Husqvarna K 760 OilGuard Gebrauchsanweisung

HUSQVARNA CONSTRUCTION PRODUCTS

Workshop manual

K 760 & K 760 Cut-n-Break

1. LITERATURE 3

2. SPECIAL FUNCTIONAL COMPONENTS 4

3. COMPONENTS – ORIENTATION 5

4. DISMANTLING INTO BASIC MODULES 6

5. STARTER 10

6. IGNITION SYSTEM 13

7. FLYWHEEL 16

8. AIR FILTER 18

9. FUEL SYSTEM 19

10. CARBURETTOR 22

11. DECOMPRESSION VALVE 29

12. CYLINDER/PISTON 30

13. CRANKCASE 36

14. CLUTCH 41

15. CUTTING HEAD 44

16. WET SYSTEM 51

17. HANDLE 52

18. OILGUARD (OPTIONAL) 53

19. K 760 CUT-N-BREAK 54

20. TOOLS 59

CONTENTS Page

HUSQVARNA

K 760

K 760 Cut-n-Break

115 32 40-26

LITERATURE1

Workshop Manual

The workshop manual covers virtually all work

in the workshop that involves the K760 and

K760 Cut-n-Break. Some very simple and rather

obvious repair work has been omitted.

Outline

An introductory section with the title

“Dismantling into Basic Modules” shows how

the machine is dismantled into large component

units, for example, the starter, cutting arm, air

filter, etc.

The manual goes on to describes in detail

through the different chapter how work on the

basic modules should be carried out.

This arrangement means that as a mechanic,

at least until you have learnt the basic composi-

tion of the machine, you need to start with the

chapter “Dismantling into Basic Modules” to

then move on to the chapter covering the speci-

fic service work.

Layout – pictures and text

Besides the pictures and illustrations there is

generally two columns of text. The left-hand text

column is a concise and is suitable for experienced

mechanics, the right-hand column gives a more

detailed description and is targeted at mechanics

with less experience of repair work on the power

cutter.

Contents

The manual is divided into numbered chapters

together with chapter headings that are stated in

bold at the top of each page.

The list of contents also has page references to

the start of each chapter.

Spare parts

K760 and K760 Cut-n-Break

The folders include all spares for Husqvarna

K760 and K760 Cut-n-Break.

The folders contain complete exploded

drawings for the whole machine where the

location, spares number and appearance of

each component is easy to identify.

HUSQVARNA CONSTRUCTION PRODUCTS

Workshop manual

K 760 & K 760 Cut-n-Break

“Dismantling into Basic Modules”

“Cutting head” (Example)

115 32 40-26

IPL, K760 Cut-n-Break, 2009-11, 575 66 02-01

K760 Cut-n-Break

Reservdelar

Spare parts

Ersatzteile

Pieces de rechange

Piezas de repuesto

Ricambi

Peças sobresselente

HUSQVARNA CONSTRUCTION PRODUCTS

575 66 02-01

IPL, K760, 2009-12, 574 48 01-02

K760

Reservdelar

Spare parts

Ersatzteile

Pieces de rechange

Piezas de repuesto

Ricambi

Peças sobresselente

HUSQVARNA CONSTRUCTION PRODUCTS

574 48 01-02

SPECIAL FUNCTIONAL COMPONENTS

X-Torq®

This engine technology was introduced with

its predecessor K750 under the name Dual

Charge, now renamed to X-Torq.

In addition to the intake from the carbu-

rettor with fuel/air mix there are two chan-

nels for intake of fresh air; the upper chan-

nels as shown in the illustration. By directing

the fuel/air mix and the clean air in separate

flushing ducts in the cylinder, the ratios of

fuel mixed air and clean air can be controlled

to ensure that they vary in different phases of

the engine's work cycle.

Cleaner exhaust and better perfor-

mance

The amount of unburned hydrocarbons (HC)

is reduced by approximately 75 % compared

with a traditional design. The emission values

are now clearly under the provisions of

EPAII.

The effect is higher across the whole rev

range, and the torque in the lower rev range

is now considerably higher.

Carburettor

The carburettor has undergone many detail

improvements and a connection to the fuel

chamber has been added for air purge.

Air purge

The pump has a suction function and is con-

nected to the carburettor's fuel chamber. Air

purge empties the fuel chamber of any air

and tops up the fuel chamber with fuel.

With continued pumping any excess fuel is

returned to the tank.

Lower vibration levels

The air filter system and the carburettor are

mounted in the anti-vibration handle device,

which means lower handle vibrations due to

the larger mass (weight) in the handle device.

The carburettor's position in the anti-vibra-

tion section means the carburettor function is

more stable and there is less wear on the car-

burettor's moving parts.

New filter system

The centrifugal cleaning has been significantly

improved with a new flywheel and modified

design of the air intake. The plastic foam fil-

ter from the previous generation is now dis-

continued.

Friction Retarder

The front belt pulley has an inhibiting

mechanism which comes into effect at low

speeds on the cutting blade.

Torx – T27

Torx screw, with the dimension T27, is used

virtually throughout to simplify the service

process.

Note that the screws may have a smooth or

grooved underside.

Torx T27

COMPONENTS – ORIENTATION3

Components

1. Cutting blade

2. Blade guard

3. Handle for the blade guard

4. Front handle

5. Air filter cover

6. Cylinder cover

7. Starter handle

8. Starter

9. Combination spanner

10. Belt adjustment screw

11. Lock screws for belt adjustment

12. Rear belt guard

13. Fuel tank

14. Throttle control

15. Rear handle

16. Throttle trigger lock

17. Air purge

18. Decompression valve

19. Water valve with tool attachment

20. Water connector

21. Choke lever

22. Sight glass for fuel

23. Start throttle lock

24. Stop switch

13 12

Basic modules

This chapter shows how the machine is

built up of basic modules, for example,

the starter, carburettor, air filter system,

etc.

The purpose is to illustrate how you

can easily and effectively dismantle and

assemble the machine in its basic modules.

Service work on a component level, for

example, replacing the starter cord, is

described in detail in respective chapters.

Cutting head

1. Loosen the screws to the cutting head.

(Tightening torque when mounting

18–22 lbf·ft/25–30 Nm.)

2. Loosen the tension of the belt with the

adjuster screw.

3. Detach the hose clip.

4. Remove the screws to the cutting head.

Remove the front belt guard by pushing

it forward.

5. Detach the hose at the water valve.

Lift off the belt from the belt pulley and

remove the cutting head.

6. Loosen the rear belt guard's two screws.

(Tightening torque when mounting

6.6–8.1 lbf·ft/9–11 Nm.)

7. Remove the guard.

DISMANTLING INTO BASIC MODULES 4

Starter

1. Loosen the starter's 4 screws.

2. Remove the starter.

12 3

DISMANTLING INTO BASIC MODULES

Air filter

1. Loosen the guard's three screws and

remove the guard.

2. Loosen the two screws that hold

the filter bottom.

3. Lift up the filter bottom together with

the filter.

4. Press the filter out of the filter bottom.

Cylinder cover

1. Loosen the four screws on the cylinder

cover.

Press together the rubber seal's collar

so that the cylinder cover can be lifted

off.

2. NOTE! When reassembling the rubber

seal must be drawn up through the cover

and the collar then adjusted to fit

correctly against the cover.

Carburettor

1. The carburettor unit is attached to the

cylinder by a single screw. Loosen the

screw.

2. Lift out the carburettor unit. Detach

the petrol hose and the hose to the “air

purge” from the carburettor.

Tip: Tape the throttle control in the

full throttle position to improve access

to the throttle rod's attachment on the

throttle control.

3. Pull the throttle rod out of the con-

trol.

4. The entire carburettor unit can now be

lifted out.

DISMANTLING INTO BASIC MODULES 4

Assembly

5. Hook the throttle rod into the valve

arm as illustrated. Lift the carburettor

unit into position and fit the fuel hose.

Press down the throttle rod into throttle

control with the help of a pair of pliers.

6. Align the carburettor's choke arm in

the blue choke control.

7. Fit the carburettor unit. Align the lug

on the flange with the cut-out on the

cylinder. Tighten the screw at the top.

Carburettor compartment

1. Tank venting

This is dismantled by angling the unit

backwards and then pulling it out the

tank.

2. Stop switch

This is secured by a screw in the carburet-

tor compartment.

3. Controls

The controls in the rear handle become

accessible for service once the carburettor

unit has been dismantled.

Air duct

Start by removing the starter, air filter

cover and cylinder cover.

1. Lower air duct

In order for reassembly to be correct,

note how the cable to the stop switch is

mounted in the air duct. Lift the cable

out of its attachment.

2. Engine's earth point

The engine's earth point to the stop

button is placed here.

3. Upper air duct

3.1 Detach the ignition cable at the spark

plug and lift the cable out of its attach-

ment in the cover.

3.1

DISMANTLING INTO BASIC MODULES4

3.2. Dismantle the three screws on the air

duct cover.

3.3. Lift off the air duct cover.

Muffler

Dismantle the cutting head and the

starter.

1. Dismantle the four screws on the

muffler.

2. Dismantle the muffler.

Fit the gaskets correctly!

3. The insulated fibre gasket should lie

closest to the muffler.

4. Fit the heat shield.

5. The aluminium gasket should lie

against the cylinder.

The screws should be tightened to a

torque of 8.0–9.5 lbf·ft/11–13 Nm.

Vibration dampening

Some service work can be aided by split-

ting the machine by the vibration dampe-

ning element.

Dismantle the air filter unit, cylinder

cover and upper the air duct cover.

Dismantle the screw holding the carbu-

rettor. Dismantle the starter and the air

duct cover. Loosen the cable lug by the

ignition module and unscrew the cable

to the earth point. Pull off the water hose

by the valve.

The engine unit is attached to the

handle unit at three points with the vib-

ration dampening element in the form of

springs. Dismantle the screws located by:

1. The lower section on the flywheel side.

2. The base on the clutch side.

3. The handle loop next to the water

valve.

To gain access to the spring's inner

screw, Torx T27, the tool diameter must

be max. 5 mm. The combination spanner

fits.

1 2

345

123

3.2 3.3

STARTER 5

Replacing the starter cord

Dismantle the starter.

Eliminate the spring force from

the return spring

1. Pull out the starter cord approximately

12 in./30 cm. Hold the starter pulley

with your thumb and place the cord in

the cut-out on the starter pulley.

2. Let the starter pulley rotate slowly and

wind up the cord on the metal sleeve.

3. Lift off the cord from the starter

pulley.

Attach the new starter cord

The starter cord should be 45 in./

115 cm long and have a diameter of

.16 in./4 mm.

1. Insert one end of the cord from the

top through the hole in the starter pulley

and then out through the notch for the

cord. Pull out virtually the whole cord

length until sufficient cord remains to tie

a knot as illustrated.

2. Insert the other end through the cover

and on through the handle. Tie a double

knot as illustrated.

Loading the return spring

1. Fit the starter cord in the cut-out.

2. Wind the start cord 4 turns around the

hub and pull out the starter handle and

release so that the cord is wound into the

starter pulley. Repeat the procedure with

3 turns of cord around the hub.

Important check!

Check that the return spring does not act

as an end stop by extending the cord

fully. In this position it should be possible

to turn the starter pulley a least a further

half turn before the spring stops the

movement.

Andere Handbücher für K 760 OilGuard

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