5.6.3
5.7
Ignition System
Ignition Timing
Ignition Module
Testing
the Ignition Module
Spark Plug Boot
Flywheel
Short Circuit Wire
Testing
Removing and
Installing
Ground Wire
Ignition System
Troubleshooting
Rewind Starter
General
Starter Cover
Pawl
Rope Rotor
Starter Rope / Grip
Tensioning the
Rewind Spring
Replacing the
Rewind Spring
Servicing the
AV System
AV Springs at Rear
of Backplate
AV Springs at Bottom
of Backplate
AV Springs on
Backplate, Metering
Unit, SR 450
Stop Buffer on Filter
Housing
Stop Buffer on Shroud
30
30
30
32
33
34
35
35
35
38
39
42
42
42
42
43
44
45
46
8.
8.1
8.2
8.3
8.4
8.5
8.5.1
9.
9.1
9.2
9.3
9.4
9.5
9.5.1
9.6
9.6.1
9.6.2
9.6.3
9.6.4
9.6.5
9.6.6
9.6.7
9.7
9.7.1
9.7.2
9.8
9.8.1
9.9
9.10
9.10.1
9.10.2
9.10.3
9.11
9.11.1
9.11.2
9.11.3
9.12
9.12.1
Control Levers
Switch Positions
Setting Lever
Throttle Trigger/
Interlock Lever
Valve Lever
Metering Lever,
SR 450
Adjusting the Cable
Fuel System
51
51
51
52
55
56
57
58
7.
7.1
7.2
7.3
7.4
7.5
48
48
49
49
50
50
RA_454_00_01_01
Air Filter
58
Baffle
58
Air Guide Shroud
59
Filter Housing
59
Removing and Installing
the Carburetor
62
Leakage Test
63
Servicing
the Carburetor
64
Metering Diaphragm 64
Inlet Needle
65
Fixed Jet
66
Pump Diaphragm
66
Throttle Lever
67
Rotary Knob
68
Adjusting Screws
69
Adjusting the
Carburetor
70
Basic Setting
70
Standard Setting
71
Throttle Cable
72
Adjusting the Throttle
Cable
72
Spacer Flange
73
Tank Vent
74
Testing
74
Removing and
Installing
75
Manual Fuel Pump
75
Fuel Intake
76
Pickup Body
76
Fuel Hoses
77
Connector
79
Fuel Tank
80
Fuel Tank Cap
81
q
© ANDREAS STIHL AG & Co. KG, 2009
SR 430, SR 450
1
Contents
10.
10.1
10.2
10.3
10.4
10.5
10.6
10.7
10.8
10.9
10.9.1
10.9.2
10.10
10.10.1
10.10.2
10.10.3
11.
11.1
11.2
11.3
11.4
12.
Blower and Metering
Attachment
82
Container, SR 430
82
Container, SR 450
83
Metering Unit, SR 450 84
Cable, SR 450
87
Pressure Pump
89
Blower Wheel
90
Blower Housing,
SR 430
91
Blower Housing,
SR 450
95
Nozzle / Valve
98
Nozzle
98
Valve
99
Blower Tube
101
Pleated Hose
101
Elbow
101
Hoses
102
Backplate
Backplate, SR 430
Backplate, SR 450
Harness
Back Padding
Special Servicing
Tools
Servicing Aids
103
103
103
105
106
107
109
13.
2
SR 430, SR 450
1.
Introduction and Safety Precautions
1.1
Introduction
This service manual contains
detailed descriptions of all the repair
and servicing procedures specific to
this power tool.
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.
A fault on the machine may have
several causes. To help locate the
fault, consult the chapter on
"Troubleshooting" and the
"STIHL Service Training System"
for all assemblies.
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.
The special tools mentioned in the
descriptions are listed in the chapter
on "Special Servicing Tools" in 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.
Symbols are included in the text and
pictures for greater clarity.
The meanings are as follows:
In the descriptions:
N
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
Preparations for servicing
Always use original STIHL
replacement parts.
They can be identified by the STIHL
part number, the
{
logo
and the STIHL parts symbol
K
This symbol may appear alone on
small parts.
Storing and disposing of oils
and fuels
Collect fuel or lubricating oil in a
clean container and dispose of it
properly in accordance with local
environmental regulations.
–
In the illustrations:
A
Pointer
a
Direction of movement
@
4.2 =Reference to another
chapter, i.e. chapter 4.2
in this example.
Service manuals and all technical
information bulletins are intended
exclusively for the use of properly
equipped repair shops. They must
not be passed to third parties.
SR 430, SR 450
3
1.2
Safety Precautions
If the machine 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 instruction manual.
Gasoline is an extremely flammable
fuel and can be explosive in certain
conditions.
Always wear suitable protective
gloves for operations in which
components are heated for
assembly or disassembly.
Improper handling may result in
burns or other serious injuries.
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.
Always perform leakage test after
working on the fuel system and the
engine.
Always replace damaged parts.
Check disassembled parts for wear
or damage before re-installing –
replace as necessary.
Run the machine only with the
shroud mounted in position – there
is otherwise a risk of injury from the
flywheel and a risk of engine
damage due to overheating.
The chapter on tightening torques
lists all machine components that
have to be tightened to a specific
torque. The specifications must be
maintained when tightening down
screws, nuts and other fasteners in
all the procedures described in this
service manual.
Fuel system
–
hose barb
connectors
Pull off or push on fuel hoses in line
with the connector, preferably by
hand, to ensure the tightness of the
fuel system.
Avoid damaging the hose barb
– do not use sharp-edged pliers,
screwdrivers, etc.
Do not cut open fuel hoses with a
knife or similar tool.
Do not re-use fuel hoses after
removal. Always install new hoses
– fuel hoses can be overstretched
during removal.
Install new fuel hoses either dry or
with the aid of STIHL press fluid,
b
13.
Other press fluids are not approved
and may result in damage to the fuel
hoses.
Coat the ends of the hoses and the
connectors with STIHL press fluid
and then push the new hoses on to
the hose barbs,
b
13.
4
SR 430, SR 450

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