Husqvarna K 750 Manuel d'instructions

HUSQVARNA CONSTRUCTION PRODUCTS

Workshop manual

K 750

1. LITERATURE 2

2. SPECIAL FUNCTIONAL COMPONENTS 3

3. COMPONENTS – ORIENTATION 4

4. DISMANTLING INTO BASIC MODULES 5

5. STARTER 9

6. IGNITION SYSTEM 12

7. FLYWHEEL 15

8. AIR FILTER 17

9. FUEL SYSTEM 18

10. CARBURETTOR 21

11. DECOMPRESSION VALVE 28

12. CYLINDER/PISTON 29

13. CRANKCASE 35

14. CLUTCH 40

15. CUTTING HEAD 44

16. FRICTION RETARDER 49

17. HANDLE 51

18. TOOLS 52

CONTENTS Page

HUSQVARNA

K 750

502 53 08-26

LITERATURE1

Workshop Manual

The Workshop Manual includes virtually

all workshop procedures that can come into

question on the K750. Some very simple and

self-evident repairs have 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

Spare parts K750

The folder includes all the spare parts for

Husqvarna K750.

The folder contains complete exploded views

of the entire machine where each component's

placement, spare part number and appearance

can be easily identified.

HUSQVARNA CONSTRUCTION PRODUCTS

Workshop manual

K 750

“Dismantling into Basic Modules”

“Cutting head” (Example)

502 53 08-26

SPECIAL FUNCTIONAL COMPONENTS

New technical solutions

Husqvarna K750 is the first model in a new

generation of power cutters with a number of

new technical solutions:

New engine technology – Dual

Charge

The cylinder, piston and carburettor are

radically changed.

Apart from the inlet from the carburettor

with fuel-air mixture there are two ducts for

the inlet of clean air, the top duct in the pic-

ture. By leading the fuel-air mixture and the

clean air in separate flushing channels into

the cylinder, the proportions of the air-fuel

mixture and clean air can be controlled so

that these vary in different phases of the

engine's work cycle.

Cleaner exhaust fumes and improved

performance

The amount of uncombusted hydrocarbons

(HC) is reduced by the Dual Charge techno-

logy to about a third compared with a tradi-

tional design (K700). The emission values are

now well below levels in the regulations from

EPAII.

The output is higher over the entire speed

range and the torque in the lower speed range

is now significantly higher.

Lower vibration levels

The air filter system and the carburettor are

mounted in the dampened handle unit,

which means lower vibration on the handle

through the greater mass (weight) in the

handle unit.

The carburettor placement in the dampened

section results in stable carburettor function

and less wear on the moving parts in the car-

burettor.

New muffler

The volume of the muffler has now been

doubled and both the sound pressure and

sound power have been halved, all in compa-

rison with K700

Poly-V belt

This type of belt has improved strength and

is more resilient against stretching than

previous V-belts, which results in longer inter-

vals between adjustments.

Friction Retarder

A new front belt pulley is being introduced in

2007 with a braking mechanism that takes

effect at low speeds.

Torx – T27

Torx screws, with the dimensions T27, are

used virtually throughout to simplify the ser-

vice work.

Note that screws with both a flat and fluted

undersides are used.

Torx T27

COMPONENTS – ORIENTATION3

Components

1. Cutting blade

2. Blade guard

3. Adjustable 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. Cutting arm/rear belt guard

13. Fuel tank

14. Throttle control

15. Rear handle

16. Throttle trigger lock

17. Water valve with tool attachment

18. Water connector

19. Choke Lever

20. Sight glass for fuel

21. Start throttle lock

22. Stop switch

13 1214

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 arm

1. Loosen the screws on the cutting head.

2. Slacken off the belt tension using the

adjuster screw. Dismantle the screws on

the cutting head.

3. Dismantle the front belt cover by

sliding it forwards.

4. Loosen the hoses by the water valve.

Lift off the belt from the pulley and

remove the cutting head.

5. Loosen the two screws on the rear belt

guard.

(Tightening torque when assembling

6.6–8.1 lbf·ft/9–11 Nm.)

6. Remove the guard.

DISMANTLING INTO BASIC MODULES 4

Starter

1. Loosen the 4 screws on the guard.

2. Dismantle the starter.

DISMANTLING INTO BASIC MODULES

Air filter

1. Loosen the three screws on the air

filter cover and remove the cover.

2. Lift off the filter base.

3. Carefully lift up the paper filter so

that the dust does not fall down onto the

service filter.

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 up the carburettor unit. Loosen

the fuel hose (arrow) from the carburet-

tor.

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

First dismantle the starter.

1. Lower air duct

Note, to facilitate reassembly, how the

cable to the stop switch is fitted in the

air duct. Lift the cable out of its

mounting.

2. Upper air duct

Loosen the ignition lead by the spark

plug and lift the cable out of its

mounting in the cover.

3. The engine's earth point

The engine's earth point to the stop

button is located here

DISMANTLING INTO BASIC MODULES4

3. Dismantle the three screws on the air

duct cover.

4. 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 tor-

que 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.

345

123

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.

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 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.

2. Let the starter pulley rotate

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.

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