Page 1
10-52F-01
SRM-510ES
SERVICE DATA
TRIMMER/BRUSHCUTTER
SRM-510ES
1
1
(Serial number : 36000001 and after)
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 specifications, illustrations and directions in this
SERVICE DATA are based on the latest
product information available at the time of
publication.
ECHO SERVICE MANUAL Ord. 402-25
(Model : SRM-4000, RM-4000) contains lots
of information for servicing this model.
CONTENTS
1 SERVICE INFORMATION
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 CARBURETTOR ADJUSTMENT PROCEDURE
2-1 General adjusting rules ............................... 7
2-2 Presetting Idle adjust screw, Idle mixture
needle and Hi speed mixture needle
2-3 Adjusting carburettor................................... 8
.............................. 2
.................... 7
page
.. 7
Reference No.
REVISED: 201002
10-52F-01
ISSUED: 200906
Page 2
2
SERVICE INFORMATION SRM-510ES
1 SERVICE INFORMATION
1-1 Specifi cations
Model
SRM-510ES (L) SRM-510ES (U)
Dimensions* Length mm(in) 1860 (73.2)
Width mm(in) 355 (14.0) 655 (25.8)
Height mm(in) 324 (12.8) 460 (18.1)
Dry weight* kg(lb) 8.5 (18.7) 8.8 (19.3)
Engine Type KIORITZ, air-cooled, two-stroke, single cylinder
Rotation Anticlockwise as viewed from the output end
Displacement cm
3
(in3) 51.7 (3.155)
Bore mm(in) 44.0 (1.732)
Stroke mm(in) 34.0 (1.339)
Compression ratio 5.8
Carburettor Type Rotary type : Diaphragm, horizontal-draught, with primer
Model Walbro WYK-341
Venturi size -Throttle bore mm(in) 13.5 - 15.0 (0.531 - 0.591)
Metering diaphragm pressure Lead pressure from inside of cleaner case
Ignition Type CDI (Capacitor discharge ignition) system
Digital magneto
Spark plug RCJ-6Y, BPRM7A
Starter Type ES (effortless-start)
Rope diameter x length mm(in) 3.8 x 1150 (0.15 x 45.3)
Fuel Type Premixed two-stroke fuel
Mixture ratio
50 : 1 (2 %)
Petrol Minimum 89 octane petrol (RON)
Two-stroke air cooled engine oil ISO-L-EGD (ISO/CD13738), JASO FC/FD
Tank capacity L (U.S.fl .oz.) 1.0 (33.8)
Clutch Type Centrifugal, 2 - shoe pivot
Handle Type
Front : Crescent loop with cushion grip
Rear : Integrated control grip with cushion
U-handle
with integratedcontrol grip
Drive shaft Type Solid, hollow type with serration (10-tooth)
Inner shaft: Diameter - Length mm(in)
8 - 1588 (0.31 - 62.5)
Housing OD -ID mm(in) 28 - 24 (1.10 -0.94)
(Main pipe) Length mm(in) 1530 (60.2)
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 (255mm)
Pilot diameter 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.
†
Primer is on cleaner case.
Page 3
SERVICE INFORMATIONSRM-510ES
1-2 Technical data
Model
SRM-510ES (L) SRM-510ES (U)
Engine
Idling speed r/min 2,750 +/- 250
Operating speed r/min 8,000
Wide open throttle speed r/min 9,500 - 11,000*
Clutch engagement speed r/min 3,500
Service limit speed† r/min 3,300
Compression pressure MPa (kgf/cm2) (psi) 0.83 (8.5) (121)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1000 r/min kV 14.0
Secondary coil resistance kΩ 2.0 - 2.8
Pole shoe air gaps mm(in) 0.30 - 0.40 (0.012 - 0.016)
Ignition timing at 1,000 r/min °BTDC 22
at 3,000 r/min °BTDC 15
at 8,000 r/min °BTDC 25
at 10,000 r/min °BTDC 25
PET-9000 Parameter #1 328
#2 05
Carburettor
Idle adjust screw initial setting turns in** 1 1/2
Idle mixture needle initial setting turns in*** 13
Hi speed mixture needle initial setting turns out
Test Pressure, minimum MPa (kgf/cm2) (psi) 0.05 (0.5) (7.0)
Metering lever height mm(in) 1.5 (0.06) lower than diaphragm seat
Air cleaner system
type Inner vent
Air fi lter Pleats
3 3/4
1
11,000 - 11,700*
3
2
BTDC: Before top dead centre.
*1 With Nylon line cutter and shield.*2 With 3-tooth blade (255 mm).
** Set idle adjust screw to the point that its tip just contacts throttle plate before initial setting.
*** Screw in idle mixture needle from initial thread engagement (at the point that the clicking sound is heard).
†
If clutch engagement speed is lower than service limit speed, replace clutch assembly with new one.
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4
1-3 Torque limits
Descriptions Size kgf•cm N•m in•lbf
Starter Starter pulley M 8 180 - 220 18 - 22 160 - 190
system
Ignition Magneto rotor (Flywheel) M 10 200 - 240 20 - 24 175 - 210
system
Spark plug M 14 130 - 170 13 - 17 115 - 150
Fan cover M 5 50 - 90 5 - 9 45 - 80
Fuel Carburettor insulator M 5 40 - 55 4 - 5.5 35 - 50
system
Fuel tank bracket M 5 70 - 110 7 - 11 60 - 95
Fuel tank M 5* 50 - 90 5 - 9 45 - 80
Clutch Clutch shoe M 8 160 - 200 16 - 20 140 - 175
Engine Crankcase M 5** 70 - 110 7 - 11 60 - 95
Cylinder M 5** 70 - 110 7 - 11 60 - 95
Top guard M 5* 30 - 45 3 - 4.5 26 - 40
Muffl er M 6 110 - 150 11 - 15 95 - 130
Muffl er cover M 5* 30 - 45 3 - 4.5 26 - 40
Muffl er stay M 5 70 - 110 7 - 11 60 - 95
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
Starter case M 5* 35 - 50 3.5 - 5 30 - 45
Ignition coil M 5 60 - 100 6 - 10 50 - 90
Carburettor M 5 30 - 45 3 - 4.5 26 - 40
SERVICE INFORMATION SRM-510ES
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
Grease Gear case
Rewind spring
Starter center post
Oil Oil seal inner lips
Drive shaft
Thread locking sealant Starter case
Muffl er cover
Fuel tank
Top guard
Location
Lithium based grease or ECHO XTended Protection
Lubricant
Two-stroke engine oil or engine oil (SAE#30)
Loctite #242, ThreeBond #1324 or equivalent
Remarks
TM
Page 5
SERVICE INFORMATIONSRM-510ES
5K223 5K224
5K225 5K016 5K042
5K222
5K1895K219 5K220
5K245
5K246
1-5 Service limits
ABCD
EFGH
5
KLM
Description
A Cylinder bore When plating is worn and aluminum can be seen
B
Piston outer diameter Min. 43. 95 (1.730)
C
Piston pin bore Max. 10. 035 (0.3951)
D
Piston ring groove Max. 1. 65 (0.065)
E
Piston ring side clearance Max. 0. 1 (0.004)
F
Piston pin outer diameter Min. 13. 97 (0.5500)
G
Piston ring width Min. 1. 45 (0.057)
H
Piston ring end gap Max. 0. 5 (0.02)
K
Con-rod small end bore Max. 14. 025 (0.5522)
L
Crankshaft runout Max. 0. 02 (0.001)
M
Clutch drum bore Max. 79. 5 (3.13)
mm (in)
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6
1-6 Special tools
1
8
PET-304
2: a
3: a
9:
10:
a
= 4
= 5
= 80
= 70
a
SERVICE INFORMATION SRM-510ES
mm
mm
a
mm
mm
a
4
11
65
12
7
1.65
1.3
0.4
1.5
13
14
= 12
a
15:
= 32
b
= 15
: a
16
= 24.5
b
mm
mm
mm
mm
a
17
18
19
20
ECHO
b
21
22
23
24
25
26
50
0.4
0
0
MPa
1.
27
0.8
1.2
PET-9000
OPPAMA
INTEGRATED IGNITION ANALYZER
Key Part Number Description Used for:
1 G310-000050
Tachometer PET-304
Measuring engine speed to adjust carburettor
2 895610-79920 L-hex wrench (4 mm) Removing and installing hex. socket bolt (M5)
3 895611-79920 L-hex wrench (5 mm) Removing and installing hex. socket bolt (M6)
4 897501-03938 Puller Removing fl ywheel
5 897835-16131 Pressure connector Testing crankcase and cylinder leakages
6 897537-30130 Piston stopper Locking crankshaft rotation
7 897563-19830 Metering lever gauge Measuring metering lever height on carburettor
8 897603-23030 PTO shaft puller Removing PTO shaft
9 897701-02830 Bearing wedge Removing ball bearing remaining on crankshaft
10 897701-06030 Bearing wedge Removing ball bearing on PTO shaft / drive gear
11 897701-14732 Bearing tool
Removing and installing ball bearings on crankcase / clutch drum
12 897702-30131 Piston pin tool Removing and installing piston pin (Use 10mm dia. adapter)
13 897712-04630 2-pin wrench Removing and installing pawl carrier
14 897714-12330 Oil seal tool Installing crankcase oil seal (clutch side)
15 897714-24330 Oil seal tool
Installing crankcase oil seal (starter side) / PTO shaft bearings
16 897726-21430 Oil seal tool Installing crankcase oil seal (clutch side)
17 897718-03930 Bearing tool Installing crankcase oil seal (starter side)
18 897719-02830 Piston holder Making piston steady to remove and install piston / ring
19 363018-00310 Washer Installing crankcase oil seal (starter side)
20 91020 Limiter plug tool Removing and installing limiter plug
21 897800-79931 Spark tester Checking ignition system
22 897803-30132 Pressure tester Testing fuel pipes/tank and crankcase leakages
23 897826-16131 Pressure plug Plugging intake port to test crankcase / cylinder sealing
24 897827-16131 Pressure plate Plugging intake port to test crankcase / cylinder sealing
25 897831-16131 Pressure plug Plugging exhaust port to test crankcase / cylinder sealing
26 91037 Compression gauge Measuring cylinder compression
27
900300
Ignition Analyzer : PET-9000
Measuring Ignition timing, Primary/Secondary voltage engine speed
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SERVICE INFORMATIONSRM-510ES
(E)
(F)
(D)
(G)
2 CARBURETTOR ADJUSTMENT PROCEDURE
2-1 General adjusting rules
A. Before 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. The muffl er exhaust port must be clear of carbon.
4. The fuel lines, tank vent and fuel fi lter are in good condition and clear of debris.
5. 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 (225 mm) properly cut without shield, even if 3-tooth blade is
installed, for proper engine loading to adjust carburettor on both SRM-510ES(L) and SRM-510ES(U).
B.
Adjustment with limiter plugs on carburettor.
Start and run engine for 10 seconds at idle, and for 2 minutes alternating engine speed between WOT for
20 seconds and Idle for 10 seconds. Adjust idle engine speed to 2,800 +/- 200 r/min by turning Idle adjust
screw. Adjust nylon line length to be WOT engine speed within
shield). If engine does not run correctly after this adjustment, proceed to the next step 2-2.
IMPORTANT : After adjusting carburettor according to the steps 2-2 and 2-3, the limiter plug(s) must
be installed in Idle and Hi speed mixture needle(s) hole(s) to comply with Emission Directive.
2-2 Presetting Idle adjust screw, Idle mixture needle and Hi speed mixture needle
Tools Required : Small screwdriver with 2.5 mm
blade, electronic tachometer P/N G310-000050, lim-
(A)
(E)
iter cap tool with 2.5 mm left-hand thread P/N 91020.
Parts Required : (2) limiter plug P/N A259-000000
8,000 +/- 500 r/min (10,000 +/- 500 r/min with
7
(B)
1. Remove plugs from Idle mixture needle hole (A)
and H mixture needle hole (B) using limiter plug
tool (C) as follows.
(1)Put limiter plug tool (C) on limiter plug in mixture needle hole.
(2)Screw limiter plug tool anticlockwise 2 turns into limiter plug pushing the tool against the plug to engage tool
threads.
(3)Pull limiter plug tool, with the limiter plug, from mixture
needle hole.
(4)Repeat plug removal procedure for remaining mixture
needle.
(C)
NOTE :
needle or pin to completely remove plug.
2. Turn Idle mixture needle (D) anticlockwise to
fully come out until clicking sound is heard. Then
turn it clockwise 13 turns. Turn Hi speed mixture
needle (G) clockwise until lightly seated. Then turn
it anticlockwise 3 3/4 turns.
If the plug is difficult to remove, use a
(3)(2)(1)
3. Turn Idle adjust screw (E) anticlockwise until screw tip just touches throttle plate (F). Then turn it in
clockwise 1 1/2 turns.
NOTE :
ed to start and run the engine before fi nal carburettor adjustments are made to conform the unit to meet
Emission Directive are made. The actual number of turns needed for engine operation may vary.
The initial carburettor settings for Idle adjust screw, Idle and Hi speed mixture needles are intend-
Page 8
8
ECHO
ECHO
2-3 Adjusting carburettor
(J)
(D)
SERVICE INFORMATION SRM-510ES
1. Start and warm engine for 1 minute engine
speed at WOT.
NOTE :
needle anticlockwise in 1/2 turn increments.
2. Adjust Idle mixture needle (D) to reach maximum idle speed with 2.5 mm blade screwdriver (J).
3. Set idle speed to 3,500 r/min by turning Idle
adjust screw (E). Engine speed should be stable at
3,500 +/- 50 r/min.
4.
engine idle speed 750 r/min to set idle speed at 2,750
r/min. The idle speed range is 2,700 - 2,800 r/min.
If the engine doesn’t start, turn Idle mixture
Turn Idle mixture needle (D) anticlockwise to reduce
(C)
(H)
(J)
(E)
(G)
NOTE :
a minimum of 20 seconds after each adjustment of
idle mixture needle to assure accurate tachometer
readings.
5. Adjust Hi speed mixture needle (G) to reach
maximum WOT engine speed after 20 seconds at
WOT. Then turn Hi speed mixture needle (G) anticlockwise to reduce WOT engine speed 120 r/min
(RANG : 100-140 r/min).
Max. approx. 8,000 r/min
NOTE :
out shield.
6. SRM-510ES(L) : Stop engine, reinstall shield
and restart engine again and verify engine idle
speed ranges from 2,500 to 3,000 r/min, and WOT
engine speed ranges from 9,500 to 11,000 r/min
after 60 seconds at WOT.
NOTE :
shield.
SRM-510ES(U) : Stop engine, Reinstall shield
for blade and 3-tooth blade (255 mm). Start engine
again and verify engine idle speed ranges from
2,500 to 3,000 r/min, and WOT engine speed ranges from 11,000 to 11,700 r/min after 20 seconds at
WOT.
Engine speed must be allowed to stabilize
Nylon line length should be 225 mm with-
Nylon line length should be 160 mm with
(C)
(H)
Make sure the nylon line cutter/3-tooth blade(255
mm) does not rotate when engine is idle, and engine should accelerate smoothly.
7.
After adjusting carburettor, insert and secure new
plug(s) (H) A259-000000 deep in the needle holes
per the Emission Directive using limiter plug tool (C).
NOTE :
ation may vary from fi nal adjustment specifi cations
due to changing ambient conditions, fuel, and engine loads. Safe engine r/min variances should be
within the safe ranges for WOT and Idling speed
as listed in Section 1-2, otherwise the carburettor
should be readjusted.
Engine WOT, and idle speed in fi eld oper-
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