Certa 25cc 10" Chainsaw - (CTCHNSAW10EVA) - Manual

 

Safety & Warnings

 

	Read this entire manual before operating this machine.
	Always use the chain saw with two hands.
	Read, understand and follow all warnings.
	Wear head, eye and ear protection.
	Warning! Danger of kickback.

 

For Safe Operation

 

• Never operate a chainsaw when you are fatigued, ill, upset, under the influence of medication that may make you drowsy or if you are under the influence of alcohol or drugs.
• Use safety footwear, snug-fitting clothing and eye, ear and head protection equipment.
• Always use caution when handling fuel. Wipe up all spills and then move the chainsaw at least three metres from the fueling point before starting the engine.
  • Eliminate all sources of sparks or flame (i.e. smoking, open flames or work that can cause sparks) in the areas where fuel is mixed, poured or stored.
  • Do not smoke while handling fuel or while operating the chainsaw.
• Do not allow other persons to be near the chainsaw when starting the engine or cutting wood. Keep bystanders and animals out of the work area. Children, pets and bystanders should be a minimum of 10 metres away when you start or operate the chainsaw.
• Never start cutting until you have a clear work area, secure footing and planned retreat path from the falling tree.
• Always hold the chainsaw firmly with both hands when the engine is running. Use a firm grip with thumb and fingers encircling the chainsaw handles.
• Keep all parts of your body away from the saw chain when the engine is running.
• Before you start the engine, make sure the saw chain is not contacting anything.
• Always carry the chainsaw with the engine stopped and the guide bar and saw chain to the rear and the muffler away from your body.
• Always inspect the chainsaw before each use for worn, loose or damaged parts. Never operate a chainsaw that is damaged, improperly adjusted or is not completely and securely assembled. Be sure that the saw chain stops moving when the throttle control trigger is released.
• All chainsaw service, other than the items listed in the User Manual, should be performed by a qualified technician.
• Always shut off the engine before setting it down.
• Use extreme caution when cutting small size bushes and saplings because slender material may catch the saw chain and be whipped towards you or pull you off balance.
• When cutting a limb that is under tension, be alert for spring-back. The limb may strike you when the tension in the wood fibres is released.
• Never cut in high wind, bad weather, when visibility is poor or in very high or low temperatures. Always check the tree for dead branches which could fall during the felling operation.
• Keep the handles dry, clean and free of oil or fuel mixture.
• Operate the chainsaw only in well-ventilated areas. Never start or run the engine inside a closed room or building. Exhaust fumes contain dangerous carbon monoxide.
• Do not operate a chainsaw in a tree unless specially trained to do so.
• Guard against kickback. Kick-back is the upward motion of the guide bar which occurs when the saw chain at the nose of the guide bar contacts an object. Kickback can lead to a dangerous loss of control of the chainsaw.
• When transporting your chainsaw, make sure the appropriate guide bar scabbard is in place.

 

Kickback Safety Precautions for Chain Saw Users Warning

 

Kickback may occur when the nose or tip of the guide bar touches an object or when the wood closes in and pinches the saw chain in the cut. Tip contact in some cases may cause a lightning-fast reverse reaction, kicking the guide bar up and back towards the operator. Pinching the saw chain along the top of the guide bar may push the guide bar rapidly back towards the operator. Either of these reactions may cause you to lose control of the saw which could result in serious personal injury or death.

With a basic understanding of kickback, you can reduce or eliminate the element of surprise contributing to accidents.

 

 

• Do not rely exclusively on the safety devices built into your saw. As a chainsaw user, you should take several steps to keep cutting jobs free from accident or injury.
• Keep a good grip on the saw with both hands, the right hand on the rear handle and the left hand on the front handle when the engine is running. Use a firm grip with thumbs and fingers encircling the chain saw handles. A firm grip will help you reduce kickback and maintain control of the saw. Don’t let go.

 

 

Make certain that the area in which you’re cutting is free from obstructions. Do not let the nose of the guide bar contact a log, branch or any other obstruction which could hit while you are operating the saw.

 

 

• Cut at high engine speeds.
• Do not overreach or cut above shoulder height.
• Follow manufacturers sharpening and maintenance instructions for the saw chain.
• Only use replacement bars and chains specified by the manufacturer or the equivalent.

 

Overview

 

Note: For safe use, symbols are placed on the saw. Follow these instructions at all time.

 

	The port to refuel: Mixed Petrol Only Position: Fuel cap
	The port to top up chain oil Position: Oil cap
	Setting the switch to the “O” position, the engine stops immediately. Position: Rear-left of the unit
	Starting the engine. If you pull out the choke knob (at the back-right of the rear handle) to the point of the arrow, you can set the starting mode as follows: First-stage position-starting mode when the engine is warm. Second-stage position-starting mode when the engine is cold. Position: Upper-right of the air cleaner cover
H L T	The screw under the “H” stamp is the High-speed adjustment screw. The screw under the “L” stamp is the Slow-speed adjustment screw. The screw at the left of the “T” stamp is the Idle adjustment screw Position: Left side of the rear handle
	Shows the directions that the chain brake is Released (white arrow) and Activated (black arrow). Position: Front of the chain cover

 

Components

 

 

1. Body	2. Guide Bar
3. Saw Chain	4. Guide Bar Cover
5. Tool Kit	6. Mix Tank
7. Belt	8. Manual

 

Installation

 

Warning: The saw chain has very sharp edges. Use thick protective gloves for safety.

Open the box and install the guide bar and the saw chain on the power unit as follows:

 

Step 1:

Pull the guard towards the front handle to check that the chain brake is not engaged.

 

Step 2:

Loosen the nuts and remove the chain cover.

 

 

Step 3:

Gear the chain to the sprocket and, while fitting the saw chain around the guide bar, mount the guide bar to power unit. Adjust the position of chain tensioner nut on the chain cover to the lower hole of the guide bar.

 

 

1.	Hole
2.	Direction of Rotation
3.	Chain Tensioner Nut

 

Step 4:

Fit the chain cover to the power unit and fasten the nuts to finger tightness.

 

 

Step 5:

While holding up the tip of the bar, adjust the chain tension by turning the tensioner screw until the tie straps just touch the bottom side of the bar rail.

 

 

Step 6:

Tighten the nuts securely with the bar tip held up (12~15N.m). Then check the chain for smooth rotation and proper tension while moving it by hand. If necessary, readjust with the chain cover so it is loose.

 

 

Step 7:

Tighten the tensioner screw.

Note: A new chain will expand its length at the beginning of use. Check and readjust the tension frequently as a loose chain can easily derail or cause rapid wear of itself and the guide bar.

 

Fuel & Chain Oil

 

Fuel

Warning!

• Petrol is very flammable. Avoid smoking or bringing any flame or sparks near fuel. Make sure to stop the engine and allow it cool before refuelling the unit. Select outdoor bare ground for fuelling and move at least 3m (10ft) away from the fueling point before starting the engine.

 

 

• Use anti-oxidant added quality oil expressly labelled for air-cooled 2-cycle engine use (Jasco FF Grade Oil or ISO EAC Grade).

 

 

• Do not use BIA or TCW (2-stroke water-cooling type) mixed oil.

 

Recommended Mixing Ratio

Petrol 25: Oil 1

• Exhaust emissions are controlled by the fundamental engine parameters and components (e.g. carburetion, ignition timing and port timing) without the addition of major hardware or the introduction of inert material during combustion.
• These engines are certified to operate on unleaded petrol.
• Make sure to use petrol with a minimum octane number of 89 RON.
• If you use petrol of a lower octane value than prescribed. There is a danger that the engine temperature may rise and an engine problem such as piston seizing may consequently occur.
• Unleaded petrol is recommended to reduce the contamination of the air for the sake of your health and the environment.
• Poor quality petrol or oils may damage sealing rings, fuel lines or fuel tank of the engine.

 

How to Mix Fuel

Pay attention to agitation

1. Measure out the quantities of petrol and oil to be mixed.
2. Put some of the petrol into a clean, approved fuel container.
3. Pour in all of the oil and agitate well.
4. Pour in the rest of petrol and agitate again for at least one minute. As some oils may be difficult to agitate depending on oil ingredients, sufficient agitation is necessary for the engine not to be damaged. If the agitation is insufficient, there is an increased danger of early piston seizing due to an abnormally lean mixture.
5. Put a clear indication on the outside of the container to avoid mixing up with petrol or other containers.
6. Indicate the contents on the outside of the container for easy identification.

 

Fuelling the Unit

• Untwist and remove the fuel cap. Rest the cap on a dustless place.
• Put fuel into the fuel tank up to 80% of the full capacity.
• Fasten the fuel cap securely and wipe up any fuel spillage around the unit.

 

Warning

• Select bare ground for fuelling.
• Move at least 3 metres (10 feet) away from the fueling point before starting the engine.
• Stop the engine before refuelling the unit. At that time, be sure to sufficiently agitate the mixed petrol in the container.

 

To preserve your engines life, avoid:

• Fuel with no oil (Raw Petrol): It will cause severe damage to the internal engine parts very quickly.
• Gasohol: It can cause deterioration of rubber and/or plastic parts and hinder engine lubrication.
• Oil for 4-cycle engine use: It can cause spark plug fouling, exhaust port blocking or piston ring sticking.
• Mixed fuels which have been left unused for a period of one month or more may clog the carburettor and result in the engine failing to operate properly.
• If you are storing the product for a long period of time, clean the fuel tank after emptying it. Next, activate the engine and empty the carburettor of the composite fuel.
• In the case of scrapping the used mixed oil container, scrap it only at an authorised repository site.

 

Chain Oil

• Use special chainsaw oil all year round.
• Do not use wasted or regenerated oil that can cause damage to the oil pump.

 

Operation

 

Starting the Engine

 

1. Fill fuel and chain oil tanks respectively and tighten the caps securely.

 

 

2. Continuously push the priming bulb until fuel comes in the bulb. (OP2)

 

 

3. Set the switch to “I” position.

 

 

1.	Throttle Interlock	When The Engine Is Cool
2.	Throttle Lever	When The Engine Is Warm-Up
3.	Choke Knob	After The Engine Starts

 

Start-Up

 

Remove the protector (1).

Before starting the machine, make sure that the moving parts of the machine are not in contact with any object.

 

Cold-Starting the Engine

1. Set the switch in the start position “I”.

 

 

2. Press the “primer” choke several times (from 7 to 10) to ensure that the fuel has reached the carburettor.

3. Pull the air lever CHOKE.

 

 

4. Place the machine on the floor in a stable and horizontal position.

5. Firmly hold the front handle with your left hand and hold the rear of the saw with your right knee.

 

 

6. Pull the starter cord until the motor starts or starts firing.

7. Push in the air level (normal working position RUN).

 

 

8. If the tool has not started, pull the starting rope again (6) until it starts.

9. Leave the engine to warm up for a few minutes before using the machine.

 

Starting with a Warm Engine

1. Set the switch to the (I) position.
2. Make sure the choke/air level is set to RUN.
3. Place the machine on the ground on a horizontal and stable location.
4. Firmly hold the front handle with your left hand and hold the rear of the saw with your right knee.
5. Pull the Start cord until the engine starts.

If after a few attempts the machine does not start, follow the steps of starting with a cold engine.

 

Checking the Oil Supply

After starting the engine, run the chain at medium speed and see if chain oil is scattered off as shown in the figure.

 

 

The chain oil flow can be changed by inserting a screwdriver in the hole on the bottom of the clutch side. Adjust according to your work conditions.

 

 

(1) Chain oil flow adjusting shaft

(a) Rich

(b) Lean

 

Note: The oil tank should become nearly empty by the time fuel is used up. Be sure to refill the oil tank every time when refuelling the saw.

 

Adjusting the carburettor

 

 

The carburettor on your unit has been factory adjusted but may require fine-tuning due to a change in operating conditions.

Before adjusting the carburettor, make sure that the provided air/fuel filters are clean and fresh and the fuel is properly mixed.

When adjusting, take the following steps:

Note: Be sure to adjust the carburettor with the bar chain attached.

1. Stop engine and screw in both the H and L needles until they stop. Never force them. Then unscrew them a quarter turn.
2. Start the engine and allow it to warm up at half-throttle.
3. Turn the L needle slowly clockwise to find a position where the idling speed is maximum and then set the needle back by a quarter (1/4) turn counterclockwise.
4. Turn the idle adjusting screw (T) counterclockwise so that the saw chain does not turn. If the idling speed is too slow, turn the screw clockwise.
5. Make a test cut and adjust the H needle for best cutting power, not for maximum speed.

 

Chain Brake

This machine is equipped with an automatic brake to stop saw chain rotation upon the occurrence of kickback during cutting. The brake is automatically operated by inertial force, which acts on the weight fitted inside the front guard. This brake can also be operated manually with the front guard turned down to the guide bar. To release the brake, pull up the front guard toward the front handle till a “click” sound is heard.

 

 

Caution: Be sure to confirm the brake operates normally during your daily inspection.

 

How to Confirm:

1. Turn off the engine.
2. Hold the chainsaw horizontally and release your hand from the front handle.
3. Hit the tip of the guide bar with a stump or a piece of wood and confirm that the brake is working.

In case the brake is not effective, contact Kogan.com support.

If the engine keeps rotating at high speed with the brake engaged, the clutch will overheat causing danger or damage.

When the brake engages during operation, immediately release the throttle lever to stop the engine.

 

Stopping the Engine

 

 

1. Release the throttle lever to allow the engine to idle for a few minutes.
2. Set the switch to the “O” (STOP) position.

 

Sawing

 

Safety Instructions:

• Before proceeding to your job, read the entire manual. It is recommended to first practice sawing easy logs. This also helps you get accustomed to your saw.
• Always follow the safety regulations. The chain saw must only be used for cutting wood. Never cut other types of material, vibrations and kick-back vary with different materials and the requirements of the safety regulations would not be met. Do not use the chainsaw as a lever for lifting, moving or splitting objects. Do not lock it with lever fixed stands. Never hitch tools or applications to the PTO that are not specified by the Kogan.

 

 

• It is not necessary to force the saw into the cut. Apply only light pressure while running the engine at full throttle.
• When the saw chain is caught in the cut, do not attempt to pull it out by force, but use a wedge or a lever to open the way, after the saw has been turned off.

 

Guard Against Kickback

 

 

• This saw is equipped with a chain brake that will stop the chain in the event of kickback if operating properly. You must check the chain brake operation before each usage by running the saw at full the throttle for 1-2 seconds and pushing the front hand guard-forward. The chain should stop immediately with the engine at full speed. If the chain is slow to stop or does not stop, contact Kogan.com support.

 

 

• It is extremely important that the chain brake is checked for proper operation before each use and that the chain is sharp in order to maintain the kickback safety level of this saw. Removal of the safety devices, inadequate maintenance or incorrect replacements of the bar or chain may increase the risk at serious personal injury due to kickback.

 

Felling a Tree

 

 

1. Decide the felling direction considering the wind, lean of the tree, location of heavy branches, ease of completing the task after felling and other factors.
2. While clearing the area around the tree, arrange a good foothold and retreat path.
3. Make a notch cut one-third of the way into the tree on the felling side.
4. Make a felling cut from the opposite side of the notch and at a level slightly higher than the bottom of the notch.

Warnings: When you fell a tree, be sure to warn neighbouring workers about the danger.

 

Bucking and Limbing

Warning

• Always ensure your foothold. Do not stand on the log.
• Be alert to the rolling over of a cut log. Especially when working on a slope, stand on the uphill side of the log.
• Before starting work, check the direction of the bending force inside the log to be cut.
• Always finish cutting from the opposite side of bending direction to prevent the guide bar from being caught in the cut.

 

A Log Lying On the Ground

 

 

Saw down halfway, then roll the log over and cut from the opposite side.

 

A Log Propped Off the Ground

 

 

In section "A" saw up from the bottom one-third and finish by sawing down from the top. In area "B", saw down from the top one-third and finish by sawing up from the bottom.

 

 

Cutting Limb of a Fallen Tree

First check to which side the limb is bent. Then make the initial cut from the bent side and finish by sawing from the opposite side.

Warnings: Be alert of the springing back of a cut limb.

 

Pruning of Standing Tree

 

 

Cut up from the bottom, finish down from the top.

 

Warning

• Do not use an unstable foothold or ladder.
• Do not overreach.
• Do not cut above shoulder height.
• Always use both hands to grip the saw.

 

Cleaning & Care

 

Warnings: Before cleaning, inspecting or repairing your unit, make sure that the engine has stopped and is cool. Disconnect the spark plug to prevent accidental starting.

 

Maintenance after Each Use

 

1. Air Filter

Dust on the cleaner surface can be removed by tapping a corner of the cleaner against a hard surface. To clean dirt in the meshes, split the cleaner into halves and brush in unleaded petrol. When using compressed air, blow from the inside.

 

 

To assemble the cleaner halves, press the rim until it clicks.

 

2. Oiling Port

Dismount the guide bar and check the oiling port for clogging.

 

 

3. Guide Bar

When the guide bar is dismounted, remove sawdust in the bar groove and the oiling port. Grease the nose sprocket from the feeding port on the tip of the bar.

 

 

4. Others

Check for fuel leakage and loose fastenings and damage to major parts, especially handle joints and guide bar mounting. If any defects are found, make sure to have them repaired before operating the saw again.

 

Periodical Service Points

1. Cylinder Fins

Dust clogging between the cylinder fins will cause overheating of the engine. Periodically check and clean the cylinder fins after removing the air cleaner and the cylinder cover. When installing the cylinder cover, make sure that the switch wires and grommets are positioned correctly in place.

 

 

Note: Be sure to block the air intake hole.

 

2. Fuel filter

(a) Using a wire hook, take out the filter from the filler port.

(b) Disassemble the filter and with unleaded petrol or replace with a new one if needed.

Note:

• Alter removing the filter, use a pinch to hold the end of the suction pipe
• When assembling the filter, take care not to allow filters fibres or dust inside the suction pipe

 

3. Oil Tank

With a wire hook, take out the oil filter through the filler port and clean in unleaded petrol. When putting the filter back into the tank, make sure that it comes to the front right corner. Clean off dirt in the tank.

 

 

4. Spark Plug

Clean the electrodes with a wire brush and reset the gap to 0.65mm as necessary.

 

 

5. Sprocket

 

 

Check for cracks and for excessive wear interfering with the chain drive. If the wear is considerable, replace it with a new one. Never fit a new chain on a worn sprocket or a worn chain on a new sprocket.

 

Saw Chain

It is very important for smooth and safe operation to always keep the cutters sharp.

 

The cutter needs to be sharpened when:

• Sawdust becomes powder-like.
• You need extra force to saw in.
• The cut way does not go straight.
• Vibration increases.
• Fuel consumption increases.

 

Cutter setting standards

Be sure to wear safety gloves.

 

Before Filing

• Make sure the saw chain is held securely.
• Make sure the engine is stopped.
• Use a round file of the proper size for the chain.

 

Pitch (mm)

1.27mm

 

 

After each cutter has been filed, check the depth gauge and file it to the proper level as illustrated.

 

 

Be sure to round off the front edge to reduce the chance of kickback or tie-strap breakage.

Make sure every cutter has the same length and edge angles as illustrated.

 

 

Guide Bar

• Reverse the bar occasionally to prevent partial wear.
• The bar rail should always be square. Check for wear of the bar rail. Apply a ruler to the bar and the outside of a cutter. If a gap is observed between them, then the rail is normal. Otherwise, the bar rail is worn. Such a bar needs to be corrected or replaced.

 

 

Specifications

 

Displacement (cm3)	25.4cc
Fuel	Mixture 4% (Petrol 25 TWO-cycle oil 1)
Fuel tank capacity (ml)	230ml
Chain oil	Motor oil SAE# 10W-30
Oil tank capacity (ml)	160ml
Carburettor	Diaphragm type
Oil feeding system	Mechanical pump
Sprocket (Teeth Pitch)	6Tx3/8”
Dimensions(L x W x H) (mm)	265 x 220 x 220mm
Power unit only (kg)	2.90kg
Guide bar Type	Sprocket nose
Size (mm)	250mm
Pitch (mm)	1.27mm
Chain	3/8x40
A-weighted sound power level ISO 22868	9.5m/s2 (K=1.5m/s2)
Equivalent vibration total value according to ISO 22867	96dB (A) (K=2dB(A))

 

Troubleshooting

 

Issue	Cause	Solution
Unable to start	Check fuel for water or substandard mixture.	Replace with proper fuel.
	Check for engine flooding.	Remove and dry the spark plug. Then pull the starter again with no choke.
	Check the spark ignition.	Replace with a new plug.
Lack of power Poor acceleration Rough idling	Check fuel for water or substandard mixture.	Replace with proper fuel.
	Check air filter and fuel filter for clogging.	Clean them.
	Check carburettor for inadequate adjustment.	Readjust speed needles.
Oil does not come out	Check the oil for substandard quality.	Replace it.
	Check oil passage and ports for clogging.	Clean them.

 

Disposal

 

This marking indicates that this appliance should not be disposed of with other household wastes. To prevent possible harm to the environment or human health from uncontrolled waste disposal, recycle it responsibly to promote the sustainable reuse of material resources.