Echo SRM-4605 User Manual
1
INTRODUCTION
We are constantly working on technical
improvement 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 products information
available at the time of publication.
For further information to service these models,
please refer to ECHO SERVICE MANUAL Ord. No.
402-21.
TRIMMER/BRUSHCUTTER
SRM-3805
SRM-4605
Reference No. 10-37A-00
ISSUED: 199807
SERVICE DATA
1
10-37A-00 SRM-3805, SRM-4605
CONTENTS
page
1 SERVICE INFORMATION ............................. 2
1-1 Specifications ............................................ 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 SERVICE HINT ............................................. 7
2-1 Gear case construction ............................. 7
INDEX
2
SERVICE INFORMATION
SRM-3805
SRM-4605
1 SERVICE INFORMATION
1-1 Specifications
OD: Outer diameter.
ID: Inner diameter.
*Without shoulder harness and cutter head.
**With standard cutter head.
***Install and use U-shaped handle when operating with steel blade.
Model
SRM-3805 (L) SRM-3805 (U) SRM-4605(L) SRM-4605(U)
Dimensions Length* mm(in) 1820 (71.7) 1820 (71.7) 1820 (71.7) 1820 (71.7)
Width mm(in) 360 (14.2) 720 (28.3) 360 (14.2) 720 (28.3)
Height mm(in) 350 (13.8) 455 (17.9) 350 (13.8) 455 (17.9)
Dry weight
**
kg(lb) 8.1 (17.9) 8.7 (19.2) 8.1 (17.9) 8.7 (19.2)
Engine Type KIORITZ, air-cooled, two-stroke, single cylinder
Rotation Counterclockwise as viewed from the output end
Displacement cm
3
(in3) 37.4 (2.284) 45.7 (2.790)
Bore mm(in) 38.0 (1.496) 42.0 (1.654)
Stroke mm(in) 33.0 (1.299) 33.0 (1.299)
Compression ratio 6.3 6.6
Carburetor Type Diaphragm, horizontal-draught
with primer without primer
Model WALBRO WT-297 WALBRO WT-120B
Venturi size-Throttle bore mm(in) 11.11 - 15.85 (0.437 - 0.624) 12.7 - 15.85 (1/2 - 0.624)
Ignition Type Capacitor discharge ignition system
in a single integrated piece
Spark plug Champion RCJ-7Y
Starter Type Automatic rewind
Rope diameter x length mm(in) 3.8 x 950 (0.15 x 37.4)
Fuel Type Premixed two-stroke fuel (Refer to Operator's manual.)
Tank capacity cm
3
(U.S.fl.oz.) 950 (32.1)
Clutch Type Centrifugal, 2-shoe pivot
Handle Type Front Crescent loop U-shaped Crescent loop U-shaped
Rear Integrated --- Integrated ---
control grip control grip
Drive shaft Type Solid
Diameter - Length mm(in) 8 - 1590 (0.31 - 62.6)
Housing OD - ID mm(in) 28 - 24.0 (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
Cutter Type Nylon line cutter, 8-tooth blade***, 80-tooth blade***, Others
Pilot diameter mm(in) 25.4 (1.0)
Fastener type, size mm Left-hand thread nut, M10 x 1.25 pitch
Cutting rotation Counterclockwise as viewed from top
1-2 Technical data
Model SRM-3805 SRM-4605
Engine
Idling speed rpm 2400 - 3000
Operating speed rpm 6000 - 8000
Clutch-in speed rpm 3300 - 3700
Compression pressure, standard kgf/cm
2
(psi) 7.5 (107) 8.0 (114)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage
at 1000 rpm
kV 15
Secondary coil resistance kΩ 1.0 - 1.5
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing °BTDC 25
Carburetor
Type Diaphragm horizontal-draught
Supplier Walbro WT-297 Walbro WT-120B
Venturi Size mm(in) 11.11 (0.437) 12.7 (1/2)
Throttle Bore mm(in) 15.85 (0.624) 15.85 (0.624)
Idle speed screw initial setting
turn in
22
H needle initial setting turn back 1 1/2 1 1/4
L needle initial setting turn back 1 1
Test Pressure, minimum kgf/cm
2
(psi) 0.5 (7.0)
Metering lever height mm(in) 1.65 (0.065) lower than diaphragm seat
BTDC: Before top dead center.
H needle: High speed needle.
L needle: Idle needle.
3
SERVICE INFORMATION
SRM-3805
SRM-4605
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