1
SRM-420ES, SRM-420TES
T410S, B410S
T410TS, B410TS 1
TABLE OF CONTENTS
Page Page
1 SERVICE INFORMATION.....................................2
1-1 Specifications...................................................2
1-2 Technical data ..................................................4
1-3 Torque limits.....................................................5
1-4 Special repairing materials...............................5
1-5 Service Limits...................................................6
1-6 Special tools.....................................................7
2 STARTER SYSTEM..............................................8
2-1 Disassembling starter assembly.......................9
2-2 Replacing starter rope....................................10
2-3 Installing rewind spring...................................11
2-4 Assembling starter..........................................11
2-5 Replacing starter pawl....................................13
3 IGNITION SYSTEM.............................................14
3-1 Troubleshooting guide....................................14
3-2 Testing spark..................................................15
3-3 Inspecting spark plug .....................................15
3-4 Inspecting ignition switch................................16
3-5 Replacing ignition switch................................17
3-6 Inspecting ignition coil resistance...................21
3-7 Replacing spark plug cap and coil..................21
3-8 Replacing ignition coil.....................................22
3-9 Setting pole shoe air gaps..............................22
3-10 Inspecting flywheel and key ...........................23
4 FUEL SYSTEM ...................................................24
4-1 Inspecting air filter..........................................25
4-2 Inspecting fuel cap and fuel strainer...............25
4-3 Inspecting fuel tank and tank vent..................26
4-4 Replacing fuel line, fuel return line, tank vent
line and grommet............................................28
4-5 Adjusting carburetor.......................................30
4-5-1 General adjusting rules ..................................30
4-5-2 Throttle adjust screw, L mixture needle and
H mixture needle initial settings......................30
4-5-3 Adjusting carburetor.......................................31
4-6 Testing carburetor...........................................32
4-7 Inspecting crankcase pulse passage .............33
4-8 Inspecting metering lever height ....................33
4-9 Inspecting inlet needle valve..........................34
4-10 Inspecting diaphragm and others...................34
4-11 Replacing welch plug .....................................35
4-12 Replacing purge bulb .....................................35
4-13 Replacing throttle cable and control parts......36
4-14 Checking and adjusting throttle cable ............36
5 CLUTCH SYSTEM..............................................37
5-1 Removing clutch shoes and springs...............38
5-2 Installing clutch shoes....................................38
5-3 Removing clutch drum....................................39
5-4 Removing clutch drum bearings.....................39
5-5 Installing bearings and clutch drum................40
6 ENGINE...............................................................41
6-1 Testing cylinder compression.........................42
6-2 Cleaning cooling air passages .......................42
6-3 Inspecting muffler and exhaust port...............43
6-4 Testing crankcase and cylinder sealing..........44
6-5 Removing and inspecting cylinder..................44
6-6 Inspecting piston and piston ring....................45
6-7 Inspecting crankcase and crankshaft.............46
6-8 Replacing oil seal...........................................46
6-9 Replacing ball bearing....................................47
6-10 Assembling crankshaft and crankcase...........48
6-11 Installing piston...............................................48
6-12 Installing piston ring and cylinder...................49
7 CUTTER DRIVE SYSTEM..................................50
7-1 Replacing drive shaft......................................50
7-2 Disassembling gear case...............................51
7-3 Replacing gears and PTO shaft.....................52
7-4 Assembling gear case....................................54
8 MAINTENANCE GUIDE......................................55
8-1 Disassembly Chart.........................................55
8-2 Troubleshooting guide....................................56
8-3 Service Intervals.............................................58
