Yamabiko ECHO PB-2520 Service Manual
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Yamabiko ECHO PB-2520 Service Manual

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PB-2520
ECHO:
EB252
shindaiwa:
(Serial number: 37000001 and after)
Ref. No. 403-20
Copyright(C)2018 YAMABIKO Corporation All rights reserved.

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  • Page 1 PB-2520 ECHO: EB252 shindaiwa: (Serial number: 37000001 and after) Ref. No. 403-20 Copyright(C)2018 YAMABIKO Corporation All rights reserved.
  • Page 2 INTRODUCTION This service manual contains information for service and maintenance of ECHO HANDHELD BLOWER, model PB-2520 and shindaiwa HANDHELD BLOWER, model EB252. For systematic diagnosis, to avoid extra work, time loss and to meet Emission regulation, please refer to “Troubleshooting guide” that describes problems, testing, remedies and references.

  • Page 3: Table Of Contents

    PB-2520 EB252 TABLE OF CONTENTS Page Page 1 SERVICE INFORMATION ........2 6 FUEL SYSTEM ...........30 Speci cations ...........2 Inspecting air lter ..........31 Technical data ..........3 Inspecting fuel cap and fuel strainer....31 Torque limits .............4 Inspecting fuel tank and line ......32 Special repairing materials .......4 Inspecting and replacing tank vent ....33 Service limits ............5...

  • Page 4: Service Information

    (in) 233 (9.2) Height mm (in) 355 (14.0) Dry weight** kg (lb) 3.9 (8.6) Engine Type YAMABIKO, air-cooled, two-stroke, single cylinder Rotation Counterclockwise as viewed from the output end Displacement 25.4 (1.550) Bore mm (in) 34 (1.339) Stroke mm (in) 28 (1.102)

  • Page 5: Technical Data

    PB-2520 EB252 SERVICE INFORMATION 1-2 Technical data Engine Compression pressure MPa (kgf/cm ) (psi) 0.77 (7.8) (111) 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) Tester gap w/o spark plug mm(in) 6.0 (0.24) Secondary coil resistance...

  • Page 6: Torque Limits

    PB-2520 EB252 SERVICE INFORMATION 1-3 Torque limits Descriptions Size kgf•cm N•m in•lbf Starter system Starter pulley 70 - 110 7 - 11 60 - 95 Starter case 50 - 70 5 - 7 45 - 60 Ignition system Magneto rotor (Flywheel) 160 - 200 16 - 20 140 - 175...

  • Page 7: Service Limits

    PB-2520 EB252 SERVICE INFORMATION 1-5 Service limits Description mm (in) A Cylinder bore When plating is worn and aluminum can be seen B Piston outer diameter Min. 33.91 (1.335) C Piston pin bore Max. 9.035 (0.3557) D Piston ring groove Max.

  • Page 8: Special Tools

    PB-2520 EB252 SERVICE INFORMATION 1-6 Special tools Part Number Description Reference PET304 Tachometer PET-304 Measuring engine speed to adjust carburetor X602-000340 Torx wrench (T27) Removing and installing bolt 91020 Limiter plug tool Removing and installing limiter plug 10001-418430 Washer Installing crankcase oil seals Y089-000111 Puller Removing magneto rotor...

  • Page 9: Starter System

    PB-2520 EB252 STARTER SYSTEM 2 STARTER SYSTEM (A) E-ring (B) Pawl carrier (C) Spring (D) Starter pawl (E) Screw with washer (F) Starter rope (G) Rope reel (H) Rewind spring (J) Starter grip (K) Rope guide (L) Starter case...

  • Page 10: Disassembling Starter Assembly

    PB-2520 EB252 STARTER SYSTEM 2-1 Disassembling starter assembly 1. Remove three bolts (A) and remove starter as- sembly (B) from unit. 2. Pull out starter rope about 30cm (12in) and hold rope reel (C) by hand. Loop excess rope in rope reel notch (c) as shown.

  • Page 11: Replacing Starter Rope

    PB-2520 EB252 STARTER SYSTEM 2-2 Replacing starter rope 1. Pull out knot (A) from starter grip and untie knot (A). 2. Pull knot (B) to remove rope from rope reel (C). 3. When installing a new starter rope, singe both ends of the rope to prevent fraying.

  • Page 12: Installing Rewind Spring

    PB-2520 EB252 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 unwinds unexpectedly, follow steps 1) to 4). 1) Wind rewind spring (A) by hand. Then draw out the end of spring (A) as shown.

  • Page 13: Assembling Starter

    PB-2520 EB252 STARTER SYSTEM 2-4 Assembling starter 1. Assemble rope reel (A) engaging hook (a1) with hook (b) of rewind spring (B). 2. Check for proper engagement of rewind spring and rope reel (A) by turning rope reel (A) clockwise and counterclockwise.

  • Page 14: Replacing Starter Pawl

    PB-2520 EB252 STARTER SYSTEM 2-5 Replacing starter pawl 1. Remove starter assembly from unit (Refer to “2-1 Disassembling starter assembly”). Check starter pawl (A) and spring (B). If defective, replace them as follows. 2. Disconnect spark plug cap and remove spark plug.

  • Page 15: Blower System

    PB-2520 EB252 BLOWER SYSTEM 3 BLOWER SYSTEM (A) Fan case grid (B) Outer fan case (C) Fan (D) Inner fan case...

  • Page 16: Inspecting Fan And Fan Case

    PB-2520 EB252 BLOWER SYSTEM 3-1 Inspecting fan and fan case 1. Remove blower pipe. 2. Inspect outer fan case (A) and inner fan case (B) for crack or damage. If defective, replace them with new ones (Refer to “3-2 Disassembling fan and fan case”, “3-3 Assembling fan and fan case”).
  • Page 17 PB-2520 EB252 BLOWER SYSTEM 3-2 Disassembling and assembling fan and fan case (continued) 4. Remove two bolts (D). 5. Assemble fan (E) with two bolts (d). 6. Assemble outer fan case with seven bolts. To assemble fan case grid (F), push tab (f) of fan case grid (F) in place.
  • Page 18 PB-2520 EB252 BLOWER SYSTEM 3-2 Disassembling and assembling fan and fan case (continued) To install fan case grid (B), push tab (b2) on grid (B) with hammer as shown.

  • Page 19: Ignition System

    PB-2520 EB252 IGNITION SYSTEM 4 IGNITION SYSTEM (A) Ignition switch (B) Ignition switch knob (C) Spark plug cap coil (D) Spark plug cap (E) Spark plug (F) Ignition module (G) Flywheel...

  • Page 20: Troubleshooting Guide

    PB-2520 EB252 IGNITION SYSTEM 4-1 Troubleshooting guide Start Remedy Inspect S.T. Pole shoe air Adjust pole shoe air gaps. gaps Clean / Regap / Spark plug S.T. Replace. Flywheel Replace flywheel. magnet Spark Replace. S.T. plug cap/ coil S.T. R.T. Ignition Replace.

  • Page 21: Testing Spark

    PB-2520 EB252 IGNITION SYSTEM 4-2 Testing spark 1. Disconnect spark plug cap (A) from spark plug (B). 2. Connect spark plug cap to spark tester 897800- 79931 (C), and connect spark tester lead (c1) on spark plug as shown. 3. Screw in adjuster (c2) until the needle tips con- tact.

  • Page 22: Replacing Spark Plug Cap And Coil

    PB-2520 EB252 IGNITION SYSTEM 4-4 Replacing spark plug cap and coil 1. Disconnect spark plug cap (A) from spark plug. 2. Apply some oil in spark plug cap (A) for easy re- moval from high tension lead (B). 3. Pull spark plug cap away from high tension lead. 4.

  • Page 23: Inspecting Ignition Module

    PB-2520 EB252 IGNITION SYSTEM 4-5 Inspecting ignition module 1. Remove spark plug cap (A) from spark plug. 2. Connect black probe (b1) of Ohm-meter or mul- timeter (B) to spark plug cap coil in spark plug cap (A). 3. To measure secondary coil resistance, con- tact cylinder n with red probe (b2).

  • Page 24: Replacing Ignition Module

    PB-2520 EB252 IGNITION SYSTEM 4-6 Replacing ignition module 1. Remove air cleaner cover (A) as shown. 2. Disconnect fuel line (B) and fuel return line (C) from carburetor(H). 3. Remove air lter (D), two bolts (E), prevent plate (F), air cleaner case (G), carburetor (H) and intake gasket (J).
  • Page 25 PB-2520 EB252 IGNITION SYSTEM 4-6 Replacing ignition module (continued) 7. Remove two bolts (Q) and muf er (R). 8. Remove outer fan case and fan referring to “3-2 Disassembling fan and fan case”. 9. Remove four bolts (S) and engine assembly from inner fan case (T).

  • Page 26: Setting Pole Shoe Air Gaps

    PB-2520 EB252 IGNITION SYSTEM 4-7 Setting pole shoe air gaps 1. Insert Module air gap gauge: 91004 (A) or 0.3 - 0.4 mm (0.012 - 0.016 in) thick feeler gauge be- tween ywheel (B) and ignition module shoes. 2. Rotate ywheel until magnetic poles of ywheel face ignition module shoes.

  • Page 27: Replacing Ignition Switch

    PB-2520 EB252 IGNITION SYSTEM 4-9 Replacing ignition switch 1.Remove ignition module (A).(Refer to 4-6 “Re- placing ignition module“) NOTE: When replacing ignition switch knob (b2) and ignition switch (B), begin from step 2. When replacing entire ignition switch (B) , go to step 4. 2.

  • Page 28: Inspecting Ywheel Magnetic Force

    PB-2520 EB252 IGNITION SYSTEM 4-10 Inspecting fl ywheel magnetic force 1. Inspect magnetic force of ywheel (A) using ux meter, or bridging with a screwdriver (B) as shown. 2. If magnetic force is weak, replace ywheel refer- ring to “4-11 Replacing ywheel and key”. 4-11 Replacing fl...
  • Page 29 PB-2520 EB252 IGNITION SYSTEM 4-11 Replacing ywheel and key(continued) 5. To remove ywheel(D), set puller Y089-000111 (C) on ywheel (D) as shown. 6. Tighten two nuts (c1) on the puller alternately to remove ywheel (D). 7. Check cast groove (E) and woodruff key (F) for damage.

  • Page 30: Handle And Control System

    PB-2520 EB252 HANDLE AND CONTROL SYSTEM 5 HANDLE AND CONTROL SYSTEM ( A ) Inner fan case ( B ) Throttle lever ( C ) Throttle trigger ( D ) Throttle rod ( E ) Engine cover ( F ) Carburetor...

  • Page 31: Disassembling And Assembling Handle And Control Parts

    PB-2520 EB252 HANDLE AND CONTROL SYSTEM 5-1 Disassembling and assembling handle and control parts 1. Remove engine cover from inner fan case (A) (Refer to “4-6 Replacing ignition module“). 2. Remove throttle rod (B) from throttle trigger (C). 3. Remove throttle trigger (C) from inner fan case (A).

  • Page 32: Fuel System

    PB-2520 EB252 FUEL SYSTEM 6 FUEL SYSTEM ( A ) Air cleaner cover ( B ) Air lter ( C ) Prevent plate ( D ) Air cleaner case ( E ) Carburetor ( F ) Intake gasket ( G ) Intake insulator ( H ) Intake gasket ( J ) Fuel cap ( K ) Gasket...

  • Page 33: Inspecting Air Lter

    PB-2520 EB252 FUEL SYSTEM 6-1 Inspecting air fi lter 1. Close choke shutter. Remove air cleaner cover and air lter. 2. Inspect air filter. If blocked with dirt or dust, remove the obstruction with compressed air or brush. WARNING DANGER Wear eye protection when working with compressed air.

  • Page 34: Inspecting Fuel Tank And Line

    PB-2520 EB252 FUEL SYSTEM 6-3 Inspecting fuel tank and line 1. Clean fuel tank inside as required. 2. Disconnect black fuel line (A) from carburetor and connect pressure tester 897803-30133 (B) to fuel line (A) by pipe joint V186-000510 (C). 3.

  • Page 35: Inspecting And Replacing Tank Vent

    PB-2520 EB252 FUEL SYSTEM 6-4 Inspecting and replacing tank vent NOTE: Tank vent prevents a vacuum from forming in fuel tank when fuel in fuel tank is being con- sumed. When pressure in fuel tank becomes too high, tank vent releases the pressure. 1.
  • Page 36 PB-2520 EB252 FUEL SYSTEM 6-4 Inspecting and replacing tank vent (continued) NOTE: Inspection using 897803-30133 If pressure tester 91139 is not available, tank vent can be inspected with pressure tester 897803- 30133 as follows. 1. Connect tank vent (A) to pressure tester 897803-30133 (B).

  • Page 37: Replacing Fuel Line, Fuel Return Line, Tank Vent Line And Grommet

    PB-2520 EB252 FUEL SYSTEM 6-5 Replacing fuel line, fuel return line, tank vent line and grommet 1. Disconnect fuel line assembly (A) and fuel return line (B) from carburetor. 2. Pull tank vent line (C) and remove tank vent (D). 3.

  • Page 38: Adjusting Carburetor

    PB-2520 EB252 FUEL SYSTEM 6-6 Adjusting carburetor 6-6-1 General adjusting rules A. Before adjustment, check the following items. 1. The correct spark plug must be clean and properly gapped. 2. The air lter element must be clean and properly installed. 3.

  • Page 39: Initial Setting Throttle Adjust Screw, L Mixture Needle And H Mixture Needle

    PB-2520 EB252 FUEL SYSTEM 6-6-2 Initial setting Throttle adjust screw, L mixture needle and H mixture needle (continued) 2. Turn H mixture needle (B) clockwise (CW) un- til lightly seated. And then turn H mixture needle CCW 1 3/4 turns. Turn L mixture needle (A) clock- wise until lightly seateds.

  • Page 40: Inserting Limiter Plugs

    PB-2520 EB252 FUEL SYSTEM 6-6-4 Inserting limiter plugs After adjusting carburetor, insert and secure new plugs (F) P005-001270 deep in the needle holes per the Emission regulation using appropriate tool (G). NOTE : Engine WOT, and idle speed in eld oper- ation may vary from nal adjustment speci cations due to changing ambient conditions, fuel, and en- gine loads.

  • Page 41: Testing Carburetor

    PB-2520 EB252 FUEL SYSTEM 6-7 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. 2. Disconnect black fuel line from carburetor and connect pressure tester 897803-30133 (A) to fuel inlet of carburetor.

  • Page 42: Inspecting Crankcase Pulse Passage

    PB-2520 EB252 FUEL SYSTEM 6-8 Inspecting crankcase pulse passage 1. Drop a little oil in pulse hole (A) on intake insula- tor. 2. Remove spark plug and pull starter grip several times. Oil should spit back from the hole. 3. If not, inspect whether pulse passage is clogged. Repair or replace as required.

  • Page 43: Inspecting Inlet Needle Valve

    PB-2520 EB252 FUEL SYSTEM 6-10 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. NOTE: Causes of fuel ooding from carburetor to cylinder are as follows: - Improper assembling of metering lever and...

  • Page 44: Installing Carburetor

    PB-2520 EB252 FUEL SYSTEM 6-12 Installing carburetor 1. Set intake gasket (A) between intake insulator and carburetor (B). 2. Connect fuel line (C) to fuel inlet of carburetor (B). Connect fuel return line (D) to fuel outlet of carburetor(B). 3. Connect throttle rod (E) to carburetor (B). 4.

  • Page 45: Engine

    PB-2520 EB252 ENGINE 7 ENGINE ( A ) Cylinder ( B ) Cylinder gasket ( C ) Piston ring ( D ) Piston ( E ) Snap ring ( F ) Needle bearing ( G ) Piston pin spacer ( H ) Crankcase ( J ) Oil seal ( K ) Dowel pin ( L ) Ball bearing...

  • Page 46: Testing Cylinder Compression

    PB-2520 EB252 ENGINE 7-1 Testing cylinder compression NOTE: Test cylinder compression when engine is cold. 1. Set ignition switch to STOP position and remove 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 47: Inspecting Muf Er And Exhaust Port

    PB-2520 EB252 ENGINE 7-3 Inspecting muffl er and exhaust port 1. Remove muf er. 2. Inspect cylinder exhaust port (A) and clean the port (A) using wooden or plastic stick if carbon is found. NOTE: When cleaning exhaust port, always posi- tion piston at Top Dead Center (TDC) to prevent carbon from entering cylinder.

  • Page 48: Testing Crankcase And Cylinder Sealings

    PB-2520 EB252 ENGINE 7-4 Testing crankcase and cylinder sealings 1. Remove carburetor. 2. To seal intake port and crankcase pulse pas- sage, install pressure rubber plug 897826-16131 (A) and pressure plate 897827-16131 (B) with M5 bolts (C) of length 40-45 mm (1.6-1.8 in). 3.

  • Page 49: Replacing Oil Seal

    PB-2520 EB252 ENGINE 7-5 Replacing oil seal Oil seal section 1. Pry defective oil seal from engine. Dust lip NOTE: Be careful not to damage housing of oil seal in crankcase. 2. Apply grease on dust lip and seal lip of new oil seal (A) to avoid damage of lips while inserting Seal lip crankshaft into oil seal.

  • Page 50: Inspecting Piston And Piston Ring

    PB-2520 EB252 ENGINE 7-7 Inspecting piston and piston ring 1. Inspect piston ring (A) and replace it if broken, scored, or exceeded service limits (Refer to “1-5 Service limits”). 2. Inspect piston crown (B). Clean with ne sand paper, oil stone, and soft cleaning brush (C) if car- bon is found.

  • Page 51: Replacing Ball Bearings

    PB-2520 EB252 ENGINE 7-9 Replacing ball bearing 1. Check main ball bearing for smooth rotation, after disassembling crankshaft. If rough, replace it (them) with new one. 2. Pry oil seal from crankcase. 3. Remove main ball bearing from crankcase half using bearing tool 897701-14732 as follows.

  • Page 52: Assembling Crankshaft And Crankcase

    PB-2520 EB252 ENGINE 7-10 Assembling crankshaft and crankcase 1. Clean mating surface of each crankcase half. 2. Heat ball bearing for easier installation. Then insert crankshaft starter end (A) into starter side crankcase half (B) until properly seated. WARNING DANGER When using a heat gun, wear gloves.

  • Page 53: Installing Piston Ring And Cylinder

    PB-2520 EB252 ENGINE 7-12 Installing piston ring and cylinder 1. Install piston ring on piston ensuring that locat- ing pin (A) is positioned between ring ends. 2. Set new cylinder gasket (C) on crankcase (D). NOTE: When setting cylinder gasket (C), it is con- venient to apply Loctite #222, ThreeBond 1324 or equivalent on several spots of the bottom of cylin- der gasket (C) to x it on crankcase temporarily.

  • Page 54: Assembling Engine Assembly And Other Parts

    PB-2520 EB252 ENGINE 7-13 Assembling engine assembly and other parts Assemble engine assembly and other parts, referring to the following instructions. 1. Assembling ywheel and woodruff key: “4-11 Replacing ywheel and key” 2. Assembling engine assembly, control system and switches: “4-5 Inspecting ignition module”, “4-6 Replacing ignition module”, “4-8 Inspecting ignition switch”, “4-9 Replacing ignition switch”...

  • Page 55: Maintenance Guide

    PB-2520 EB252 MAINTENANCE GUIDE 8 MAINTENANCE GUIDE 8-1 Disassembly chart Starter Spark Air cleaner assembly plug cover (2-1) Fan case Pawl cover carrier Air filter (3-2) (2-5) (6-1) Blower fan Carburetor (3-2) (6-6 ~ 6-12) Intake Engine cover insulator (4-6) Throttle Ignition Ignition...

  • Page 56: Troubleshooting Guide

    PB-2520 EB252 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. Fuel consumption is excessive.
  • Page 57 PB-2520 EB252 MAINTENANCE GUIDE 8-2 Troubleshooting guide (continued) INSPECTING REFERENCES Inspecting first. Fuel system / Carburetor 13 12 11 10 09 08 07 06 05 04 03 02 01 Air filter Fuel cap / strainer Fuel tank / vent / line 6-3 to 6-5 Carburetor adjustment Carburetor leakage...

  • Page 58: Service Intervals

    PB-2520 EB252 MAINTENANCE GUIDE 8-3 Service intervals Intervals Inspecting point Service Reference Daily 3 months 6 months Before use 100 hours 300 hours Screws and bolts * Retighten / Replace Air lter Inspect / Clean Choke system Inspect / Clean Carburetor Inspect / Repair 6-6 to 6-13...
  • Page 60 Published by YAMABIKO Corp. Tokyo Japan 1804...

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Shindaiwa eb252

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