Certa 25CC 10" Chainsaw - (CTCHNSAW10A) - Manual

Safety and Warnings

• 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 chain saw at least three meters 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 meters away when you start or operate the chain saw.
• 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 chain saw 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 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 changed 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 chain saw service, other than the items listed in the User Manual, should be performed by competent chainsaw service personnel.
• Always shut off the engine before setting it down.
• Use extreme caution when cutting small size brush and saplings because slender material may catch the saw chain and be whipped toward you or pull you off balance.
• When cutting a limb that is under tension, be alert for spring back so that you will not be struck when the tension in the wood fibres is released.
• 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 chain saw in a tree unless specially trained to do so.

Kickback Safety Precautions

• 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.
• 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 be 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 saw chain.
• Only use replacement bars and chains specified by the manufacturer or the equivalent.

Installation

1. Installing guide bar and saw chain

(1) Power unit
(2) Guide bar
(3) Saw chain
(4) Plug wrench
(5) Screwdriver for carburettor adjustment

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

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

1. Pull the guard towards the front handle to check that the chain brake is not engaged.
2. Loosen the nuts and remove the chain cover.
3. Gear the chain to the sprocket and, while fitting the saw chain around the guide bar, mount the guide bar to power the unit. Adjust the position of chain tensioner nut on the chain cover to the lower hole of guide bar.

Part Lists
(1) Hole
(2) Moving direction
(3) Chain tensioner nut

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

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.

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 loose.
7. Tighten the tensioner screw.

Note: A new chain will expand in 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.

2. Fuel and Chain Oil

• Unleaded 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 fueling and move at least 3 m (10 ft) away from the fueling point before starting the engine.

• Use an anti-oxidant added quality oil expressly labelled tor air-cooled 2-cycle engine use (JASO FC GRADE OIL or ISO EGC GRADE).
• Do not use BIA or TCW(2-stroke water-cooling type)mixed oil.

Recommended mixing ratio: Unleaded Petrol 25: Oil 1

• Exhaust emission is controlled by the fundamental engine parameters and components (Eq. carburetion, ignition timing and port timing) without the addition of any major hardware or the introduction of an inert material during combustion.
• These engines are certified to operate on unleaded unleaded petrol.
• Make sure to use unleaded petrol with a minimum octane number of 89RON.
• If you use unleaded 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 cones- quaintly occur.
• Unleaded petrol is recommended to reduce the contamination of the air for the sake of your health and the environment.
• Poor quality unleaded petrol or oils may damage sealing rings, fuel lines or fuel tank of the engine.

How to mix fuel

1. Measure out the quantities of unleaded petrol and oil to be mixed.
2. Put some of the unleaded petrol into a clean, approved fuel container.
3. Pour in all of the oil and agitate well.
4. Pour in the rest of unleaded 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 to last long. Be careful that, if the agitation is insufficient, there is an increased danger of early piston seizing due to abnormally lean
5. Put a clear indication on the outside of the container to avoid mixing up with unleaded petrol or other containers.
6. Indicate the contents on the outside of the container for easy identification.

Fueling the unit

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

• Select bare ground for fueling.
• Move at least 10 feet (3 meters) 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 unleaded petrol in the container.

For your engine 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 disruption of engine lubrication.
• Oil FOR4-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.
• In the case of storing the product for a long period of time, clean the fuel tank after rendering it empty. Next, activate the engine and empty the carburettor of the composite fuel.
• In the case of the scrapping of mixed oil container, scrap it only at an authorized repository site.

Note: As for details of quality assurance, read the description in the section Limited Warranty carefully. Moreover, normal wear and change in the product with no functional influence are not covered by the warranty. Also, be careful that, if the usage in the instruction manual is not observed as to the mixed unleaded petrol, etc. described herein, it may not be covered by the warranty.

Chain Oil

Use a specialised chainsaw oil all year round.

Note: 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.

4. Pull out the choke knob to the second-stage position. The choke will close and the throttle lever will then be set in the starting position.
5. When restarting immediately after stopping the engine. Choke knob in the first-stage position (choke open and throttle lever in the starting position)
6. Once the choke knob has been pulled out, it will not return to the operating position even if you press down on it with your finger. When you wish to return the choke knob to the operating position, pull out the throttle lever instead.
7. While holding the saw unit securely on the ground, pull the starter rope vigorously.

8. When the engine has ignited, first push in the choke knob to the first-stage position and then pull the starter again to start the engine.
9. Allow the engine to warm up with the throttle lever pulled slightly.

Keep clear of the saw chain as it will start rotating upon starting to engine.

Checking 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 bottom of the clutch side. Adjust according to your work conditions.(OP8)

(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 refueling 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 properly mixed.

When adjusting, take the following steps:

Note : Be sure  to adjust the carburetor the bar chain attached

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.

How to confirm:
3. Turn off the engine.
4. Holding the chain saw horizontally, release your hand from the front handle, hit the tip of guide bar to a stump or a piece of wood, and confirm brake operation. Operating level varies by bar size.
In case the brake is not effective, ask our dealer for inspection and repairs.
If the engine keeps rotating at high speed with the brake engaged, the clutch will overheat causing trouble.
When the brake engages during operation, immediately release the throttle lever to stop the engine.
5. Stop engine and screw in both the H and L needles until they stop. Never force them. Then set them back the initial number of turn as shown below.
H needle –1/4
L needle –1/4
6. Start the engine and allow it to warm up at half-throttle.
7. Turn the L needle slowly clockwise to find a position where idling speed is maximum, then set the needle back a quarter (1/4) turn counter clockwise.
8. 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.
9. Make a test cut and adjust the H needle for best cutting power, not for maximum speed.

Sawing

• Always follow the safety regulations. The chain saw must only be used for cutting wood. It is forbidden to cut other types of material. Vibrations and kickback vary with different materials and the requirements of the safety regulations would not be respected. Do not use the chain saw as a lever for lifting, moving or splitting objects. Do not lock it over fixed stands. It is forbidden to hitch tools or applications to the P.t.o. that are not specified by the manufacturer.
• 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 cut to release the blade.

Felling a Tree (F22)

 

(1) Notch cut
(2) Felling cut
(3) Felling direction

1. Decide the felling direction considering the wind, lean of the tree, location of heavy branches, ease of job 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.

When you fell a tree, be sure to warn your neighbouring workers of the danger.

Bucking and Limbing

• 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.
• Follow the instructions in "For Safe Operation" to avoid kickback of the saw. Before starting work, check the direction of 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 (F 23)

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

A Log Propped Off the Ground (F 24)

In area 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 (F 25)

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.

Be alert to the springing back of a cut limb.

Pruning of Standing Tree (F 26)

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

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

Maintenance

Maintenance, replacement, or repair of the emission control device and systems may be performed by any nonroad engine repair establishment or individual.

Before cleaning, inspecting or repairing your unit, make sure that 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 switch wires and grommets are positions correctly in place.

 

Be sure to block the air intake hole.

2. Fuel filter

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

• Disassemble the filter and with unleaded petrol, or replace with a new one if needed.

Note:  • Alter removing the biter, use a pinch to hold the end of the suction pipe • When assembling the litter, take care not to allow filters fibres or dost 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. Also clean off dirt in the tank.

4. Spark Plug

Clean the electrodes with a wire brush and reset the gap to 0.65 mm 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 keep the cutters always sharp.
Your cutters need 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 Filling

• 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.

Model	Green Saw25/N
Pitch (in.(mm))	1/20” (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, the rail is normal.

Otherwise, the bar rail is worn. Such a bar needs to be corrected or replaced.

Troubleshooting

Issue	Cause	Solution
Start Failure	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.	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 the filter
	Check carburettor for inadequate adjustment.	Readjust carburettor
Oil does not come out	Check oil for substandard quality.	Replace oil
	Check oil passage and ports for clogging.	Clean ports