Echo SRM-420ES (L): SRM-420ES (U) Montageanleitung

SRM-420ES

10-42A-00 1

INTRODUCTION

We 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.

SERVICE DATA

TRIMMER/BRUSHCUTTER

ECHO:

SRM-420ES

STAGE MODEL

(Serial number : 37000001 and after)

CONTENTS

page

1 SERVICE INFORMATION.............................. 2

1-1 Speciﬁcation ............................................... 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 CARBURETTOR ADJUSTMENT PROCEDURE

.. 7

2-1 General adjusting rules............................... 7

2-2 Presetting Idle adjust screw, L mixture

needle

and H mixture needle

.......................................... 7

2-3 Adjusting carburettor................................... 8

Reference No. 10-42A-00

ISSUED: 201204

SERVICE INFORMATION SRM-420ES

1 SERVICE INFORMATION

1-1 Speciﬁcations

Model SRM-420ES (L) SRM-420ES (U)

Dimentions* Length mm (in) 1840 (72.4)

Width mm (in) 355 (14.0) 680 (26.8)

Heigh mm (in) 287 (11.3) 510 (20.1)

Dry weight* kg (lb) 8.3 (18.2) 8.8 (19.3)

Engine Type YAMABIKO, air-cooled, two-stroke, single cylinder

Rotation Anticlockwise as viewed from the output end

Displacement cm3 (in3) 41.5 (2.53)

Bore mm (in) 40.0 (1.58)

Stroke mm (in) 33.0 (1.30)

Compression ratio 6.7

Carburettor Type Rotary type : Diaphragm, horizontal-draught, with primer

Model WALBRO WT-1046

Ignition Type CDI (Capacitor discharge ignition) system

Digital magneto

Spark plug BPMR8Y

Exhaust Mufﬂer type Spark arrester mufﬂer with catalyst

Starter Type ES (effortless-start)

Rope diameter x length mm (in) 3.8 x 910 (0.15 x 35.9)

Fuel** Type Premixed two-stroke fuel

Mixture ratio 50 : 1 (2%)

Petrol Minimum 89 octane

Two-stroke engine oil ISO-L-EGD (ISO/CD13738), JASO FC/FD

Tank capacity L (U.S.ﬂ.oz.) 0.68 (23.0)

Clutch Type Centrifugal, 2-shoe pivot

Handle Type

Front : Crescent loop with cushion grip

U-handle with integrated

control grip

Rear : Integrated control grip with cushion

Drive shaft Type Solid type with serration (10-tooth)

Diameter - Length mm (in) 8.0 - 1588 (0.31 - 62.52)

Housing OD - ID mm (in) 28.0 - 24.0 (1.10 - 0.94)

Main pipe Length mm (in) 1537 (60.5)

Gear case Reduction ratio 1.33

Gear tooth Spiral bevel gear

Lubrication Lithium based grease or ECHO XTended Protection TM Lubricant

Cutter Type Nylon line cutter 3-tooth blade (255 mm)

Arbor diameter for blade mm (in) 25.4 (1.0)

Fastener type, size mm Left-hand thread nut, M10 x 1.25 pitch

Cutting rotation Anticlockwise as viewed from top

OD: Outer diameter. ID: Inner diameter. * Without shoulder harness and standard cutter.

** Refer to Operator’s manual.

SERVICE INFORMATIONSRM-420ES 3

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/cm2) (psi) 0.92 (9.4) (132)

Ignition system with stop holding function

Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)

Minimum secondary voltage at 1500 r/min kV 22

Primary coil resistance MΩ2.4 -2.9

(Red Probe on stop terminal of module)

Secondary coil resistance Ω930 - 970

Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)

Ignition timing at 3,000 r/min °BTDC 12

at 8,000 r/min °BTDC 25

at 10,000 r/min °BTDC 23

Carburettor

Venturi Size 12.7 (0.50)

Throttle Bore 14.3 (0.56)

Idle adjust screw initial setting turns in*** 2 1/8

L mixture needle initial setting turns out 2 3/8

H mixture needle initial setting turns out 3

Test Pressure, minimum MPa (kgf/cm2) (psi) 0.05 (0.5) (7.0)

Metering lever height mm(in) 1.65 (0.06) lower than diaphragm seat

BTDC: Before top dead centre.

*With Nylon line cutter and shield.

**With 3-tooth blade (255 mm).

*** Set idle adjust screw to the point that its tip just contacts throttle plate before initial setting.

†If clutch engagement speed is lower than lower service limit speed or higher than uper service limit speed,

replace clutch assembly with new one.

SERVICE INFORMATION SRM-420ES

1-3 Torque limits

Descriptions Size kgf•cm N•m in•lbf

Starter Pawl M 8 60 - 90 6 - 9 50 - 80

system Starter case M 5 30 - 45 3 - 4.5 26 - 40

Ignition Magneto rotor (Flywheel) M 8 200 - 240 20 - 24 175 - 210

system Ignition coil M 5 50 - 70 5 - 7 45 - 60

Spark plug M 14 130 - 170 13 - 17 115 - 150

Fan cover M 5 30 - 45 3 - 4.5 26 - 40

Fuel Carburettor M 5 40 - 55 4 - 5.5 35 - 50

system Intake bellows M 5 30 - 50 3 - 5 26 - 45

Intake insulator M 5 50 - 70 5 - 7 45 - 60

Insulator plate M 5 30 - 45 3 - 4.5 26 - 40

Fuel tank bracket M 5 50 - 70 5 - 7 45 - 60

Fuel tank M 5 50 - 70 5 - 7 45 - 60

Clutch Clutch shoe M 6 70 - 110 7 - 11 60 - 95

Engine Crankcase M 5** 70 - 110 7 - 11 60 - 95

Cylinder M 5** 70 - 110 7 - 11 60 - 95

Cylinder cover M 5 20 - 30 2 - 3 17 - 26

Stand M 5 20 - 30 2 - 3 17 - 26

Mufﬂer M 6 100 - 140 10 - 14 90 - 125

Mufﬂer cover M 5* 30 - 45 3 - 4.5 26 - 40

Mufﬂer stay M 5 60 - 90 6 - 9 50 - 80

Others Blade fastening nut LM 10 280 - 320 28 - 32 245 - 280

Regular bolt, nut and screw M 3 6 - 10 0.6 - 1 5 - 9

M 4 15 - 25 1.5 - 2.5 13 - 22

M 5 25 - 45 2.5 - 4.5 22 - 40

M 6 45 - 75 4.5 - 7.5 40 - 65

M 8 110 - 150 11 - 15 95 - 130

M 10 210 - 300 21 - 30 180 - 260

LM: Left hand thread.* Apply thread locking sealant. (See below)

** The torque differences among four bolts should not exceed 20 kgf•cm (2N•m, 17in•lbf) on one cylinder or

crankcase.

1-4 Special repairing materials

Material Location Remarks

Grease Gear case

Rewind spring

Lithium based grease or ECHO XTended Protection

Starter center post Lubricant

Oil Oil seal inner lips Two-stroke engine oil or engine oil (SAE#30)

Drive shaft

Thread locking sealant Mufﬂer cover Loctite #242, ThreeBond #1324 or equivalent

SERVICE INFORMATIONSRM-420ES 5

5K225 5K016 5K042

5K1895K219 5K220

5K246

5K245 5K223 5K2245K222

1-5 Service limits

ABCD

EFGH

KLM

Description mm (in)

A Cylinder bore When plating is worn and aluminum can be seen

BPiston outer diameter Min. 39. 91 (1.571)

CPiston pin bore Max. 10. 035 (0.3951)

DPiston ring groove Max. 1. 6 (0.063)

EPiston ring side clearance Max. 0. 1 (0.004)

FPiston pin outer diameter Min. 9. 98 (0.3929)

GPiston ring width Min. 1. 45 (0.057)

HPiston ring end gap Max. 0. 5 (0.02)

KCon-rod small end bore Max. 13. 025 (0.5128)

LCrankshaft runout Max. 0. 02 (0.001)

MClutch drum bore Max. 71. 5 (2.81)

SERVICE INFORMATION SRM-420ES

1.5

1.65

1.3

0.4

0.8

1.2

MPa

PET-304

Key Part Number Description Used for:

1 G310-000050 Tachometer PET-304 Measuring engine speed to adjust carburettor

2 X605-000050 Torx L wrench Removing and installing bolt

3 897501-03938 Puller Removing ﬂywheel

4 897835-16131 Pressure connector Testing crankcase and cylinder leakages

5 897537-30130 Piston stopper Locking crankshaft rotation

6 897563-19830 Metering lever gauge Measuring metering lever height on carburettor

7 897603-23030 PTO shaft puller Removing PTO shaft

8 897701-02830 Bearing wedge Removing ball bearing remaining on crankshaft

9 897701-06030 Bearing wedge Removing ball bearing on PTO shaft / drive gear

10 897701-14732 Bearing tool Removing and installing ball bearings on crankcase / clutch drum

11 897702-30131 Piston pin tool Removing and installing piston pin (Use 10mm dia. adapter)

12 897712-04630 2-pin wrench Removing and installing pawl carrier

13 897714-12330 Oil seal tool Installing crankcase oil seal (clutch side)

14 897714-24330 Oil seal tool Installing crankcase oil seal (starter side) / PTO shaft bearings

15 897726-21430 Oil seal tool Installing crankcase oil seal (clutch side)

16 897718-03930 Bearing tool Installing crankcase oil seal (starter side)

17 897719-02830 Piston holder Making piston steady to remove and install piston / ring

18 363018-00310 Washer Installing crankcase oil seal (starter side)

19 897800-79931 Spark tester Checking ignition system

20 897803-30132 Pressure tester Testing fuel pipes/tank and crankcase leakages

21 897826-16131 Pressure plug Plugging intake port to test crankcase / cylinder sealing

22 897827-16131 Pressure plate Plugging intake port to test crankcase / cylinder sealing

23 897831-16131 Pressure plug Plugging exhaust port to test crankcase / cylinder sealing

24 91037 Compression gauge Measuring cylinder compression

25 Y089-000091 D-shaped tool Adjusting mixture needle

1-6 Special tools

78: a = 80 mm

9: a = 70 mm

2: b =6mm

14: a = 12 mm

= 32 mm

15: a = 15 mm

= 24.5mm

SERVICE INFORMATIONSRM-420ES 7

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 ﬁlter element must be clean and properly installed.

3. The mufﬂer exhaust port must be clear of carbon.

4. The fuel lines, tank vent and fuel ﬁlter are in good condition and clear of debris.

The fuel is fresh ( > 89 octane : RON ) and properly mixed at 50 : 1 with “ISO L-EGD” or “JASO FC/FD” 2-stroke oil.

6. Install nylon line cutter with 2 nylon lines with 150 mm, even if 3-tooth blade is installed, for proper en-

gine loading to make sure engine speed on both SRM-420ES(L) and SRM-420ES(U).

B. Preliminary adjustment. Adjustment by Idle adjust screw of carburetor.

Start and run engine for 3 minute

alternating engine speed between WOT for 50 seconds and idle for 10 sec-

onds.

Adjust idle engine speed to 2,800 +/- 100 r/min by turning Idle adjust screw. Conﬁrm WOT engine speed

approx. 10,000 r/min. If engine does not run correctly after this adjustment, proceed to the next step 2-2.

2-2 Presetting Idle adjust screw, L mixture needle and H mixture needle

Tools Required : Small screwdriver with 2.5 mm

blade, P/N G310-000050 electronic tachometer,

P/N Y089-000091 D-shaped tool (A).

1. Turn L and H mixture needle clockwise until

lightly seated, and then turn out both mixture nee-

dles following turns.

L mixture needle (B) : 2 3/8

H mixture needle (C) : 3

NOTE : If needles are overtighented during seat-

ing, damage to carburettor may occur.

2. Remove air cleaner lid to expose the Idle adjust

screw and throttle plate. Turn Idle adjust screw (D)

anticlockwise until Idle adjust screw tip just touch-

es throttle plate. Then turn it clockwise 2 1/8 turns.

Reinstall air cleaner lid.

NOTE : The initial carburettor settings for Idle ad-

just screw, Idle and H mixture needles are intended

to start and run the engine before ﬁnal carburettor

adjustments are made through this procedure. The

actual number of turns needed for engine opera-

tion may vary.

(A)

(D)

(C)

(B)

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.

2. Adjust L mixture needle (B) to reach maximum

idle speed using 2.5 mm blade screwdriver.

3. Set Idle speed to 3,550 r/min by turning Idle

adjust screw (D). Engine speed should be stable at

3,550 +/- 50 r/min.

4. Turn L mixture needle (B) anticlockwise to re-

duce engine idle speed 800 r/min to set idle speed

at 2,750 r/min. The idle speed range is 2,650 - 2,850

r/min.

5. Turn Idle adjust screw (D) clockwise to increase

idle engine speed to set idle at 2,800 r/min. The

idle speed range is 2,700 to 2,900 r/min.

NOTE : Engine speed must be allowed to stabilize

a minimum of 20 seconds after each adjustment of

idle mixture needle to assure accurate tachometer

readings.

6. Adjust H mixture needle (C) to reach maximum

WOT engine speed. Then turn H mixture needle (C)

anticlockwise to reduce WOT engine speed 120

r/min (RANG : 100-140 r/min).

max. approx. 9,000 r/min

NOTE : Nylon line length should be 190 mm with-

out shield.

7. SRM-420ES(L) : Stop engine, and restart en-

gine and verify engine idle speed ranges from 2,400

to 3,200 r/min, and expand and cut nylon line by

shield knife and WOT engine speed ranges from

9,500 to 10,500 r/min.

NOTE : Nylon line length should be 150 mm with

shield

SRM-420ES(U) : Stop engine and reinstall shield

for 3-tooth blade (255 mm) and the blade. Restart

engine and verify engine idle speed ranges from

2,400 to 3,200 r/min, and WOT engine speed

ranges from 10,500 to 11,500 r/min.

Make sure the nylon line cutter does not rotate

when engine is at idle. Engine should start and ac-

celerate smoothly.

NOTE : WOT, and idle speed in field operation

may vary from ﬁnal adjustment speciﬁcations due

to changing ambient conditions, fuel, and engine

loads. Safe engine speed variances should be

within the WOT and Idle speed ranges listed in

Section 1-2, otherwise the carburettor should be

readjusted.

(C)

(B)

(D)

t = 190 mm

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