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CS-420ES
Echo CS-420ES Service Manual
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11
ST
ARTER SYSTEM
CS-370ES
CS-420ES
6. Install pawl catcher
, assembling power spring
hook (J) into pawl catcher hole (I).
F
2-3
Assembling starter (continued)
4. Check for proper engagement of rewind spring
and rope reel by turning rope reel (F) clockwise and
counterclockwise.
5. Install power spring assembling hook (G) of power
spring into rope reel cutout (H).
G
H
J
I
12
14
Table of Contents
Table of Contents
3
Service Information
4
Specifications
4
Technical Data
5
Torque Limits
6
Special Repairing Materials
6
Service Limits
7
Special Tools
8
Starter System
9
Disassembling Starter Assembly
10
Replacing Starter Rope
11
Assembling Starter
12
Replacing Starter Pawl
14
Ignition System
16
Troubleshooting Guide
17
Testing Spark
18
Inspecting Spark Plug
18
Inspecting Ignition Switch
19
Replacing Ignition Switch
19
Inspecting Ignition Coil Resistance
20
Replacing Spark Plug Cap and Coil
20
Replacing Ignition Coil
21
Setting Pole Shoe Air Gaps
21
Inspecting Flywheel and Key
22
Fuel System
23
Inspecting Air Filter
24
Inspecting Fuel Cap and Strainer
24
Replacing Purge Bulb
25
Inspecting Fuel Tank and Line
26
Inspecting and Replacing Tank Vent
27
Replacing Fuel Line, Fuel Tank Vent Assembly and Grommet
28
Adjusting Carburetor
29
General Adjusting Rules
29
Presetting Idle Adjust Screw, L Mixture Needle and H Mixture Needle
29
Adjusting Carburetor
31
Positioning Plug of Air Cleaner Cover
32
Testing Carburetor
33
Inspecting Crankcase Pulse Passage
33
Inspecting Metering Lever Height
34
Inspecting Inlet Needle Valve
34
Replacing Welch Plug
35
Installing Diaphragm
35
Installing Carburetor
36
Clutch System
37
Inspecting Clutch Parts
37
Replacing Clutch Parts
38
Installing Clutch Assembly
38
Saw Chain Lubrication System
39
Inspecting Oil Cap and Strainer
39
Inspecting Oil Line
40
Inspecting Oil Tank Vent
40
Replacing Oil Line and Grommet
41
Disassembling Auto-Oiler Assembly
42
Replacing V-Ring
43
Assembling Auto-Oiler Parts
44
Engine
45
Testing Cylinder Compression
46
Cleaning Cooling Air Passage
46
Inspecting Muffler and Exhaust Port
47
Testing Crankcase and Cylinder Sealing
47
Removing Engine Block
48
Inspecting Cylinder
49
Inspecting Piston and Piston Ring
49
Inspecting Crankcase and Crankshaft
50
Replacing Oil Seal and Ball Bearing
50
Installing Piston and Piston Ring
51
Installing Piston into Cylinder
52
Installing Engine Block
53
Chain Brake System
54
Disassembling Chain Brake
54
Assembling Brake Parts
55
Rear Handle and Control System
56
Replacing Throttle Latch
57
Replacing Cushions
57
Replacing Throttle Trigger
59
Guide Bar Mounting System
61
Replacing Chain Tensioner
62
Replacing Guide Bar Stud
62
Installing Guide Bar Stud
63
Maintenance Guide
64
Service Intervals
64
Troubleshooting Guide
65
Disassembly Chart
67
Index
68
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Echo CS-420ES Specifications
General
Saw Chain Gauge
0.050 inches
Fuel Capacity
0.41 liters
Weight
4.6 kg
Saw Chain Pitch
3/8 inches
Bar Length
16 inches
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