Echo PB-251 Service Data
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Echo PB-251 Service Data

Power blower
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See also: Operator's Manual
21-25F-00
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 products infor-
mation available at the time of publication.
INDEX
PB-251, PB-255ES, ES-255ES
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 hi speed (H) mixture needle .......................... 7
2-3 Adjusting carburettor................................... 8
CONTENTS
21-25F-00
Reference No.
I S S U E D :
2 0 0 8 0 1
1
2
page

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Summary of Contents for Echo PB-251

  • Page 1: Table Of Contents

    PB-251, PB-255ES, ES-255ES 21-25F-00 CONTENTS INTRODUCTION page We are constantly working on technical im- 1 SERVICE INFORMATION ......2 provement of our products. For this reason, 1-1 Specifi cation ..........2 1-2 Technical data ..........3 technical data, equipment and design are 1-3 Torque limits..........

  • Page 2: Service Information

    PB-251 PB-255ES SERVICE INFORMATION ES-255ES 1 SERVICE INFORMATION 1-1 Specifi cations Model PB-251 PB-255ES ES-255ES Dimensions Length* mm(in) 340 (13.4) Width* mm(in) 265 (10.4) 260 (10.2) Height mm(in) 350 (13.8) Dry weight with blower pipe** kg(lb) 4.5 (9.9) 4.8 (10.5) with vacuum pipe and bag*** kg(lb) 5.9 (12.9)

  • Page 3: Technical Data

    PB-251 PB-255ES ES-255ES SERVICE INFORMATION 1-2 Technical data Model PB-251 PB-255ES ES-255ES Engine Idling speed r/min 2800 - 3400* 2700 - 3300* 2500 - 3100** Wide open throttle speed r/min 7200 - 7500* 6000 - 6500** Compression pressure MPa (kgf/cm ) (psi) 0.87 (8.9) (126)

  • Page 4: Torque Limits

    Location Remarks Thread locking sealant Engine mount Loctite # 242, ThreeBond 1324 or equivalent Fun hub Starter pawl Loctite # 222, ThreeBond 1342 or equivalent Muffl er cover Grease Rewind spring Lithium based grease or ECHO LUBE Starter centre shaft...

  • Page 5: Service Limits

    PB-251 PB-255ES ES-255ES SERVICE INFORMATION 1-5 Service limits 5K204 5K263 5K264 5K265 5K266 5K016 5K017 5K267 5K219 5K171 Description mm (in) Cylinder bore When plating is worn and aluminium can be seen Piston outer diameter Min. 33.91 (1.335) Piston pin bore Max.

  • Page 6: Special Tools

    PB-251 PB-255ES SERVICE INFORMATION ES-255ES 1-6 Special tools Key Part Number Description Used for: 897801-33330 Tachometer PET-1000 Measuring engine speed 363018-00310 Washer Installing crankcase oil seal of starter side 895610-79920 L-hex wrench (4 mm) Removing and installing hex. socket bolts (M5)

  • Page 7: Carburettor Adjustment Procedure

    PB-251 PB-255ES ES-255ES 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.

  • Page 8: Adjusting Carburettor

    2. Adjust idle mixture needle (A) with 2.5 mm blade screwdriver (E) to reach maximum engine speed just before drop off. 3. Set idle speed to 3,500 r/min on PB-251, to 3,400 r/min on PB-255ES and ES-255ES by turning idle adjust screw (D). Engine speed should be stable...

This manual is also suitable for:

Pb-255esEs-225es

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