Echo SRM-420ES (L): SRM-420ES (U) Service Data
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Echo SRM-420ES (L): SRM-420ES (U) Service Data

Stage ii model, trimmer/brushcutter
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10-42A-00
SERVICE DATA
TRIMMER/BRUSHCUTTER
ECHO:
(Serial number : 37000001 and after)
INTRODUCTION
W e are constantly working on technical im-
provement of our products. For this reason,
technical data, equipment and design are
subject to change without notice. All speci-
fications and directions in this SERVICE
DATA are based on the latest product infor-
mation available at the time of publication.
SRM-420ES
SRM-420ES
STAGE
MODEL
1 SERVICE INFORMATION .............................. 2
1-1 Specifi cation ............................................... 2
1-2 Technical data ............................................. 3
1-3 Torque limits................................................ 4
1-4 Special repairing materials ......................... 4
1-5 Service limits............................................... 5
1-6 Special tools ............................................... 6
2-1 General adjusting rules ............................... 7
and H mixture needle .......................................... 7
2-3 Adjusting carburettor................................... 8
CONTENTS
Reference No.
10-42A-00
I S S U E D :
2 0 1 2 0 4
1
1
page

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Summary of Contents for Echo SRM-420ES (L): SRM-420ES (U)

  • Page 1 SRM-420ES 10-42A-00 SERVICE DATA TRIMMER/BRUSHCUTTER SRM-420ES ECHO: STAGE MODEL (Serial number : 37000001 and after) INTRODUCTION CONTENTS page W e are constantly working on technical im- 1 SERVICE INFORMATION ......2 provement of our products. For this reason, 1-1 Specifi cation ..........2 technical data, equipment and design are 1-2 Technical data ..........

  • Page 2: Service Information

    (in) 1537 (60.5) Gear case Reduction ratio 1.33 Gear tooth Spiral bevel gear Lubrication Lithium based grease or ECHO XTended Protection Lubricant Cutter Type Nylon line cutter 3-tooth blade (255 mm) Arbor diameter for blade mm (in) 25.4 (1.0) Fastener type, size Left-hand thread nut, M10 x 1.25 pitch...

  • Page 3: Technical Data

    SRM-420ES SERVICE INFORMATION 1-2 Technical data Model SRM-420ES (L) SRM-420ES (U) Engine Idling speed r/min 2,800 +/- 400 Wide open throttle speed r/min 9,500 - 10,500* 10,500 - 11,500** Clutch engagement speed r/min 3,700 † Engagement Limit r/min Less 3,300 or over 4,300 Compression pressure MPa (kgf/cm ) (psi)

  • Page 4: Torque Limits

    1-4 Special repairing materials Material Location Remarks Grease Gear case Lithium based grease or ECHO XTended Protection Rewind spring Lubricant Starter center post Oil seal inner lips Two-stroke engine oil or engine oil (SAE#30) Drive shaft Thread locking sealant Muffl...

  • Page 5: Service Limits

    SRM-420ES 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. 39. 91 (1.571) Piston pin bore Max.

  • Page 6: Special Tools

    SERVICE INFORMATION SRM-420ES 1-6 Special tools 2: b = 6 a = 80 a = 70 a = 12 b = 32 : a = 15 b = 24.5 Part Number Description Used for: G310-000050 Measuring engine speed to adjust carburettor Tachometer PET-304 X605-000050 Torx L wrench...

  • Page 7: Carburettor Adjustment Procedure

    SRM-420ES SERVICE INFORMATION 2 CARBURETTOR ADJUSTMENT PROCEDURE 2-1 General adjusting 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 8: Adjusting Carburettor

    SERVICE INFORMATION SRM-420ES 2-3 Adjusting carburettor SRM-420ES(L): Remove shield and cut trimmer head line lengths to 190 mm. SRM-420ES(U) : Remove shield and blade, and cut trimmer head line lengths to 190 mm. 1. Start and warm engine for 3 minute alternating engine speed between WOT for 50 seconds and idle for 10 seconds.

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