Husqvarna K770 SmartGuard Manual de instrucciones

Workshop manual

K770 SmartGuard

English

1453 - 001 - 02.04.2020

Contents

1 Introduction

1.1 Document description............................................ 3

1.2 Target group...........................................................3

1.3 Revisions................................................................3

1.4 Safety..................................................................... 3

1.5 Servicing tools........................................................3

2 Safety

2.1 Safety definitions....................................................4

2.2 General safety instructions.....................................4

2.3 Symbols on the product......................................... 4

3 Servicing data

3.1 Symbols in the diagrams........................................5

3.2 Tightening torques................................................. 6

4 Servicing tools

4.1 Servicing tools overview.......................................10

4.2 Servicing tools overview.......................................11

4.3 Servicing tools overview.......................................12

5 Product overview for repair and servicing

5.1 Components.........................................................13

5.2 Basic modules of the product...............................14

6 Repair and servicing

6.1 Starter.................................................................. 22

6.2 Ignition system..................................................... 25

6.3 Flywheel............................................................... 29

6.4 Air filter................................................................. 30

6.5 Fuel system..........................................................31

6.6 Carburetor............................................................ 33

6.7 Decompression valve...........................................42

6.8 Cylinder and piston.............................................. 43

6.9 Piston wear.......................................................... 46

6.10 To assemble the piston...................................... 47

6.11 To assemble the cylinder................................... 48

6.12 Crankcase.......................................................... 48

6.13 Clutch................................................................. 54

6.14 Cutting head.......................................................57

6.15 Wet system........................................................ 65

6.16 Throttle trigger and throttle trigger lockout......... 67

6.17 OilGuard.............................................................68

7 Troubleshooting

7.1 Engine does not start........................................... 70

7.2 Engine stops during operation - no sparks...........71

7.3 Engine stops during operation............................. 71

7.4 Weak output or change of speed......................... 72

7.5 Other engine problems.........................................72

8 Wiring diagram

8.1 Wiring diagram OilGuard......................................73

21453 - 001 - 02.04.2020

1 Introduction

1.1 Document description

This manual gives a full description of how to do

maintenance and repair on the product. It also gives

safety instructions that the personnel must obey.

1.2 Target group

This manual is for personnel with a general knowledge

of how to do repair and do servicing. All personnel that

do repair or do servicing on the product must read and

understand the manual.

1.3 Revisions

Changes to the product can cause changes to the

maintenance work and spare parts. Separate

information is sent out for each change.

Read the manual together with all received information

about changes to maintenance and spare parts for the

product.

1.4 Safety

WARNING: All personnel that repair or do

servicing on the product must read and

understand the safety instructions in this

workshop manual.

1.5 Servicing tools

The manual gives information about necessary servicing

tools. Always use original tools from Husqvarna.

1453 - 001 - 02.04.2020 Introduction - 3

2 Safety

2.1 Safety definitions

The definitions below give the level of severity for each

signal word.

WARNING: Injury to persons.

CAUTION: Damage to the product.

Note: This information makes the product easier to use.

2.2 General safety instructions

• Do not repair the product unless you have read and

understood this workshop manual.

• The service center where the product is repaired

must have safety equipment approved by local

bylaws.

• The product is examined and approved only with the

equipment given or recommended by the

manufacturer.

• Prevent health and safety risks. All personnel must

obey laws and requirements when they do the

procedures given in this manual.

• Obey the local waste regulations.

• Always make sure that all nuts and bolts are

correctly tightened.

• Use protective gloves and eye protection. Goggles

must obey the ANSI Z87.1 for US or EN166 for EU

countries.

• When using compressed air, do not point it to your

body. Air can go into the bloodstream.

• Use hearing protection when the engine is started.

• The product can make sparks and cause ignition of

flammable materials.

• Replace all damaged or missing warning symbol

decals.

• Gasoline and its fumes are poisonous.

• Gasoline can cause damage to the eyes and the

skin.

• Gasoline can cause breathing problems.

• Gasoline is flammable.

2.3 Symbols on the product

WARNING: This product can be

dangerous and cause serious injury or

death to the operator or others. Be careful

and use the product correctly.

Read the operator's manual carefully and

make sure that you understand the

instructions before you use this product.

Use approved protective helmet, hearing

protection, eye protection and respiratory

protection.

This product complies with applicable EC

Directives.

Dust forms when cutting. The dust can

cause injuries if inhaled. Use an approved

respiratory protection. Avoid inhaling

exhaust fumes. Always provide for good

ventilation.

WARNING! Kickbacks can be sudden,

rapid and violent and can cause life

threatening injuries.

Sparks from the cutting blade can cause

fire in fuel, wood, clothes, dry grass or

other flammable materials.

Make sure that the cutting blade does not

have cracks or other damages.

Do not use circular saw blades.

Choke

Air purge bulb

Decompression valve

Starter rope handle

Use a fuel mixture of gasoline and oil.

Note: Other symbols/decals on the product refer to

special certification requirements for some markets.

4 - Safety 1453 - 001 - 02.04.2020

3 Servicing data

3.1 Symbols in the diagrams

Tightening torque, Nm

1453 - 001 - 02.04.2020 Servicing data - 5

3.2 Tightening torques

3-5

4-6

2,0

7-9

3-5

4-6

6 - Servicing data 1453 - 001 - 02.04.2020

11-12

10-12

5-7

11-13

7-9

17-23

1453 - 001 - 02.04.2020 Servicing data - 7

25-30

1-1.5

9-11

1-1.5

38-42

14-16

4-10

6-8

14-16

0.5-0.8

4-6

5-7

8-10

8 - Servicing data 1453 - 001 - 02.04.2020

6-8

20-25

5-6

10-12

5-7

6-8 25-30

9-11

1453 - 001 - 02.04.2020 Servicing data - 9

4 Servicing tools

4.1 Servicing tools overview

0,3 mm

1 2 3

4 5 6

7 8 9

Po-

si-

tion

Designation Used for Order No./

Source

1 Air clearance gauge To adjust the air clearance between the ignition module and the fly-

wheel.

502 51 34-02

2 Assembly punch To assemble the sealing rings of the crankshaft in the crankcase. 502 50 82-01

3 Bearing press To disassemble the primary bearing and assemble the crankshaft. 544 10 36-02

4 Bearing press To assemble the primary bearing and assemble and disassemble

blade shaft bearing and axle.

506 37 61-02

5 Bearing puller Remove the primary bearing from the crankshaft. 531 00 48-67

6 Combination wrench General. 506 38 26-01

7 Compression tester To examine the compression in the cylinder. 531 03 16-86

8 Bearing press To disassemble and assemble the clutch drum ball bearing. 504 56 79-01

9 Cylinder seal To examine the crankcase for leaks. 544 10 33-01

10 - Servicing tools 1453 - 001 - 02.04.2020

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