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ECHO: SRM-420ES SRM-420TES
shindaiwa:
T410S B410S
T410TS B410TS
(Serial number: 37000001 and after)
Ref. No. 402-44
Copyright(C)2018 YAMABIKO Corporation All rights reserved.

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  • Page 1 ECHO: SRM-420ES SRM-420TES shindaiwa: T410S B410S T410TS B410TS (Serial number: 37000001 and after) Ref. No. 402-44 Copyright(C)2018 YAMABIKO Corporation All rights reserved.
  • Page 2 INTRODUCTION This service manual contains information for service and maintenance of ECHO TRIMMER / BRUSHCUTTER, models SRM-420ES and SRM-420TES, shindaiwa TRIMMER / BRUSH- CUTTER, models T410S, B410S, T410TS and B410TS. For systematic diagnosis, to avoid extra work and time loss, please refer to “Troubleshooting guide”...
  • Page 3: Table Of Contents

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS TABLE OF CONTENTS Page Page 1 SERVICE INFORMATION ........2 Inspecting metering lever height ....33 Inspecting inlet needle valve ......34 Specifi cations ...........2 Technical data ..........4 4-10 Inspecting diaphragm and others ....34 Torque limits .............5 4-11 Replacing welch plug ........35 Special repairing materials .......5 4-12 Replacing purge bulb ........35...
  • Page 4: Service Information

    (in) 287 (11.3) 585 (23.0) Dry weight* kg (lb) 7.8 (17.2) 8.5 (18.7) Engine Type YAMABIKO, air-cooled, two-stroke, single cylinder Rotation Counterclockwise as viewed from the output end Displacement 41.5 (2.532) Bore mm (in) 40.0 (1.575) Stroke mm (in) 33.0 (1.299)
  • Page 5 (in) 312 (12.3) 620 (24.4) Dry weight* kg (lb) 8.0 (17.6) 8.7 (19.2) Engine Type YAMABIKO, air-cooled, two-stroke, single cylinder Rotation Counterclockwise as viewed from the output end Displacement 41.5 (2.532) Bore mm (in) 40.0 (1.575) Stroke mm (in) 33.0 (1.299)
  • Page 6: Technical Data

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS SERVICE INFORMATION 1-2 Technical data SRM-420ES SRM-420TES Model T410S, B410S T410TS, B410TS Engine Compression pressure MPa (kgf/cm ) (psi) 0.92 (9.4) (132) Clutch engagement speed r/min 3,700 Ignition system Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028) Spark test Tester gap w/ spark plug mm(in) 4.0 (0.16)
  • Page 7: Torque Limits

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS SERVICE INFORMATION 1-3 Torque limits Descriptions Size kgf•cm N•m in•lbf Starter system Pawl Starter case Ignition system Magneto rotor (Flywheel) Ignition coil Spark plug Fan cover Fuel system Carburetor Intake bellows Intake insulator Insulator plate Fuel tank bracket Fuel tank Clutch...
  • Page 8: Service Limits

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS SERVICE INFORMATION 1-5 Service limits 5K222 5K223 5K224 5K245 5K225 5K016 5K042 5K246 5K219 5K220 5K189 Description mm (in) A Cylinder bore When plating is worn and aluminum can be seen Piston outer diameter Min.
  • Page 9: Special Tools

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS SERVICE INFORMATION 1-6 Special tools Part Number Description Reference X602-000340 Torx wrench (T27) Removing and installing torx bolt PET304 Tachometer PET-304 Measuring engine speed to adjust carburetor 897800-79931 Spark tester Checking ignition system 91004 Module air gap gauge Adjusting pole shoe air gaps V265-000200 Flange nut...
  • Page 10: Starter System

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS STARTER SYSTEM 2 STARTER SYSTEM (ES-Start / Soft start) (A ) Starter case (B) Rewind spring (C) Rope reel (D) Power spring (E) Pawl catcher (F) Tapping screw (d2) (G) Starter rope (H) Starter grip (d1) Construction Working principle...
  • Page 11: Disassembling Starter Assembly

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS STARTER SYSTEM 2-1 Disassembling starter assembly 1. Remove stand (A). 2. Remove muffl er cover (B) and cylinder cover (C). 3. Remove four bolts (D) and starter assembly (E) from the unit. 4. Pull out starter rope about 30 cm (12 in) and hold rope reel (F) by hand.
  • Page 12: Replacing Starter Rope

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS STARTER SYSTEM 2-2 Replacing starter rope 1. Pull out and untie knot (A). 2. Pull knot (B) to remove rope from rope reel (C). 3. When installing new starter rope, singe both ends of rope to prevent fraying. 4.
  • Page 13: Installing Rewind Spring

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS STARTER SYSTEM 2-3 Installing rewind spring WARNING DANGER Use of eye protection and safety gloves are strongly recommended while working on re- wind spring. If rewind spring (A) is unwound from rope reel (B), follow steps below.
  • Page 14 SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS STARTER SYSTEM 2-4 Assembling starter (continued) 4. Install power spring (D), engaging hook (d1) with rope reel groove (a1). 5. Install pawl catcher (E), engaging hole (e) with power spring top end hook (d2). 6.
  • Page 15: Replacing Starter Pawl

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS STARTER SYSTEM 2-5 Replacing starter pawl 1. Remove starter assembly from unit. 2. Loosen bolt (A) and remove washer (B), pawl (C), and torsion spring (D). Replace damaged or worn parts. NOTE: When it is hard to loosen bolt, install piston stopper X644-000020 (E) in spark plug hole to stop crankshaft rotation and remove bolt easily.
  • Page 16: Ignition System

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS IGNITION SYSTEM 3 IGNITION SYSTEM (A) Flywheel (B) Ignition coil (C) Spark plug (D) Spark plug cap coil (E) Spark plug cap (F) Spark plug cap cover (G) High tension lead (H) Primary leads (J) Ground leads (K) Ignition switch (L) Woodruff key...
  • Page 17: Testing Spark

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS IGNITION SYSTEM 3-2 Testing spark 1. Remove spark plug cap from spark plug. 2. Connect spark plug cap to spark tester 897800- 79931 (A), and connect spark tester lead (B) on spark plug as shown. 3.
  • Page 18: Inspecting Ignition Switch

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS IGNITION SYSTEM 3-4 Inspecting ignition switch 1. Disconnect primary lead coupler (A). 2. Disconnect ground lead coupler (B). 3. Connect one probe of Ohm-meter or multi-me- ter to primary lead (C) of ignition switch side as shown.
  • Page 19: Replacing Ignition Switch

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS IGNITION SYSTEM 3-5 Replacing ignition switch Loop Handle type: 1. Disconnect primary lead coupler and ground lead coupler (Refer to “3-4 Inspecting ignition switch”). Disconnect throttle cable from carburetor. Remove front handle . 2. Remove screws (A) and loosen screw (B). Re- move main pipe from engine.
  • Page 20 SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS IGNITION SYSTEM 3-5 Replacing ignition switch (continued) 11. Set torsion spring (Q) to throttle trigger (J), hooking one end of torsion spring to rib (j) of throt- tle trigger as shown. tle t 12. Set torsion spring (P) to throttle latch (N) as shown.
  • Page 21 SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS IGNITION SYSTEM 3-5 Replacing ignition switch (continued) U-handle type: NOTE: U-shaped handle and related parts have been changed. For details, refer to Technical Infor- mation Y2015-574. 1. Push one side hole (A) and the other side with screwdriver.
  • Page 22 SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS IGNITION SYSTEM 3-5 Replacing ignition switch (continued) 13. Install throttle latch (D), hooking torsion spring end (f2) as shown. Install throttle trigger (C) with tor- sion spring (E) as shown. Connect end (g) of throttle cable (G) to trigger (C) as shown. Fig.1 14.
  • Page 23: Inspecting Ignition Coil Resistance

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS IGNITION SYSTEM 3-6 Inspecting ignition coil resistance 1. Remove starter assembly (Refer to “2-1 Disas- sembling starter assembly). Remove inner cylinder cover and fan cover. 2. Connect one probe of Ohm-meter or multimeter to spark plug cap coil (A). 3.
  • Page 24: Replacing Ignition Coil

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS IGNITION SYSTEM 3-8 Replacing ignition coil 1. Loosen two bolts (A) of ignition coil. 2. Remove ignition coil with primary lead (B) and grommet (C) from crankcase, taking care not to lose collars (D). 3.
  • Page 25: Inspecting Fl Ywheel And Key

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS IGNITION SYSTEM 3-10 Inspecting fl ywheel and key 1. Inspect magnetic force of flywheel using flux meter, or screwdriver (A) as shown. 2. If magnetic force is weak, replace flywheel as follows. 3. Disconnect spark plug cap and remove spark plug.
  • Page 26: Fuel System

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS FUEL SYSTEM 4 FUEL SYSTEM (A) Fuel tank (M) Air fi lter (B) Fuel cap (N) Prevent plate (C) Fuel strainer (O) Air cleaner case (D) Fuel line (P) Intake gasket (E) Fuel return line (Q) Carburetor (F) Tank vent (R) Insulator plate...
  • Page 27: Inspecting Air Fi Lter

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS FUEL SYSTEM 4-1 Inspecting air fi lter 1. Close choke shutter and remove air cleaner cover and air fi lter. 2. Clean air cleaner cover and air fi lter with com- pressed air or wash air fi lter in a suitable cleaning solvent.
  • Page 28: Inspecting Fuel Tank And Tank Vent

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS FUEL SYSTEM 4-3 Inspecting fuel tank and tank vent 1. Remove air cleaner cover. Disconnect black fuel line from carburetor and connect pressure tester 897803-30133 (A) to fuel line with joint pipe V186- 000510 (B). 2.
  • Page 29 SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS FUEL SYSTEM 4-3 Inspecting fuel tank and tank vent (continued) NOTE: Inspection with pressure tester 897803- 30133 If pressure tester 91139 or 91149 is not available, tank vent can be inspected with pressure tester 897803-30133 as follows.
  • Page 30: Replacing Fuel Line, Fuel Return Line, Tank Vent Line And Grommet

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS FUEL SYSTEM 4-4 Replacing fuel line, fuel return line, tank vent line and grommet 1. Disconnect fuel line (A) from carburetor, and fuel return line (B) from purge bulb. 2. Remove fuel line grommet (D) from fuel tank, together with fuel line (A), fuel return line (B) and tank vent line (C).
  • Page 31 SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS FUEL SYSTEM 4-4 Replacing fuel line, fuel return line, tank vent line and grommet (continued) 5. Connect fuel strainer (F) with clip (G) to fuel line (E). Connect fuel line (E) to fuel line (A) together with pipe connector (H) and clips (J: dia.
  • Page 32: Adjusting Carburetor

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS FUEL SYSTEM 4-5 Adjusting carburetor 4-5-1 General adjustment rules A. Before starting the unit for adjustment, check the following items. 1. The correct spark plug must be clean and properly gapped. 2. The air fi lter element must be clean and properly installed. 3.
  • Page 33: Adjusting Carburetor

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS FUEL SYSTEM 4-5-3 Adjusting carburetor SRM-420ES(L), T410S : Remove shield and cut trimmer head line lengths to 190 mm. SRM-420ES(U), B410S : Remove shield and blade, and install nylon line head, cut the line lengths to 190 mm.
  • Page 34: Testing Carburetor

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS FUEL SYSTEM 4-6 Testing carburetor NOTE: To perform this test, carburetor interior should be wet with fuel. If dry, a little leakage may occur. 1. Remove air cleaner cover. Disconnect fuel line (A) from carburetor. 2.
  • Page 35: Inspecting Crankcase Pulse Passage

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS FUEL SYSTEM 4-7 Inspecting crankcase pulse passage 1. Remove pulse pipe (A) from carburetor and drop a little oil on the end of pulse pipe (A). 2. Remove spark plug and pull starter grip several times.
  • Page 36: Inspecting Inlet Needle Valve

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS FUEL SYSTEM 4-9 Inspecting inlet needle valve 1. Remove metering lever (A) and pivot pin. Re- move spring (B) and inlet needle valve (C). 2. Inspect inlet needle valve if worn or sticky. Clean or replace as required.
  • Page 37: Replacing Welch Plug

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS FUEL SYSTEM 4-11 Replacing welch plug If engine does not run smoothly even after read- justing carburetor and inspecting carburetor parts, inspect low speed ports on carburetor as follows: 1. Remove metering lever and related parts to pro- tect them from damage.
  • Page 38: Replacing Throttle Cable And Control Parts

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS FUEL SYSTEM 4-13 Replacing throttle cable and control parts When throttle cable inner wire does not move smoothly, disconnect throttle cable from carburetor and apply lubricating oil inside the cable. If it is still hard to move, replace throttle cable.
  • Page 39: Clutch System

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS CLUTCH SYSTEM 5 CLUTCH SYSTEM ( A ) Retaining ring ( B ) Clutch case ( C ) Ball bearing ( D ) Retaining ring ( E ) Clutch drum ( F ) Flat spring ( G ) Spring ( H ) Clutch shoe ( J ) Spacer...
  • Page 40: Removing Clutch Shoes And Springs

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS CLUTCH SYSTEM 5-1 Removing clutch shoes and spring 1. Remove four bolts and remove clutch case (A). 2. Check clutch shoes (B) for wear or damage. Replace clutch shoes as follows if they have a de- fect.
  • Page 41: Removing Clutch Drum

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS CLUTCH SYSTEM 5-3 Removing clutch drum 1. Remove retaining ring (A) from clutch drum shaft (b) using needle nose pliers. 2. Push out clutch drum (B) using press machine with 12 mm (0.47 in.) diameter pusher (C). 5-4 Removing clutch drum bearings 1.
  • Page 42: Installing Bearings And Clutch Drum

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS CLUTCH SYSTEM 5-5 Installing bearings and clutch drum 1. Lightly lubricate the bearing bore of clutch case with a oil or grease. 2. Meet each open side of new ball bearings (A) and push them together in clutch case until those bottom.
  • Page 43: Engine

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS ENGINE 6 ENGINE ( A ) Cylinder ( B ) Cylinder gasket ( C ) Piston ring ( D ) Piston ( E ) Piston pin ( F ) Snap ring ( G ) Piston pin spacer ( H ) Needle bearing ( J ) Crankshaft assembly ( K ) Crankcase gasket...
  • Page 44: Testing Cylinder Compression

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS ENGINE 6-1 Testing cylinder compression NOTE: Test cylinder compression when engine is cold. 1. Move ignition switch to STOP position. Then re- move spark plug. 2. Install compression gauge 91037 (A) in spark plug hole and tighten by hand. Pull starter several times to stabilize reading on compression gauge.
  • Page 45: Inspecting Muffl Er And Exhaust Port

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS ENGINE 6-3 Inspecting muffl er and exhaust port 1. Remove three bolts and remove muffler (A), muffl er gasket (B) and (C) from cylinder. NOTE: Replacing muffl er gasket (B) and (C) with new one when removing them. 2.
  • Page 46: Testing Crankcase And Cylinder Sealing

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS ENGINE 6-4 Testing crankcase and cylinder sealing 1. Remove muffler cover, air cleaner cover, cyl- inder cover, starter assembly and innner covers. Remove carburetor, insulator plates and cable holder (Refer to “4-12 Replacing purge bulb”). 2.
  • Page 47: Inspecting Piston And Piston Ring

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS ENGINE 6-6 Inspecting piston and piston ring 1. Inspect piston rings (A) and replace them if bro- ken, scored, or exceeded service limits (Refer to “1-5 Service limits”). 2. Inspect piston crown (B). Clean it with fi ne sand paper, oil stone, and soft cleaning brush (C) if car- bon is found.
  • Page 48: Inspecting Crankcase And Crankshaft

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS ENGINE 6-7 Inspecting crankcase and crankshaft 1. Remove four bolts securing crankcase. Flywheel side of crankcase NOTE: Before removing fl ywheel side crankshaft, remove woodruff key. Replace it with new one, when removing it (Refer to “3-10 Inspecting fly- wheel and key”).
  • Page 49: Replacing Ball Bearing

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS ENGINE 6-8 Replacing oil seal (continued) Oil seal section 4. Apply lithum based grease on dust lip and seal lip of oil seal to avoid damage of lips while insert- Dust lip ing crankshaft into oil seal. 5.
  • Page 50: Assembling Crankshaft And Crankcase

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS ENGINE 6-10 Assembling crankshaft and crankcase 1. Clean the mating surface of each crankcase half. 2. Insert crankshaft clutch end into clutch side of crankcase half until seated to the bottom. NOTE: If it is hard to insert crankshaft to crank- case, preheat ball bearing for easier installation.
  • Page 51: Installing Piston Ring And Cylinder

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS ENGINE 6-12 Installing piston ring and cylinder 1. Install piston ring on piston, ensuring the end gaps of piston ring are properly positioned around locating pin (A) as shown. 2. Set new cylinder gasket on cylinder base with a little glue for easier installation of cylinder.
  • Page 52: Cutter Drive System

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS CUTTER DRIVE SYSTEM 7 CUTTER DRIVE SYSTEM (A) PTO (Driven) Shaft (B) Ball bearing (C) Ball bearing (Only for SRM-420TES, T410TS and B410TS) (D) Retaining ring (E) Retaining ring (Only for SRM-420TES, T410TS and B410TS) (F) Washer (G) Adapter plate (H) Drive gear...
  • Page 53: Disassembling Gear Case

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS CUTTER DRIVE SYSTEM 7-2 Disassembling gear case 1. Check gear case for cracks and PTO shaft for smooth rotation. Disassemble gear case as follows if defective. 2. Remove nylon line head from PTO shaft, and gear case (A) from drive shaft housing.
  • Page 54: Replacing Gears And Pto Shaft

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS CUTTER DRIVE SYSTEM 7-3 Replacing gears and PTO shaft NOTE : Replace drive gear (A), driven gear (B) and ball bearings (C) as a set. SRM-420TES T410TS B410TS 1. Remove retaining ring (D) using needle nose SRM-420TES pliers.
  • Page 55 SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS CUTTER DRIVE SYSTEM 7-3 Replacing gears and PTO shaft (continued) For SRM-420ES, T410S and B410S 5. Install a new ball bearing (M) to PTO shaft us- ing oil seal tool 897714-24330 (F). 6. Install a new driven gear (N) to PTO shaft. 7.
  • Page 56: Assembling Gear Case

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS CUTTER DRIVE SYSTEM 7-4 Assembling gear case 1. Heat up the top of gear case with a heat gun as shown, then insert the assembled PTO shaft (A) into gear case until it bottoms. WARNING DANGER When using a heat gun, put on gloves.
  • Page 57: Maintenance Guide

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS MAINTENANCE GUIDE 8 MAINTENANCE GUIDE 8-1 Disassembly chart Air cleaner Muffler cover cover Cylinder Stand cover Starter Air filter assembly (4-1) (2-1) Inner Clutch cylinder case cover (5-1) Carburetor (4-6) Clutch Clutch Muffler Fuel assembly drum cover...
  • Page 58: Troubleshooting Guide

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS MAINTENANCE GUIDE 8-2 Troubleshooting guide TROUBLE Engine does not crank. Engine does not start. Fuel leaks. Idling is not stable. Acceleration is poor. Engine stalls at high speed. Engine lacks power. Engine overheats. Engine misfires. Engine / others are extremely noisy.
  • Page 59 SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS MAINTENANCE GUIDE 8-2 Troubleshooting guide (continued) CHECKING REFERENCES Check first. Fuel system / Carburetor 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 Air filter Fuel cap / strainer Carburetor adjustment Carburetor leakage Fuel tank / vent / line...
  • Page 60: Service Intervals

    SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS MAINTENANCE GUIDE 8-3 Service intervals Intervals Inspecting point Service Reference 3 months 6 months Daily 100 hours 300 hours Screws and bolts * Retighten / Replace Air fi lter Clean Inspect / Replace Carburetor Inspect / Repair 4-5 to 4-11 Fuel leaks...
  • Page 61 SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS MEMORANDUM...
  • Page 62 SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS MEMORANDUM...
  • Page 63 SRM-420ES, SRM-420TES T410S, B410S T410TS, B410TS MEMORANDUM...
  • Page 64 Published by YAMABIKO Corp. Tokyo Japan 1805...

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