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PB-251
Echo PB-251 Service Manual
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PB-251
BLOWER SYSTEM
37
6 BLOWER SYSTEM
(
A
)
Fan case grid
(
B
)
Outer fan case
(
C
)
Fan
(
D
)
Inner fan case
(
E
)
Bolwer pipe fixture
(B)
(A)
(E)
(C)
(D)
38
40
Table of Contents
Default Chapter
3
Table of Contents
3
1 Service Information
4
Specifications
4
Technical Data
5
Torque Limits
6
Special Repairing Materials
6
Service Limits
7
Special Tools
8
2 Starter System
9
Removing Starter Drum and Rope
9
Installing Rewind Spring
11
Installing Starter Drum and Rope
12
Increasing Rope Tension
13
Replacing Starter Pawl
13
3 Ignition System
15
Troubleshooting Guide
16
Testing Spark
17
Checking Spark Plug
17
Replacing Spark Plug Cap and Coil
18
Checking Coil Resistance
18
Checking Ignition Switch
19
Replacing Ignition Switch
19
Replacing Ignition Coil
21
Setting Pole Shoe Air Gaps
21
Checking Flywheel and Key
21
4 Handle and Control System
23
Disassembling Handle and Throttle Control
24
Reassembling Handle and Throttle Control
25
5 Fuel System
27
Cleaning Air Filter
28
Checking Fuel Cap and Fuel Strainer
28
Checking Fuel Tank and Tank Vent
29
Replacing Fuel Line, Tank Vent Line and Grommet
30
Adjusting Carburetor
31
Testing Carburetor
33
Checking Crankcase Pulse Passage
34
Checking Metering Lever
34
Checking Inlet Needle Valve
35
Checking Diaphragm and Others
35
Replacing Carburetor
36
6 Blower System
39
Disassembling Fan and Fan Case
40
Reassembling Fan and Fan Case
40
7 Engine
41
Testing Cylinder Compression
42
Cleaning Cooling Air Passages
42
Checking Muffler and Exhaust Port
43
Testing Crankcase and Cylinder Sealings
44
Replacing Oil Seal
45
Checking Cylinder
45
Checking Piston and Piston Ring
46
Replacing Needle Bearing
46
Disassembling Crankcase
47
Replacing Ball Bearings
47
Assembling Crankshaft and Crankcase
48
Installing Piston
48
Installing Piston Ring and Cylinder
49
Installing Engine to Inner Fan Case
50
8 Maintenance Guide
51
Service Intervals
51
Troubleshooting Guide
52
Disassembly Chart
54
Index
55
Other manuals for Echo PB-251
Operator's Manual
146 pages
Service Data
8 pages
5
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Echo PB-251 Specifications
General
Engine Displacement
25.4 cc
Air Speed
170 mph
Noise Level
70 dB(A)
Type
Handheld
Power Source
Gasoline
Fuel Capacity
16.9 fl oz
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