How it Works
Husqvarna
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K 770
User Manual
148 pgs5.59 Mb1
Table of contents
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Husqvarna K 770 User Manual

K 770, K 770 OilGuard, K 770 Rescue, K 770
SmartGuard
EN Operator's manual 2-35 DE Bedienungsanweisung 36-73 FR Manuel d'utilisation 74-110 NL Gebruiksaanwijzing 111-146

Contents

1
10
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Introduction..................................................................... 2
Safety..............................................................................6
Assembly...................................................................... 11
Operation...................................................................... 16
Maintenance................................................................. 24

Product description

These Husqvarna, K 770, K 770 OilGuard, K 770 Rescue and K 770 SmartGuard power cutters are portable handheld cut-off machines powered by 2-stroke combustion engines.

Intended use

The product is used to cut hard materials as concrete, masonry, stone and steel. Do not use the product for

Product overview K 770, K 770 OilGuard

Troubleshooting............................................................ 31
Transportation, storage and disposal........................... 32
Technical data.............................................................. 33
Accessories.................................................................. 34
EC Declaration of Conformity....................................... 35
other tasks. The product must only be used by professional operators with experience.
Work is constantly in progress to increase your safety and efficiency during operation. Speak to your servicing dealer for more information.
Note: National/Local regulations could restrict the use of this product.
1. Operator’s manual 2. Front handle
2 1447 - 001 - 16.04.2020
3. Water valve
2
3
4
6
7
8
9
11
12
10
13
15
16
17
18
19
21
22
23
25
26
27
1
20
5
14
24
4. Information and warning decal
5. Air filter cover
6. Start instruction decal
7. Choke control
8. Throttle lockout
9. Throttle trigger
10. Stop switch
11. Engage/Disengage OilGuard (Only K 770 OilGuard)
12. Starter rope handle
13. Starter housing
14. Muffler
15. Cutting equipment decal
16. Flange, spindle, arbor bushing

Product overview K 770 Rescue

17. Adjustment handle for blade guard
18. Blade guard
19. Decompression valve
20. Air purge bulb
21. Fuel tank cap
22. Water connection with filter
23. Belt guard
24. Belt tensioner
25. Type plate
26. Cutting arm
27. Cutting head
28. Cutting blade (not supplied)
29. Combination wrench
30. Water connector, GARDENA
®
1. Operator's manual
2. Front handle
3. Warning decal
4. Air filter cover
5. Start instruction decal
6. Choke control
7. Throttle lockout
8. Throttle trigger
9. Stop switch
10. Starter rope handle
11. Starter housing
12. Muffler
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13. Cutting equipment decal
14. Flange, spindle, arbor bushing
15. Adjustment handle for blade guard
16. Blade guard
17. Decompression valve
18. Air purge bulb
19. Fuel tank cap
20. Shoulder strap
21. Belt guard
22. Belt tensioner
23. Type plate
24. Cutting arm
25. Cutting head
26
2
3
4
21
24
23
6
7
28
18
20
19
16
15
14
17
12
11
22
1
9
13
25
27
5
10
29
8
26. Cutting blade (not supplied)

Product overview K 770 SmartGuard

27. Combination wrench
1. Operator's manual
2. Air filter cover
3. Information and warning decal
4. Front handle
5. Combination wrench
6. SmartGuard
7. Front belt guard
8. Decompression valve
9. Belt tensioner
10. Rear belt guard
11. Air purge bulb
12. Fuel tank cap
13. Water connection with filter
14. Stop switch
15. Throttle trigger
16. Throttle lockout
17. Choke control
18. Cutting equipment decal
19. Flange, spindle, arbor bushing
20. Cutting blade (not supplied)
21. SmartGuard handle
22. Blade guard
23. Adjustment handle for blade guard
24. Water valve
25. Rear handle
26. Starter rope handle
4 1447 - 001 - 16.04.2020
27. Starter housing
28. Muffler
29. Water connector GARDENA

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. Refer to
equipment on page 8
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.
®
Personal protective
.
WARNING! Kickbacks can be sudden, rapid
1
2
3
4
5 5
XXXXXXXXX YYYY
s / n YYYY WWXXXXX
XXX XX XX-XX Husqvarna AB
Huskvarna, SWEDEN
XXXXXXXXXXX
XXXXXXXXXXXX
and violent and can cause life threatening injuries. Read and understand the instructions in the manual before using the product. Refer to
Sparks from the cutting blade can cause fire in fuel, wood, clothes, dry grass or other flammable materials.
Kickback on page 16
.

Start instructions decal

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.
Noise emission to the environment complies with applicable EC Directives. The noise emission of the product is specified in
Technical data on page 33
label.
and on the
Refer to
To start the product with a cold engine on page
22
and
To start the product with a warm engine on
page 23
for instructions.

Cutting equipment decal

1. Cutting blade diameter
2. Max. speed of output shaft
3. Max. blade thickness
4. Direction of rotation
5. Bushing dimension

Type plate

Note: Other symbols/decals on the product refer to special certification requirements for some markets.
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Row 1: Brand, Model (X, Y)
Row 2: Serial No. with manufacturing date (Y, W, X): Year, Week, Sequence No.
Row 3: Product No. (X)
Row 4: Manufacturer
Row 5: Manufacturer address
5
Rows 6–7: EU type approval or Chinese MEIN number

Euro V Emissions

WARNING: Tampering with the engine voids the EU type-approval of this product.

Product liability

As referred to in the product liability laws, we are not liable for damages that our product causes if:

Safety

Safety definitions

Warnings, cautions and notes are used to point out specially important parts of the manual.
WARNING: Used if there is a risk of injury or death for the operator or bystanders if the instructions in the manual are not obeyed.
CAUTION: Used if there is a risk of damage to the product, other materials or the adjacent area if the instructions in the manual are not obeyed.
Note: Used to give more information that is necessary in a given situation.

General safety instructions

WARNING: Read the warning instructions that follow before you use the product.
• A power cutter is a dangerous tool if used carelessly or incorrectly and can cause serious injury or death. It is very important that you read and understand the contents of this operator’s manual. It is also recommended that first time operators also obtain practical instruction before using the product.
• Do not do modifications to this product. Modifications that are not approved by the manufacturer, can cause serious injury or death.
• Do not operate the product if it is possible that other persons have done modifications to the product.
• Always use original accessories and spare parts. Accessories and spare parts that are not approved by the manufacturer, can cause serious injury or death.
• Keep the product clean. Make sure that you can clearly read signs and decals.
• Never allow children or other persons not trained in the use of the product to use or service it.
• the product is incorrectly repaired.
• the product is repaired with parts that are not from the manufacturer or not approved by the manufacturer.
• the product has an accessory that is not from the manufacturer or not approved by the manufacturer.
• the product is not repaired at an approved service center or by an approved authority.
• Do not let a person operate the product unless they read and understand the contents of the operator's manual.
• Only let approved persons operate the product.
• This product produces an electromagnetic field during operation. This field can under some circumstances interfere with active or passive medical implants. To decrease the risk of serious injury or death, we recommend persons with medical implants to speak to their physician and the medical implant manufacturer before operating this product.
• The information in this operator's manual is never a substitute for professional skills and experience. If you are in a situation where you feel unsafe, stop and get expert advice. Speak to your servicing dealer. Do not try any task that you feel unsure of.

Safety instructions for operation

WARNING: Read the warning instructions that follow before you use the product.
• Before you use a power cutter, you must understand the effects of kickback and how to prevent them. Refer to
• Do the safety checks, maintenance and servicing as
Kickback on page 16
given in this operator's manual. Some maintenance and servicing must be done by an approved service center. Refer to
• Do not use the product if it is defective.
• Do not use the product if you are tired, ill, or under the influence of alcohol, drugs or medicine. These conditions can have an unwanted effect on your vision, alertness, coordination or judgment.
• Do not start the product without the belt and the belt guard installed. The clutch can become loose and cause injury.
• Sparks from the cutting blade can cause fire in flammable materials such as gasoline, gas, wood, clothes and dry grass.
• Do not cut asbestos material.
Introduction on page 24
.
.
6
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Work area safety

WARNING: Read the warning instructions that follow before you use the product.
• The safety distance for the power cutter is 15 m/50 ft. Make sure that animals and bystanders are not in the work area.
• Do not operate the product until the work area is clear and your feet and body are in a stable position.
• Look out for persons, objects and situations that can prevent safe operation of the product.
• Make sure that no persons or objects can come into contact with the cutting equipment or be hit by parts thrown by the blade.
• Do not use the product in fog, rain, strong winds, cold weather, risk of lightning or other bad weather conditions. To use the product in bad weather can have a negative effect on your alertness. Bad weather can cause dangerous work conditions, such as slippery surfaces.
• During operation of the product, make sure that no material can become loose and fall and cause injury to the operator.
• Be very careful when you operate the product on a slope.
• Keep the work area clean and bright.
• Before you operate the product, find out if there are hidden hazards such as electrical cables, water, and gas pipes and flammable substances in the work area. If the product hits a hidden object, stop the engine immediately and examine the product and the object. Do not start to operate the product again until you know that it is safe to continue.
• Before you cut into a drum, a pipe, or other container, make sure that it does not contain flammable or other material that can cause fire or explosion.

Vibration safety

WARNING: that follow before you use the product.
• During operation of the product, vibrations go from the product to the operator. Regular and frequent operation of the product can cause or increase the degree of injuries to the operator. Injuries can occur in fingers, hands, wrists, arms, shoulders, and/or nerves and blood supply or other body parts. The injuries can be debilitating and/or permanent, and can increase gradually during weeks, months or years. Possible injuries include damage to the blood circulation system, the nervous system, joints, and other body structures.
• Symptoms can occur during operation of the product or at other times. If you have symptoms and continue to operate the product, the symptoms can
Read the warning instructions
increase or become permanent. If these or other symptoms occur, get medical aid:
• Numbness, loss of feeling, tingling, pricking, pain, burning, throbbing, stiffness, clumsiness, loss of strength, changes in skin color or condition.
• Symptoms can increase in cold temperatures. Use warm clothing and keep your hands warm and dry when you operate the product in cold environments.
• Do maintenance on and operate the product as given in the operator's manual, to keep a correct vibration level.
• The product has a vibration damping system that decreases the vibrations from the handles to the operator. Let the product do the work. Do not push the product with force. Hold the product at the handles lightly, but make sure that you control the product and operate it safely. Do not push the handles into the end stops more than necessary.
• Keep your hands on the handle or handles only. Keep all other body parts away from the product.
• Stop the product immediately if strong vibrations suddenly occurs. Do not continue the operation before the cause of the increased vibrations is removed.
• To cut granite or hard concrete causes more vibration in the product than if you cut soft concrete. Cutting equipment that is blunt, defective, of incorrect type or incorrectly sharpened, increases the vibration level

Exhaust fumes safety

WARNING: that follow before you use the product.
• The exhaust fumes from the engine contain carbon monoxide which is an odourless, poisonous and very dangerous gas. To breathe carbon monoxide can cause death. Because carbon monoxide is odourless and cannot be seen, it is not possible to sense it. A symptom of carbon monoxide poisoning is dizziness, but it is possible that a person becomes unconscious without warning if the quantity or concentration of carbon monoxide is sufficient.
• Exhaust fumes also contain unburned hydrocarbons including benzene. Long-term inhalation can cause health problems.
• Exhaust fumes that you can see or smell also contain carbon monoxide.
• Do not use a combustion engine product indoors or in areas that do not have sufficient airflow.
• Do not breathe the exhaust fumes.
• Make sure that the airflow in the work area is sufficient. This is very important when you operate the product in trenches or other small work areas where exhaust fumes can easily collect.
Read the warning instructions
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7

Dust safety

WARNING: Read the warning instructions that follow before you use the product.
• Operation of the product can cause dust in the air. Dust can cause serious injury and permanent health problems. Silica dust is regulated as harmful by several authorities. These are examples of such health problems:
• The fatal lung diseases chronic bronchitis,
silicosis and pulmonary fibrosis
• Cancer
• Birth defects
• Skin inflammation
• Use correct equipment to decrease the quantity of dust and fumes in the air and to decrease dust on work equipment, surfaces, clothing and body parts. Examples of controls are dust collection systems and water sprays to bind dust. Decrease dust at the source where possible. Make sure that the equipment is correctly installed and used and that regular maintenance is done.
• Use approved respiratory protection. Make sure that the respiratory protection is applicable for the dangerous materials in the work area.
• Make sure that the airflow is sufficient in the work area.
• If it is possible, point the exhaust of the product where it cannot cause dust to go into the air.

Personal protective equipment

WARNING: that follow before you use the product.
• Always use approved personal protective equipment during operation. Personal protective equipment cannot eliminate the risk of injury but it will reduce the degree of injury if an accident does happen. Ask your servicing dealer for help in choosing the right equipment.
• Use an approved protective helmet.
• Use approved hearing protection. Long-term exposure to noise can result in permanent hearing impairment. Be aware of warning signals or shouts when you are wearing hearing protection. Always remove your hearing protection as soon as the engine stops.
• Use approved eye protection to decrease the risk of injury from thrown objects. If you use a face shield then you must also wear approved protective goggles. Approved protective goggles must comply with standard ANSI Z87.1 in the USA or EN 166 in EU countries. Visors must comply with standard EN
1731.
• Use heavy duty gloves.
Read the warning instructions
• Use approved respiratory protection. The use of products such as cutters, grinders, drills, that sand or form material can generate dust and vapours which may contain hazardous chemicals. Check the nature of the material you intend to process and use appropriate breathing mask.
• Use tight-fitting, heavy-duty and comfortable clothing that permits full freedom of movement. Cutting generates sparks that can ignite clothing. Husqvarna recommends that you wear flame-retardant cotton or heavy denim. Do not wear clothing made of material such as nylon, polyester or rayon. If ignited such material can melt and cling to the skin. Do not wear shorts.
• Use boots with steel toe-cap and non-slip sole.
• Always keep a first aid kit near.
• Sparks can come from the muffler or the cutting blade. Always have a fire extinguishing available.

Safety devices on the product

WARNING: that follow before you use the product.
• Do not use a product with defective safety devices.
• Do a check of the safety devices regularly. If the safety devices are defective, speak to your Husqvarna approved service agent.
• Do not change the safety devices.
• Do not use the product if protective plates, protective covers, safety switches or other protective devices are defective or not attached.
Throttle trigger lockout
The throttle trigger lockout prevents accidental operation of the throttle trigger. If you put your hand around the handle and push the throttle trigger lockout (A), it releases the throttle trigger (B). If you release the handle, the throttle trigger and the throttle trigger lockout
Read the warning instructions
8
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move back to their initial positions. This function locks
A
B
A
B
C
the throttle trigger at idle speed.
To do a check of the throttle trigger lockout
1. Make sure that the throttle trigger is locked at the idle position when the throttle trigger lockout is released.
2. Push the throttle trigger lockout and make sure that it goes back when you release it.
6. If the cutting blade rotates at idle position, adjust the idle speed. Refer to
29
.
To do a check of the stop switch
1. Start the engine. Refer to
To adjust the idle speed on page
To start the product with a
cold engine on page 22
2. Push the stop switch to the STOP position. The engine must stop.
Blade guard and SmartGuard (Optional)
WARNING: Make sure that the blade guard and SmartGuard are correctly attached before you start the product. Do not use the product if the blade guard or SmartGuard is missing, defective or has cracks.
The blade guard (A) and SmartGuard (B) are installed above the cutting blade (C). They prevent injury if pieces of the blade or cut material are thrown in the direction of the operator.
3. Make sure that the throttle trigger and throttle trigger lockout move freely and that the return springs operate correctly.
The SmartGuard is spring loaded and must always move freely and retract to its initial position by spring force.
4. Start the product and apply full throttle.
5. Release the throttle control and make sure that the cutting blade stops and stays stationary.
1447 - 001 - 16.04.2020 9
To examine the blade and the blade guard
WARNING: A damaged cutting blade can cause injury.
1. Make sure that the cutting blade is attached correctly and does not show signs of damage.
2. Make sure that the blade guard has no cracks or is damaged.
3. Replace the blade guard if it is damaged.
To do a check of the SmartGuard
WARNING: A damaged SmartGuard can cause injury.
1. Make sure that the SmartGuard has no cracks or is not damaged.
2. Make sure that the SmartGuard moves freely and retracts by spring force.
3. Clean or replace the SmartGuard if it does not retract immediately when pushed in, or is damaged.
Vibration damping system
Your product is equipped with a vibration damping system that is designed to minimize vibration and make operation easier. The product′s vibration damping system reduces the transfer of vibration between the engine unit/cutting equipment and the product′s handle unit.
To do a check of the vibration damping system
2. Make sure that the vibration damping units are correctly attached to the engine unit and handle unit.
Muffler
The muffler keeps the noise levels to a minimum and sends the exhaust fumes away from the operator.
Do not use the product if the muffler is missing or defective. A defective muffler increases the noise level and the risk of fire.
WARNING: The muffler becomes very hot during and after use and when the engine operates at idle speed. Be careful near flammable materials and/or fumes to prevent fire.
To do a check of the muffler
• Examine the muffler regularly to make sure that it is attached correctly and not damaged.

Fuel safety

WARNING: Read the warning instructions that follow before you use the product.
• Fuel is flammable and the fumes are explosive. Be careful with fuel to prevent injury, fire and explosion.
• Only refuel the product outdoors, where the airflow is sufficient. Do not breathe in the fuel fumes. The fuel fumes are poisonous and can cause injury, fire and explosion.
• Do not remove the fuel tank cap or fill the fuel tank when the engine is on.
• Let the engine become cool before you refuel.
• Do not smoke near the fuel or the engine.
• Do not put hot objects near the fuel or the engine.
• Do not fill fuel near sparks or flames.
• Before you refuel, open the fuel tank cap slowly and release the pressure carefully.
• Fuel on your skin can cause injury. If you get fuel on your skin, use soap and water to remove the fuel.
• If you spill fuel on your clothing, change clothing immediately.
• Tighten the fuel tank cap fully. If the fuel tank cap is not correctly tightened, the vibrations in the product can loosen it and cause leakage of fuel and fuel fumes. Fuel and fuel fumes are a risk of fire.
WARNING: Make sure that the engine is off and that the stop switch is in STOP position.
1. Make sure that there are no cracks or deformation on the vibration damping units. Replace the vibration damping units if they are damaged.
10
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• Before you start the product, move the product to a
Min
minimum of 3 m/10 ft from where you refueled.
• Do not start the product if there is fuel or oil spilled on the product. Remove the unwanted fuel and oil and let the product dry before you start the engine.
• Examine the engine for leaks regularly. If there are leaks in the fuel system, do not start the engine until the leaks are repaired.
• Keep fuel in approved containers only.
• When the product and fuel is in storage, make sure that fuel and fuel fumes cannot cause damage, fire and explosion.
• Drain the fuel in an approved container outdoors and away from sparks and flames.

Assembly

Safety instructions for maintenance

WARNING: Read the warning instructions that follow before you use the product.
• Make sure that the engine is off and that the stop switch is in STOP position.
• Use personal protective equipment. Refer to
Personal protective equipment on page 8
• If the maintenance is not done correctly and regularly, the risk of injury and damage to the product increases.
• Only do the maintenance as given in this operator's manual. Let an approved service center do all other servicing.
• Let an approved Husqvarna service agent do servicing on the product regularly.
• Replace damaged, worn or broken parts.
• Always use original accessories.
.

Cutting blades

WARNING: Always use protective gloves when you assemble the product.
WARNING: A cutting blade can break and cause injury to the operator.
WARNING: Examine the cutting blade for cracks, lost segments distortion or unbalance prior to use and immediately after striking an unintended object. Do not use a damaged cutting blade. After inspecting and installing the cutting blade, position yourself and bystanders away from the plane of the rotating cutting blade and run the power tool at maximum no load speed for one minute.
WARNING: The cutting blade manufacturer gives warnings and recommendations for the operation and correct maintenance of the cutting blade. Those warnings are supplied with the cutting blade. Read and obey the instructions that are supplied with the cutting blade.

Applicable cutting blades

WARNING: Only use diamond blades and abrasive blades for concrete and metal. Do not use blades with serrations such as circular wood cutting blades or blades with carbide tips. The risk of kickback is increased and carbide tips can come off and be thrown at high speed. This can result in injury or death.
WARNING: Never use a cutting blade for any other materials than what it was intended to cut.
WARNING: Use only cutting blades that comply with applicable national or regional standards, for example EN12413, EN13236 or ANSI B7.1.
WARNING: Do not use a cutting blade with a rated speed value lower than that of the product. The rated speed value of the cutting blade is marked on the cutting blade, and that of the product is marked on the blade guard.
1447 - 001 - 16.04.2020 11
100 m/s
XXXX rpm
Note: Many cutting blades that can be attached to this
xxxx
product are made for stationary saws. The rated speed value of those cutting blades is too low for this product.
CAUTION: Do not use cutting blades with thickness exceeding maximum recommended thickness. Refer to
data on page 33
• Cutting blades applicable to this product are available in two basic models; bonded abrasive blades and diamond blades.
.
Technical
A bonded abrasive cutting blade is made of small abrasive grains joined with an organic or vitrified bond, molded with fabric reinforcements, which prevents the cutting blade from breaking during high speed operation.

Bonded abrasive cutting blades for different materials

Note: Make sure that you use the correct cutting blades for rail cutting.
Blade type Material
Concrete blade
Metal blade Steel, alloy steel and other hard met-
Cutting blade for rail cutting
Concrete, asphalt, stone masonry, cast iron, aluminum, copper, brass, cables, rubber and plastic.
al.
Rail

To examine a bonded abrasive cutting blade

• Make sure that there are no cracks or damages on the cutting blade.
• Make sure that the cutting blade has the correct center hole dimension for the installed arbor bushing.

Cutting blade vibration

CAUTION: much force, the cutting blade can become too hot, bend and cause vibrations. Use the product with less force. If the vibrations continue, replace the cutting blade.
If you use the product with too

Bonded abrasive cutting blades

WARNING: cutting blades together with water. Moisture decreases the strength in the bonded abrasive cutting blade and the cutting blade can break and cause injury.
12
Do not use bonded abrasive
• Hang the cutting blade on your finger and hit the cutting blade lightly with a screwdriver. If you do not hear a clear sound, the cutting blade is damaged.
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Diamond blades

T2
A
B
WARNING: Diamond blades become very hot when used. A diamond blade that is too hot gives bad performance, blade damage and is a safety risk.
WARNING: Do not use diamond blades to cut plastic material. The hot diamond blade can melt the plastic, which can cause a kickback.
• Diamond blades have a steel core with segments that are made of industrial diamonds.
• Diamond blades are used for masonry, reinforced concrete and stone.
• Make sure that the diamond blade rotates in the direction of the arrows shown on the diamond blade.
• Always use a sharp diamond blade.
• Diamond blades can become blunt if you use an incorrect feeding pressure or when you cut materials such as hard reinforced concrete. If you use a blunt diamond blade it becomes too hot, which can cause the diamond segments to come loose.

To sharpen the cutting blade

For the best cutting results, use a sharp cutting
Note: blade.
• To sharpen the cutting blade, cut into soft material, such as sandstone or brick.

Diamond blades for wet cutting

• Diamond blades for wet cutting must be used with water.
• Water decreases the temperature of the cutting blade, increases its service life and decreases dust during operation.
• When wet cutting, collect the waste water safely.

Diamond blades for dry cutting

• For diamond blades for dry cutting it is necessary to have a sufficient airflow around the cutting blade to decrease the temperature. Because of this, diamond blades for dry cutting are recommended only for intermittent operation. After some seconds of operation, it is necessary to let the diamond blade rotate freely, away from the cut. This lets the airflow
around the blade decrease the temperature of the diamond blade.

Diamond blade - side clearance

WARNING: Certain cutting situations or poor blades can suffer excessive wear on the side of the segments. Make sure the diamond segment (A) is wider than the blade (B). This is to prevent pinching in the cutting slot and kickback. Refer to
on page 16
CAUTION: Some cutting situations and worn blades may cause increased wear on the side of the segments. Replace the blade before it is worn out.
.

Toothed blades

WARNING: as wood cutting blades, circular toothed blades, carbide tipped blades, etc. The risk of kickback is significantly increased and tips can be torn off and thrown at high speed. Carelessness can result in serious personal injury or even death.
WARNING: Government regulation requires a different type of guarding for carbide tipped blades not available on power cutters – a 360 degree guard. Power Cutters (this saw) use diamond blades and have a different guarding system which does not provide protection against the dangers presented by wood cutting blades.
Never use toothed blades such
Kickback
1447 - 001 - 16.04.2020 13
Use of this power cutter with a carbide tipped blade is a violation of work safety regulations.
Due to the hazardous nature and exigent circumstances involved with fire fighting and rescue operations conducted by the various highly trained public safety forces, safety professionals (fire departments), Husqvarna is aware that they may use this power cutter with carbide tipped blades in certain emergency situations due to the ability of carbide tipped blades to cut many different types of obstructions and materials in combination without having to take time to switch blades or machines. When using this power cutter be aware at all times that carbide tipped blades are more kickback prone than diamond blades if not used properly. Carbide tipped blades can also throw pieces of material away from the blade.
For these reasons, a power cutter equipped with a carbide tipped blade should never be used except by highly trained public safety professionals who are aware of the risks associated with its use and then only in those exigent circumstances when other tools are deemed inefficient and ineffective for fire or rescue operations. A power cutter equipped with a carbide tipped blade should never be used to cut wood in non­rescue operations.

To examine the spindle shaft and the flange washers

CAUTION: Use only Husqvarna flange washers with a minimum diameter of 105 mm/4.1 in.
2. Make sure that the areas of contact on the cutting blade and the flange washers are not damaged. Replace damaged parts.
3. Make sure that the flange washers are clean and of the correct dimension.
4. Make sure that the flange washers move freely on the spindle shaft.

To do a check of the arbor bushing

The arbor bushings are used to attach the product to the center hole of the cutting blade. The product is supplied with one of these two types of arbor bushings:
• An arbor bushing that can be turned to the other side and be applicable for 20 mm/0.79 in. or 25.4 mm/1 in. center holes.
• A 25.4 mm/1 in. arbor bushing.
• A decal on the blade guard shows installed arbor bushing and specification for applicable cutting blades.
WARNING: Do not use defective, worn or dirty flange washers. Use only flange washers of the same dimension. Incorrect flange washers can cause the cutting blade to become damaged or come loose.
Examine the spindle shaft and the flange washers when you replace the cutting blade.
1. Make sure that the threads on the spindle shaft are not damaged. Replace damaged parts.
14
• Make sure that the dimension of the center hole of the cutting blade agrees with the installed arbor bushing. The diameter of the center hole is printed on the cutting blade.
• Use only Husqvarna arbor bushings.

To examine the direction of rotation of the cutting blade

1. Find the arrows on the cutting arm that show the direction of rotation of the spindle shaft.
2. Find the arrow on the cutting blade that shows the direction of rotation of the cutting blade.
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3. Make sure that the direction arrows of the cutting
A
B
C
blade and the spindle shaft have the same direction.

To install the cutting blade

WARNING: Make sure that the engine is off and that the stop switch is in the STOP position.
WARNING: Always use protective gloves when you assemble the product.
4. Put a tool into the hole in the cutting head and turn the cutting blade until the shaft is locked.
1. Examine the flange washers and the spindle shaft. Refer to
To examine the spindle shaft and the flange
washers on page 14
2. Push back and hold the SmartGuard in the retracted position.
Note: This step only applies to K 770 SmartGuard.
3. Put the cutting blade on the arbor bushing (A) between the inner flange washer (B) and the flange washer (C). Turn the flange washer until it holds on to the shaft.
.
5. Tighten the cutting blade bolt to 30 Nm/18.5 ft-lb.

To reverse the cutting head (K 770, K 770 OilGuard, K 770 Rescue)

WARNING: Only cut with the cutting head reversed if a standard procedure is not possible.
The product has a reversible cutting head that lets you cut near a wall or at ground level. Only cut with the cutting head reversed if a standard procedure is not possible. If a kickback occurs, it is more difficult to control the product if the cutting head is reversed. The distance between the cutting blade and the center of the product is longer, which means that the handle and the cutting blade do not align. This has a negative effect on the balance in the product and it is more difficult to hold the product if the cutting blade is pinched or stalled in the kickback zone. Refer to
WARNING: and that the stop switch is in the STOP position.
Kickback on page 16
Make sure that the engine is off
.
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WARNING: Always use protective gloves when you assemble the product.
1. Remove the cutting blade, the front belt cover and the cutting head. Refer to steps 1-5 in
drive belt on page 26
.
To replace the
15
2. Remove the 2 screws and nuts that hold the spray nozzle.
5. Remove the stop sleeve.
3. Remove the 2 screws from the adjustment handle for the blade guard.
4. Remove the adjustment handle for the blade guard

Operation

Introduction

6. Move the bearing housing and install the stop sleeve.
7. Install the stop sleeve.
8. Install the drive belt on the opposite side.
9. Install the cutting head and the drive belt cover, refer to
To replace the drive belt on page 26
10. Install the spray nozzle and the cutting blade in the opposite sequence to how they were removed.
kickback and how to avoid it before using the product.
.
WARNING: Read and understand the safety chapter before you use the product.

Kickback

WARNING: Kickbacks are sudden and can be very violent. The power cutter can be thrown up and back towards the user in a rotating motion causing serious or even fatal injury. It is vital to understand what causes
16 1447 - 001 - 16.04.2020
Kickback is the sudden upward motion that can occur if the blade is pinched or stalled in the kickback zone. Most kickbacks are small and pose little danger. However a kickback can also be very violent and throw the power cutter up and back towards the user in a rotating motion causing serious or even fatal injury.

Reactive force

A reactive force is always present when cutting. The force pulls the product in the opposite direction to the blade rotation. Most of the time this force is insignificant.
If the blade is pinched or stalled, the reactive force will be strong and you might not be able to control the power cutter.
Never move the product when the cutting equipment is rotating. Gyroscopic forces can obstruct the intended movement

Kickback zone

Never use the kickback zone of the blade for cutting. If the blade is pinched or stalled in the kickback zone, the reactive force will push the power cutter up and back towards the user in a rotating motion causing serious or even fatal injury.

Climbing kickback

If the kickback zone is used for cutting, the reactive force drives the blade to climb up in the cut. Do not use the kickback zone. Use the lower quadrant of the blade to avoid climbing kickback.

Pinching kickback

Pinching is when the cut closes and pinches the blade. If the blade is pinched or stalled the reactive force will be strong and you might not be able to control the power cutter.

Rotational kickback

A rotational kickback occurs when the cutting blade does not move freely in the kickback zone.
If the blade is pinched or stalled in the kickback zone, the reactive force will push the power cutter up and back towards the user in a rotating motion causing serious or even fatal injury. Be alert for potential movement of the work piece. If the work piece is not properly supported and shifts as you cut, it might pinch the blade and cause a kick back.

To cut in pipes

WARNING: kickback zone it will cause a severe kickback.
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If the blade is pinched in the
Special care should be taken when cutting in pipes. If
I
III II
the pipe is not properly supported and the cut kept open through out the cutting, the blade might be pinched. Be especially alert when cutting a pipe with a belled end or a pipe in a trench that, if not properly supported, may sag and pinch the blade.
If the pipe is allowed to sag and close the cut, the blade will be pinched in the kick back zone and a severe kick back might develop. If the pipe is properly supported the end of the pipe will move downward, the cut will open and no pinching will occur.
1. Secure the pipe so it does not move or roll during cutting.
2. Cut section "I" of the pipe.
power cutter and make sure that the blade is never pinched in the kickback zone.
WARNING: Be careful when you put the blade in an existing cut.
WARNING: Make sure that the work piece cannot move during a cutting operation.
WARNING: Only you and proper working technique can eliminate kickback and its dangers.
• Always support the work of piece so that the cut can keep open when cutting through. When the cut is open there is no kickback. If the cut is closed and pinches the blade, there is a risk of kickback.

Basic working techniques

WARNING: side. This can prevent the free movement of the cutting blade. The cutting blade can break and cause injury to the operator or bystanders.
Do not pull the product to one
3. Ensure that the cut opens to avoid pinching.
4. Move to side II and cut from section I to bottom of the pipe.
5. Move to side III and cut the remaining part of the pipe ending at the bottom.

To prevent a kickback

WARNING: Avoid situations where there is a risk of kickback. Take care when using your
WARNING: Do not grind with the side of the cutting blade. The cutting blade can break and cause injury to the operator or bystanders. Only use the cutting edge.
WARNING: Make sure that the cutting blade is installed correctly and does not show signs of damage.
WARNING: Before cutting in an existing cut made by a different blade, make a sure that the slot is not thinner than your blade as that can result in binding in the cutting slot and a kickback.
WARNING: Cutting metal generates sparks that can cause fire. Do not use the product near flammable material or gases.
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• The product is made to cut with bonded abrasive cutting blades or diamond blades made for high speed handheld product. The product must not be used with other types of blade, or for other types of operation.
• Do a check that the correct cutting blade is used for the material to be cut. Refer to
blades on page 11
• Do not cut asbestos materials.
• Keep a safe distance from the cutting blade when the engine is on. Do not try to stop a rotating blade with a part of your body. To touch a rotating blade, although the engine is off, can result in serious injury or death.
• The cutting blade continues to rotate for a while after the throttle trigger is released. Make sure that the cutting blade has stopped before the product is moved or put down. If it is necessary to stop the cutting blade quickly, let the cutting blade lightly touch a hard surface.
• Do not move the product with the engine on.
• Hold the product with 2 hands. Hold the product tightly with thumbs and fingers fully around the plastic handles with insulation. The right hand must be on the rear handle and the left hand on the front handle. All operators must use this hold. Do not operate a power cutter with only 1 hand.
for instructions.
Applicable cutting
are then collected up by the guard and led away from the operator. The guards for the cutting equipment must always be installed when the product is on.
• Do not use the kickback zone of the blade for cutting. Refer to instructions.
• Do not operate the product before the work area is clear and your feet and body are in a stable position.
• Do not cut above shoulder height.
• Do not cut from a ladder. Use a platform or scaffold if the cut is above shoulder height. Do not overreach.
Kickback zone on page 17
for
• Stand parallel to the cutting blade. Avoid standing straight behind. If a kickback occur, the saw will move in the plane of the cutting blade.
• Do not go away from the product with the engine on. Before you go away from the product, stop the engine and make sure that there is no risk of accidental start.
• Use the adjustment handle of the blade guard to adjust the rear section of the guard flush with the work piece. Spatter and sparks from the cut material
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• Stay at a comfortable distance from the work piece.
• Make sure that the cutting blade can move freely when the engine is started.
• Apply the cutting blade carefully with high rotating speed (full throttle). Keep full speed until cutting is complete.
• Let the product do the work. Do not push the cutting blade.
19
• Feed the product down in line with the blade. Pressure from the side can cause damage to the blade and is very dangerous.
• Move the blade slowly forward and rearward to get a small contact area between the blade and the material to be cut. This decreases the temperature of the blade and is an effective way to cut.

Basic working techniques with K 770 SmartGuard

WARNING: disengaged if the SmartGuard is manually retracted. Only retract the SmartGuard manually if you must and there are no risks of kickback.
SmartGuard gives more coverage of the blade. This decreases the risk that you touch the blade if a kickback occurs.
• You can retract the SmartGuard manually with the SmartGuard handle.
• Hold the SmartGuard handle with a left hand finger while the remaining fingers hold the front handle at the same time.
The SmartGuard function is

To decrease dust during operation

The product has a wet cutting kit to decrease harmful dust in the air during operation. The wet cutting kit has low water consumption.
• When possible, use wet cutting blades with water cooling. Refer to
• Adjust the water flow with the valve. The correct flow is different for different types of tasks.
• Make sure that the water pressure is correct. Refer to
Technical data on page 33
comes off at the supply source, the supplied water pressure can be too high.
Cutting blades on page 11
. If the water hose
.

Fuel

This product has a two-stroke engine.
CAUTION: Incorrect type of fuel can result in engine damage. Use a mixture of gasoline and two-stroke oil.

Two-stroke oil

• For best results and performance use Husqvarna two-stroke oil.
• If Husqvarna two-stroke oil is not available, use a two-stroke oil of good quality for air-cooled engines. Speak to your servicing dealer to select the correct oil.
CAUTION: water-cooled outboard engines, also referred to as outboard oil. Do not use oil for four-stroke engines.

Premixed fuel

• Use Husqvarna premixed alkylate fuel for best performance and extension of the engine life. This fuel contains less harmful chemicals compared to regular fuel, which decreases harmful exhaust fumes. The quantity of remains after combustion is
Do not use two-stroke oil for
20
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lower with this fuel, which keeps the components of
A
B
C
the engine more clean.

To mix gasoline and two-stroke oil

Gasoline, liter Two-stroke oil,
liter
2% (50:1)
5 0.10
10 0.20
15 0.30
20 0.40
US gallon US fl. oz.
1 2 ½
2 1/2 6 ½
5 12 ⅞
CAUTION: Small errors can influence the ratio of the mixture drastically when you mix small quantities of fuel. Measure the quantity of oil carefully and make sure that you get the correct mixture.

OilGuard

Note: Applicable only to K 770 installed with OilGuard (optional) and filled with a mixture of gasoline and Husqvarna two-stroke oil.
• OilGuard is a built-in system that senses an incorrect fuel mixture.
• When the product operates, a detector reads the fuel mixture during 10 seconds. If the correct mixture is used, the product operates at the correct speed. If the incorrect mixture is used, the product decreases the engine speed to 3800 rpm to prevent engine failure.
• To make the product operate at the correct speed, drain the incorrect fuel mixture. See
and two-stroke oil on page 21
the correct fuel mixture.
To mix gasoline
. Fill the product with

OilGuard oil

Use Husqvarna OilGuard oil when you use the OilGuard system. OilGuard oil has a special color that is necessary for the OilGuard system to work correctly.

To disengage the OilGuard

Note: A broken indicator pin shows that the OilGuard system is disengaged. You cannot use a broken indicator pin again to engage the OilGuard system.
The OilGuard plug (A) and a blue indicator pin (B) are factory installed in the tank. The OilGuard lid (C) comes as a spare part. If you do not have access to the OilGuard oil, disengage the OilGuard system.
1. Fill half the quantity of gasoline in a clean container for fuel.
2. Add the full quantity of oil.
3. Shake the fuel mixture.
4. Add the remaining quantity of gasoline to the container.
5. Carefully shake the fuel mixture.
CAUTION: Do not mix fuel for more than 1 month at a time.
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1. Remove the OilGuard plug (A) with a screwdriver.
2. Remove the blue indicator pin (B).
3. Install the OilGuard lid (C) in the tank.

To engage the OilGuard system

You cannot use a broken indicator pin to engage
Note: the OilGuard system again. You can get a new indicator pin as a spare part. The spare part of the indicator pin is grey to show that the OilGuard system has been disengaged after the product left the factory.
1. Remove the OilGuard lid from the tank. Refer to
disengage the OilGuard on page 21
2. Attach a grey indicator pin to the OilGuard plug.
To
21
3. Install the OilGuard plug in the tank.

To fill fuel

CAUTION: Do not use gasoline with an octane number less than 90 RON (87 AKI). It causes damage to the product.
CAUTION: Do not use gasoline with more than 10% ethanol concentration (E10). It causes damage to the product.
Note: Carburetor adjustment is in some conditions necessary when you change the type of fuel.
• Use gasoline with a higher octane number if you frequently use the product at continuously high engine speed.
1. Open the fuel tank cap slowly to release the pressure.
2. Fill slowly with a fuel can. If you spill fuel, remove it with a cloth and let the remaining fuel dry off.
3. Clean the area around the fuel tank cap.
4. Tighten the fuel tank cap fully. If the fuel tank cap is not tightened, there is a risk of fire.
5. Move the product a minimum of 3 m (10 ft) from the position where you filled the tank before a start.

To start the product with a cold engine

WARNING: can rotate freely. It starts to rotate when the engine starts.
Make sure that the cutting blade
2. Pull the choke control fully to get the start throttle position.
3. Push the decompression valve to decrease the pressure in the cylinder. The decompression valve goes back to its initial position when the product starts.
4. Push the air purge bulb 6 times until it is fully filled with fuel.
1. Make sure that the STOP switch is in the left position.
5. Hold the front handle with your left hand.
6. Put your right foot on the lower section of the rear handle to push the product against the ground.
WARNING: around your hand.
22 1447 - 001 - 16.04.2020
Do not wind the starter rope
7. Pull the starter rope slowly with your right hand until you feel a resistance as the starter pawls engage. Then pull continuously and quickly.

To start the product with a warm engine

WARNING: Make sure that the cutting blade can rotate freely. It starts to rotate when the engine starts.
1. Make sure that the STOP switch is in the left position.
CAUTION: Do not pull the starter rope fully and do not let go of the starter rope handle when the starter rope is extended. This can cause damage to the product.
8. Push the choke control when the engine starts. If the choke is pulled out, the engine will stop after some seconds. If the engine stops, pull the starter rope handle again.
9. Push the throttle trigger to disengage the start throttle and set the product at idle speed.
2. Pull the choke control fully to get the start throttle position.
3. Push the decompression valve to decrease the pressure in the cylinder. The decompression valve goes back to its initial position when the product starts.
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23
4. Push the choke control to disable the choke. The start throttle stays in position.
5. Hold the front handle with your left hand.
6. Put your right foot on the lower section of the rear handle to push the product against the ground.
WARNING: Do not wind the starter rope around your hand.
7. Pull the starter rope slowly until you feel a resistance as the starter pawls engage. Then pull continuously and quickly.
handle when the starter rope is extended. This can cause damage to the product.
8. Push the throttle trigger to disengage the start throttle and set the product at idle speed.

To stop the product

WARNING: The cutting blade continues to rotate for a while after the engine stops. Make sure that the cutting blade can rotate freely until it fully stops. If it is necessary to stop the cutting blade quickly, let the cutting blade lightly touch a hard surface. Risk of serious injury.
• Move the STOP switch to the right to stop the engine.
CAUTION: Do not pull the starter rope fully and do not let go of the starter rope

Maintenance

Introduction

WARNING: Read and understand the safety chapter before you do maintenance on the product.
For all servicing and repair work on the product, special training is necessary. We guarantee that professional repairs and servicing is available. If your dealer is not a
24 1447 - 001 - 16.04.2020
service agent, speak to them for information about the nearest service agent.
For spare parts, speak to your Husqvarna dealer or service agent.

Maintenance schedule

The maintenance schedule shows the necessary maintenance of the product. The intervals are calculated on daily use of the product.
Daily Weekly Monthly Yearly
Clean External cleaning Spark plug
Cold air intake Fuel tank
General inspection Vibration damping system* Fuel system
Fuel leaks Muffler* Air filter
Water delivery system Drive belt Clutch
Function inspection
Replace Fuel filter
* Refer to
Safety devices on the product on page 8
Throttle lockout* Carburetor
Stop switch* Starter housing
Blade guard and SmartGuard*
Cutting blade**
.
** Refer to
Cutting blades on page 11
.

To clean externally

• Flush the product externally with clean water after each day of operation. If it is necessary, use a brush.

To clean the air intake

CAUTION: A dirty or blocked air intake makes the product too hot. This can cause damage to the piston and cylinder.
• Clean the air intake if it is necessary.
• Remove blockage, dirt and dust with a brush.

To do a check of the spark plug

CAUTION: Always use the recommended spark plug type. Use of the incorrect spark plug can cause damage to the piston and cylinder. For recommended spark plug refer to
Technical data on page 33
Examine the spark plug if the product is low on power, does not start easily or if it operates unsatisfactorily at idle speed.
.
1. Loosen the 3 screws on the air filter cover and remove the air filter cover.
2. Make sure that the spark plug cap and ignition cable are not damaged.
WARNING: A damaged spark plug cap and ignition cable can cause electrical shock.
3. Clean the spark plug if it is dirty.
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25
4. Disconnect the spark plug cap and remove the spark
0.5 mm
A
B
plug.
5. Make sure that the electrode gap is 0.5 mm.
3. Remove the 2 screws on the rear belt guard. Remove the rear belt guard.
4. Replace the drive belt. Turn the belt tensioner to the position 1.
6. If it is necessary, replace the spark plug.

To do a general inspection

• Make sure that all nuts and screws on the product are tightened correctly.

To replace the drive belt

WARNING: Do not start the product without all guards and covers installed.
1. Loosen the 3 nuts on the cutting head (A) and turn the belt tensioner (B) to the position 0.
2. Remove the front belt guard.
26
5. Install the 2 belt guards in opposite sequence.
6. Adjust the tension on the drive belt. Refer to
adjust the tension of the drive belt on page 26
To
.

To adjust the tension of the drive belt

Note: Adjust the tension of a new drive belt after you use 1 or 2 fuel tanks.
1. Loosen the 3 nuts.
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2. Move the blade guard (A) up and down 3–5 times.
A
B
A
B
C
Tighten the 3 nuts (B).

To replace a damaged starter rope

1. Pull out the starter rope approximately 30 cm.

Starter housing

WARNING: Always be careful and always use eye protection when you replace the recoil spring or the starter rope. There is tension in the recoil spring when it is wound in the starter housing. The recoil spring can eject and cause injury.

To remove the starter housing

1. Loosen the 4 screws on the starter housing.
2. Remove the starter housing.
2. Hold the starter rope pulley (A) with your thumb.
3. Put the starter rope in the notch (B) in the starter pulley .
4. Put the starter rope around the metal sleeve (C).
5. Let the starter pulley rotate slowly and the starter rope wind up on the metal sleeve.
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6. Remove the starter rope from the metal sleeve.
27
7. Remove the cover on the starter rope handle (A).
B
A
C
A
A
B
A
B
C
A
B
8. Pull the starter rope up through the handle (B).
9. Release the knot (C).
10. Remove the starter rope.
11. Make sure that the recoil spring is clean and not damaged.
12. Put a new starter rope (A) in the hole in the starter housing.

To adjust the tension of the recoil spring

1. Pull out the starter rope.
2. Hold the starter rope pulley (A) with your thumb.
3. Put the starter rope in the notch (B) and wind it up around the metal sleeve (C).
4. Pull out the starter rope (A).
13. Pull the starter rope through the starter rope handle and make a knot at the end of the starter rope (A).
14. Attach the cover on the starter rope handle (B).
15. Adjust the tension of the recoil spring. Refer to
adjust the tension of the recoil spring on page 28
28
5. Put your thumb on the starter pulley (B) to keep the starter rope pulled out.
To
.
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6. Release the starter rope from the notch.
B
A
7. Remove your thumb to release the starter pulley (A) and let the starter rope (B) wind up on the pulley.
8. Pull out the starter rope fully to do a check that the recoil spring is not at its end position. Make sure that the starter pulley can be turned half a turn or more before the recoil spring stops the movements.

To remove the spring assembly

WARNING: you remove the spring assembly. There is a risk for eye injury, especially if a spring is broken.
1. Remove the 2 screws on the spring assembly.
2. Push the 2 brackets on the snap locks with a screwdriver.
Always use eye protection when

To clean the spring assembly

CAUTION: Do not remove the spring from the assembly.
1. Blow the spring with compressed air until it is clean.
2. Apply a light oil to the spring.

To attach the spring assembly

• Assemble in the opposite sequence of
the spring assembly on page 29
To remove
.

To install the starter housing

CAUTION: The starter pawls must come into the correct position against the starter pulley sleeve.
1. Put the starter housing against the product.
2. Pull out and release the starter rope slowly until the starter pulley engages with the starter pawls.
3. Tighten the 4 screws on the starter housing.

To examine the carburetor

Note: The carburetor has rigid needles to make sure that the product always receives the correct mixture of fuel and air.
1. Examine the air filter. Refer to
the air filter on page 30
2. If it is necessary, replace the air filter.
3. If the engine continues to decrease in power or speed, speak to your Husqvarna servicing dealer.
To do the servicing of

To examine the fuel system

1. Make sure that the fuel tank cap and its seal are not damaged.
2. Examine the fuel hose. Replace the fuel hose if it is damaged.

To adjust the idle speed

WARNING: speed, speak to your servicing dealer. Do not use the product until the idle speed is correctly adjusted or repaired.
Note: For recommended idle speed refer to
data on page 33
1. Start the engine.
If the cutting blade rotates at idle
Technical
.
1447 - 001 - 16.04.2020
29
2. Examine the idle speed. When the carburetor is
A
B
A B
T
correctly adjusted, the cutting blade stops when the engine is at idle speed.
3. Use the T screw to adjust the idle speed.
a) Turn the screw clockwise until the blade starts to
rotate (A).
b) Turn the screw counterclockwise until the blade
stops to rotate (B).

Fuel filter

The fuel filter is installed in the fuel tank. The fuel filter prevents contamination of the fuel tank when the fuel tank is filled. The fuel filter must be replaced yearly or more frequently if it is clogged.
CAUTION: Do not clean the fuel filter.
1. Loosen the 3 screws on the air filter cover.
2. Remove the air filter cover.
3. Examine the air filter. Do step 6 and 7 if the filter is not damaged.
4. Replace a damaged air filter. a) Remove the air filter.

To do the servicing of the air filter

CAUTION: air filter. Particles that fall into the carburetor inlet can cause damage.
CAUTION: Do not clean the air filter. The air filter is made of paper and is easily damaged.
WARNING: Use approved respiratory protection when you replace the air filter. The dust in the air filter is dangerous to your health. Discard used air filters correctly.
Note: Replace the air filter only when it is damaged.
Examine the air filter if the engine power decreases.
30
Be careful when you remove the
b) Install the new air filter.
5. Put back the air filter cover in its location.
6. Tighten the 3 screws.

To do a check of the water supply system

1. Examine the nozzles on the blade guard and make sure that they are not clogged.
2. Clean as necessary.
3. Examine the filter on the water connector. Make sure that it is not clogged.
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