Husqvarna K 770 VAC Power Cutter Saw 967860701, 12" Gas Engine

Safety Information

Husqvarna K 770 Vac Power Cutter Saw

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 machine
• Under no circumstances may the design of the product be modified without the permission of the manufacturer. Do not use a product that appears to have been modified by others and always use original accessories. Non-authorized modifications and/or accessories can result in serious personal injury or the death of the operator or others.
• Keep the product clean. Signs and decals must be fully visible.
• Never allow children or other persons not trained in the use of the product to use or service it.
• Do not let a person use the product unless you make sure that they understand the contents of the manual.
• Long term inhalation of the engine’s exhaust fumes can represent a health risk. When the engine is running the exhaust contains chemicals such as unburned hydrocarbons and carbon monoxide. The content of the exhaust fumes is known to cause respiratory problems, cancer, birth defects or other reproductive harm.
Carbon monoxide is colorless and tasteless and is always present in exhaust fumes. The onset of carbon monoxide poisoning is distinguished by a slight dizziness which may or may not be recognized by the victim. A person may collapse and lapse into unconsciousness with no warning if the concentration of carbon monoxide is sufficiently high.
Since carbon monoxide is colorless and odorless, its presence can not be detected. Any time exhaust odors are noticed, carbon monoxide is present
Never use a petrol powered power cutter indoors or in trenches more than 1m (3ft) deep or in other areas with poor ventilation. Ensure proper ventilation when
working in trenches or other confined areas.
• This product produces an electromagnetic field during operation. This field may under some circumstances interfere with active or passive medical implants. To reduce the risk of serious or fatal injury, we recommend persons with medical
implants to consult 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 get into a situation where you feel unsafe, stop
and seek expert advice. Contact your servicing dealer. Do not attempt any task that you feel unsure of!

Safety instructions for assembly

WARNING: Read the warning instructions that follow before you assemble the product.

• Make sure that the engine is off and that the stop switch is in the STOP position.
• Always use protective gloves when you assemble the product.

Safety instructions for operation


WARNING: Read the warning instructions that follow before you use the product.

• Before using a power cutter you must understand the effects of kickback and how to avoid them. Refer to Kickback on page 10 .
• Never use a product that is faulty. Carry out the safety checks, maintenance and service instructions described in this manual. Some maintenance and service measures must be carried out by trained and qualified specialists. Refer to Maintenance on page 22.
• Never use the product if you are fatigued, while under the influence of alcohol or drugs, medication or anything that could affect your vision, alertness,
coordination or judgement.
• 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.
• Use a cutting blade only for material that it is made to cut.
• Do not cut asbestos material

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). You are responsible to ensure that animals and onlookers are not within the working area. Do not
start cutting until the working area is clear and you are standing firmly.
• Observe your surroundings to ensure that nothing can affect your control of the product.
• Ensure 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 bad weather, such as dense fog, heavy rain, strong wind, intense cold, etc.
Working in bad weather is tiring and can lead to dangerous conditions, such as slippery surfaces.
• Never start to work with the product before the working area is clear and you have a firm foothold.
Look out for any obstacles with unexpected movement.
• Ensure when cutting that no material can become loose and fall, causing injury to the operator. Take great care when working on sloping ground.
• Ensure that the working area is sufficiently illuminated to create a safe working environment.
• Make sure that no pipes or electrical cables are routed in the working area or in the material to be cut.
• If cutting into a container (drum, pipe, or other container) you must first make sure it does not contain flammable or other volatile material.

Personal protective equipment

WARNING: Read the warning instructions 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 motor 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.
• Use approved respiratory protection. The use of products such as cutters, grinders, drills, that sand or form material can generate dust and vapors 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 first aid kit near.
• Sparks can come from the muffler or the blade.
Always have a fire extinguishing available.

Safety devices on the product

WARNING: Read the warning instructions that follow before you use the product.

• Never use a product that has faulty safety equipment! If your product fails any checks contact your service agent to get it repaired.
• Do not use the product if protective plates, protective covers, safety switches or other protective devices are not attached or are defective.

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 move back to their initial positions. This function locks the throttle trigger at idle speed.

To examine the throttle trigger lockout

1. Make sure that the throttle trigger is locked at the idle position when the throttle lockout is released.

2. Push the throttle lockout and make sure it goes back when you release it

3. Make sure that the throttle trigger and throttle lockout move freely and that the return springs work correctly.

4. Start the product and apply full throttle.

5. Release the throttle control and make sure that the cutting blade stops and stays stationary. If the cutting blade rotates at idle position, you must adjust
the idle speed. Refer to To adjust the idle speed on page 26.

To examine the stop switch

1. Start the engine.
2. Push the start/stop switch to the STOP position. The engine must stop Blade guard, blade guard extender and dust shield

WARNING: Make sure that the blade guard, the blade guard extender and the dust shield are correctly attached before you start the product. Do not use the product if the blade guard, the blade guard extender or the dust shield are missing, cracked or defective.

• The blade guard, the blade guard extender and the dust shield keep dust away from the operator and prevent injury if the cutting blade breaks. The blade
guard extender and the dust shield are spring loaded and must always move freely and must always return instantly by spring force.
• Do not use the product if the blade guard extender or the dust shield are clamped or tied into the retracted position.

To examine the cutting blade, the blade guard and the blade guard extender

1. Make sure that the cutting blade (B) is attached correctly and that it is not damaged.
2. Make sure that the blade guard (A), the blade guard extender (D) and the dust shield (C) do not have cracks or other damage.
3. Make sure that the dust shield can be pushed in and return instantly by spring force
4. Make sure that the blade guard can be pushed in and return instantly by spring force.
5. Replace the cutting blade and the blade guard if they are damaged. Replace the blade guard extender, the dust shield or their springs if they are defected and
not returning instantly when pushed in.

Vibration damping system

WARNING: Overexposure to vibration can lead to circulatory damage or nerve damage
in people who have impaired circulation.
Contact your doctor if you experience symptoms of overexposure to vibration.
Such symptoms include numbness, loss of feeling, tingling, pricking, pain, loss of
strength, changes in skin color or condition.
These symptoms normally appear in the fingers, hands or wrists. These symptoms
may be increased in cold temperatures

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.
Cutting granite or hard concrete creates more vibration than cutting soft concrete. Cutting with cutting equipment that is blunt or faulty (wrong type or badly sharpened) will increase the vibration level.

To do a check of the vibration damping system

WARNING: Make sure that the engine is switched 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.
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 gets very hot during and after use. This also applies during idling. Be aware of the fire hazard, especially when working near flammable substances and/or vapors.

To examine the muffler

1. Make sure that the muffler is not damaged.
2. Make sure that the muffler is correctly attached.

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 kickback and how to avoid it before using the product.

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.

Rotational kickback

A rotational kickback occurs when the cutting blade does not move freely in the kickback zone

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 powercutter
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: If the blade is pinched in the kickback zone it will cause a severe
kickback.

Special care should be taken when cutting in pipes. If 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
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 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

Fuel safety

WARNING: Read the warning instructions that follow before you use the product.

• Make sure there is plenty of ventilation when refueling or mixing fuel (petrol and two-stroke oil).
• Take care when handling fuel. Fuel and fuel vapor are highly flammable. Be aware of the risks of fire, explosion and those associated with inhalation.
• Do not smoke and do not place any hot objects in the vicinity of fuel.
• Always stop the engine and let it cool for a few minutes before refueling.
• When refueling, open the fuel cap slowly so that any excess pressure is released gently.
• Tighten the fuel cap carefully after refueling. If the cap is not properly tightened, the cap might vibrate lose and fuel may escape from the fuel tank creating a fire hazard.
• Never refuel the machine while the engine is running.
• Always move the product at least 3 m (10 ft) away from the refueling area and source before starting.
After refueling, there are some situations where you must never start the product:
• If you have spilled fuel on the product. Wipe off the spillage and allow remaining fuel to evaporate.
• If you have spilled fuel on yourself or on your clothes. Change your clothes and wash any part of your body that has come in contact with fuel. Use soap and water.
• If the product leaks fuel. Regularly do a check for leaks from the fuel cap and fuel lines.

Safety instructions for maintenance

WARNING: Read the warning instructions that follow before you use the product.

• The user must only carry out the maintenance and service work described in this Operator´s Manual.
More extensive work must be carried out by an authorized service workshop.
• Make sure that the engine is switched off and that the stop switch is in STOP position.
• Use personal protective equipment. Refer to Personal protective equipment on page 6.
• If the maintenance is not done correctly and regularly, there is an increased risk of injury and damage to the product.
• Only do the maintenance as this operator´s manual recommends. Let a Husqvarna service agent 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.