7. Use only replacement bars and chains specied by the manufacturer or the equivalent. DO NOT OPERATE A CHAINSAW WITH ONE HAND. Serious injury to the operator, helpers, and/or bystanders may result from one-handed operation. A chainsaw is intended for two-handed use. DO NOT OPERATE A CHAINSAW WHEN YOU ARE FATIGUED. Never operate a chainsaw when you are tired or under the inuence of medication, drugs, or alcohol. USE SAFETY FOOTWEAR. Wear snug-fitting clothing, protective gloves, and eye, hearing, and head protection devices. DO NOT STAND ON ANY UNSTABLE SURFACE while using your chainsaw: that includes ladders, scaffolds, trees, etc. USE CAUTION WHEN HANDLING FUEL. Move the chainsaw at least 50 feet (15 m) from the refuelling point before starting the engine. DO NOT ALLOW OTHER PERSONS to be near the chainsaw when starting or cutting with the chainsaw. Keep bystanders and animals out of the work area. DO NOT START CUTTING until you have a clear work area, secure footing, and a planned retreat path from the falling tree. KEEP ALL PARTS OF YOUR BODY away from the saw chain when the engine is running. ALWAYS CARRY THE CHAINSAW WITH THE ENGINE STOPPED AND THE BRAKE ENGAGED, the guide bar and saw chain to the rear, and the silencer away from your body. When transporting the chainsaw, use the appropriate guide bar scabbard. DO NOT OPERATE A CHAINSAW THAT IS DAMAGED, improperly adjusted, or not completely and securely assembled. Be sure that the saw chain stops moving when the throttle control trigger is released. TURN OFF THE ENGINE before putting the chainsaw down. DO NOT leave the engine running unattended. As an additional safety precaution, apply the chain brake before putting down the saw. 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 under tension, be alert for spring-back so that you will not be struck when the tension in the wood bres is released. 21 KEEP THE HANDLES dry, clean, and free of oil or fuel mixture. OPERATE THE CHAINSAW ONLY in well-ventilated areas. DO NOT OPERATE A CHAINSAW IN A TREE unless you have been specically trained to do so. ALWAYS HAVE A FIRE EXTINGUISHER AVAILABLE WHEN USING CHAIN SAW. Use guide bar cover during transport and storage. The chain saw should always be used with correctly mounted spiked bumper. FOLLOW THE SHARPENING and maintenance instructions for the saw chain. USE ONLY THE REPLACEMENT GUIDE BARS and low kick-back chains specied for your saw. DO NOT adapt your powerhead to a bow guide or use it to power any attachments or devices not listed for your saw. SAVE THESE INSTRUCTIONS. Refer to them frequently and use to instruct other users. If you lend someone this tool, lend them these instructions also.

SPECIFIC SAFETY RULES

WARNING The warnings, labels, and instructions found in this section of the operator s manual are for your safety. Failure to follow all instructions may result in serious personal injury. GENERAL PRECAUTIONS DO NOT CUT VINES and/or small undergrowth (less than 76 mm (3 in.) in diameter). MUFFLER SURFACES ARE VERY HOT during and after operation of the chainsaw; keep all body parts away from the mufer. Serious burns may occur if contact is made with the mufer. ALWAYS HOLD THE CHAINSAW WITH BOTH HANDS when the engine is running. Use a rm grip with thumbs and ngers encircling the chainsaw handles. NEVER LET ANYONE USE YOUR CHAINSAW who has not received adequate instructions in its proper use. This applies to rentals as well as privately owned saws. BEFORE YOU START THE ENGINE, make sure the saw chain is not contacting any object. OPERATE THE CHAINSAW only in well ventilated areas.
PROPER CLOTHING FOR SAFETY Wear close-tting clothing. Always wear heavy, long trousers, boots, and gloves. Do not wear jewellery, shorts, sandals, or go barefoot. Do not wear loosetting clothing, which could be drawn into the engine or catch the chain or undergrowth. Wear overalls, jeans, or leggings made of cut-resistant material or ones that contain cut-resistant inserts. Secure hair so that it is above shoulder level. Wear non-slip safety footwear and heavy-duty gloves to improve your grip and to protect your hands. Wear eye, hearing, and head protection when operating this equipment. REFUELLING (DO NOT SMOKE!) To reduce the risk of re and burn injury, handle fuel with care. It is highly ammable. Mix and store fuel in a container approved for petrol. Mix fuel outdoors where there are no sparks or ames. Select bare ground, stop the engine, and allow it to cool before refuelling. Loosen the fuel cap slowly to release pressure and to keep fuel from escaping around the cap. Tighten the fuel cap securely after refuelling. Wipe spilled fuel from the unit. Move 15 m (50 ft.) away from refuelling site before starting engine. Never attempt to burn off spilled fuel under any circumstances. BASIC PRECAUTIONS IN THE CUTTING/ WORK AREA Do not operate a chainsaw in a tree. Do not cut from a ladder: this is extremely dangerous. Keep bystanders and animals out of the work area. Do not allow other persons to be nearby during starting or cutting with the chainsaw. NOTE: The size of the work area depends on the job being performed as well as the size tree or workpiece involved. For example, felling a tree requires a larger work area than making other cuts, i.e. bucking cuts etc. WARNING All chainsaw service, other than items in the operator s manual maintenance instructions, should be performed by competent chainsaw service personnel. If improper tools are used to remove the ywheel or clutch, or if an improper tool is used to hold the ywheel in order to remove the clutch, structural damage to the ywheel could occur which could subsequently cause the ywheel to burst and serious injury could result. KICK-BACK Kick-back is a dangerous reaction that can lead to serious injury. Do not rely only on the safety devices provided with your saw. As a chainsaw user, you must take special safety precautions to help keep your cutting jobs free from accident or injury. NOTE: Refer to Operation later in this manual for added information on kick-back and how to avoid serious personal injury. SAVE THIS MANUAL FOR FUTURE REFERENCE. PUSH AND PULL The reaction force is always opposite to the direction the chain is moving. Thus, the operator must be ready to control the PULL when cutting on the bottom edge of the bar and the PUSH when cutting along the top edge. NOTE: Your chainsaw has been fully factory tested. It is normal to nd some slight oil residue on the saw. MAINTENANCE PRECAUTIONS 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. If the saw chain moves at idling speed, the carburettor may need adjusting. Refer to Operation-Adjusting Idling Speed later in this manual. If the saw chain still moves at idling speed after adjustment has been made, contact a Ryobi service dealer for adjustment and discontinue use until the repair is made.

SYMBOLS

Some of the following symbols may be used on this tool. Please study them and learn their meaning. Proper interpretation of these symbols will allow you to operate the tool better and safer. SYMBOL NAME Safety Alert DESIGNATION / EXPLANATION Precautions that involve your safety. To reduce the risk of injury, user must read and understand operator s manual before using this product. Wear eye, hearing and head protection when operating this equipment.
Read The Operator s Manual
Wear Eye, Hearing, and Head Protection

No Smoking

No smoking, sparks, or open ame.

Operate With Two Hands

Hold and operate the saw properly with both hands.

One Handed

Do not operate the saw using only one hand.

Carbon Monoxide

Engines produce carbon monoxide which is an odorless, deadly poison. Do not operate in an enclosed area.

Kickback

DANGER! Beware of kickback.

Bar Nose Contact

Avoid bar nose contact.

Wear Gloves

Wear non-slip, heavy-duty protective gloves when handling the chain saw. Use unleaded petrol intended for motor vehicle use with an octane rating of 87 [(R + M)/2] or higher. This product is powered by 2-stroke cycle engine and requires pre-mixing petrol and 2-stroke oil. Keep all bystanders and animals at least 15m away.

Petrol and Oil

Keep Bystanders Away

SPECIFICATIONS

RCS-3535Ccc Weight - No bar, chain, fuel or oil 4.6 kg Fuel tank capacity 310 cm3 Oil tank capacity 210 cm3 Bar lengths 35 cm Usable cutting lengths 320 mm Carlton 14-10-N1-MHC UNB Bar type Chain pitch 9.53 mm (0.375 inch) Chain gauge 1.27 mm (0.05 inch) Chain type Carlton N1C-BL-M-52E SK Drive sprocket 6-tooth Engine displacement 35 cm3 Maximum engine power (ISO7293) 1.7 kW / 10000 min-1 Maximum engine speed with attachment 12000 min-1 Idling engine speed 2700 - 3100 min-1 Specic fuel consumption at maximum 435g/kwh engine power Sound pressure level(ISO22868) 103 dB(A) Sound power level (ISO22868) 113 dB(A) Vibration (ISO22867) - Front Handle 6.4 m/s2 - Rear Handle 7.0 m/s2 DESCRIPTION (Fig. 1) 1. Front hand guard / Chain Brake 2. Front handle 3. Cylinder cover 4. Primer bulb 5. Choke knob 6. Clutch cover 7. Bar mounting nuts 8. Guide bar 9. Low kickback saw chain RCS-4040Ccc 4.6 kg 310 cmcmcm 370 mm Carlton 16-10-N1-MHC UNB 9.53 mm (0.375 inch) 1.27 mm (0.05 inch) Carlton N1C-BL-M-57E SK 6-tooth 40.1 cm3 1.8 kW / 10000 min-min-- 3100 min-1 435g/kwh 103 dB(A) 113 dB(A) 6.4 m/s2 7.0 m/s2 RCS-4446Ccc 4.6 kg 310 cmcmcm 410 mm Carlton 18-10W-K1-HC-UNB 8.26 mm (0.325 inch) 1.27 mm (0.05 inch) Carlton K1L-BL-72E 7-tooth 44 cm3 1.9 kW / 9500 min-min-- 3100 min-1 435g/kwh 103 dB(A) 113 dB(A) 6.4 m/s2 7.0 m/s2

10. Starter / fan housing 11. Starter grip 12. Ignition switch 13. Trigger release 14. Rear handle 15. Throttle trigger 16. Chain oil cap 17. Fuel cap 18. Spiked bumper

ASSEMBLY

WARNING If any parts are damaged or missing do not operate this tool until the parts are replaced. Failure to heed this warning could result in serious personal injury. NOTE: The chain saw has been fully factory tested. It is normal to nd some slight oil residue on the saw. Read and remove all hang tags and store with the Operator s Manual. See Figure 34-43. Read the replacing the guide bar and chain section later in this manual.
WARNING Do not attempt to modify this tool or create accessories not recommended for use with this tool. Any such alteration or modication is misuse and could result in a hazardous condition leading to possible serious personal injury. 24

OPERATION

MIXING THE FUEL This product is powered by a 2-stroke engine and requires pre-mixing petrol and synthetic 2-stroke oil. Pre-mix unleaded petrol and synthetic 2-stroke engine oil in a clean container approved for petrol. This engine is certied to operate on unleaded petrol intended for motor vehicle use with an octane rating of 87 [(R + M) / 2] or higher. Do not use any type of pre-mixed petrol/oil from fuel service stations, This includes the pre-mixed petrol/oil intended for use in mopeds, motorcycles, etc. Use synthetic 2-stroke oil only. Mix 2% oil into the petrol. This is a 50:1 ratio. WARNING Do not use any attachments or accessories not recommended by the manufacturer of this tool. The use of attachments or accessories not recommended can result in serious personal injury. APPLICATIONS You may use this tool for the purposes listed below: Basic limbing, felling, and woodcutting Removing buttress roots FILLING THE FUEL TANK (Fig. 2) Clean surface around fuel cap to prevent contamination. Loosen the fuel cap slowly to release pressure and to keep fuel from escaping around the cap. Carefully pour the fuel mixture into the tank. Avoid spillage. Prior to replacing the fuel cap, clean and inspect the o-ring. Immediately replace the fuel cap and hand tighten. Wipe up any fuel spillage. Move 9 m (30 ft) away from refueling site before starting engine. NOTE: It is normal for the engine to emit smoke during and after the rst use. Mix the fuel thoroughly and alsoeach time before refueling. Mix in small quantities. Do not mix quantities larger than usable in a 30 day period. A synthetic 2-stroke oil containing a fuel stabilizer is recommended.
WARNING Do not allow familiarity with tools to make you careless. Remember that a careless fraction of a second is sufcient to inict serious injury. WARNING Always wear safety goggles or safety glasses with side shields when operating this tool. Failure to do so could result in objects being thrown into your eyes resulting in possible serious injury.

FUEL AND REFUELING HANDLING THE FUEL SAFELY WARNING Always shut off engine before fueling. Never add fuel to a machine with a running or hot engine. Move at least 9 m. from refueling site before starting the engine. DO NOT SMOKE! Failure to heed this warning can result in possible personal injury. WARNING Check for fuel leaks. If any are found, correct them before using the saw to prevent re or burn injury. Always handle fuel with care; it is highly ammable. Always refuel outdoors where there are no sparks and ames. Do not inhale fuel vapour. Do not let petrol or oil come in contact with skin. Keep petrol and oil away from the eyes. If petrol or oil comes in contact with the eyes, wash them immediately with clean water. If irritation is still present, see a doctor immediately. Clean up spilled fuel immediately. 25
ADDING BAR AND CHAIN OIL (Fig. 3) Use Ryobi Bar and Chain Oil. It is designed for chains and chain oilers, and is formulated to perform over a wide temperature range with no dilution required. Chain saw should use approximately one tank of oil per tank of fuel. NOTE: Do not use dirty, used, or otherwise contaminated oils. Damage may occur to the oil pump, bar, or chain. Carefully pour the bar and chain oil into the oil tank. Fill the oil tank every time you fuel the engine. OPERATING THE CHAIN BRAKE(Fig. 4-5) Check the operating condition of the chain brake prior to each use. Using the back of your left hand, engage the chain brake by pushing the chain brake lever/hand guard toward the bar while the chain is rotating rapidly. Reset the chain brake back into the RUN position by grasping the top of the chain brake lever/hand guard and pulling toward the front handle until you hear a click. WARNING If the chain brake does not stop the chain immediately, or if the chain brake will not stay in the run position without assistance, take the saw to an authorized service center for repair prior to use. To Start a Cold Engine: Set the ignition switch to the RUN ( I ) position. Make sure the chain brake is in the run position by pulling back on the lever/hand guard. Fully press and release the primer bulb 4 times. Pull choke knob all the way out to FULL CHOKE ( position. )
Pull the starter grip until the engine attempts to start, but no more than 5 times. Push choke knob to HALF CHOKE ( Pull starter grip until engine runs. NOTE: Allow the saw to run in this position 15-30 seconds, depending upon the temperature. Push the choke knob in to the RUN ( ) position. ) position.
CAUTION Failure to release partial throttle when chain brake lever is in the brake position will result in serious damage to the unit. Never squeeze and hold the throttle trigger while the chain brake is in the brake position. To Start a Warm Engine: Set the ignition switch to the RUN ( I ) position. Make sure the chain brake is in the run position by pulling back on the lever/hand guard. Fully press and release the primer bulb 4 times. Pull starter grip until engine runs.

STARTING THE ENGINE (Fig. 6 - 10) The starting method differs depending on whether the engine is cold or warm. WARNING Keep your body to the left of the chain line. Never straddle the saw or chain, or lean over past the chain line. Place the chain saw on level ground and ensure that no objects or obstructions are in the immediate vicinity that could come in contact with the bar and chain. To prevent rapid dulling of the chain, do not allow the bar and chain to contact dirt on the ground. Hold the front handle rmly with your left hand and put your right foot onto the base of the rear handle. 26
STOPPING THE ENGINE ( FIG. 11 - 12) Release the throttle trigger and let the engine return to idle. To stop the engine, move the ignition switch to the STOP ( ) position. Do not put the chain saw on the ground when the chain is still moving. For additional safety, set the chain brake when the saw is not in use. In the event that the ignition switch will not stop the saw, pull the choke knob out to the fully extended position (FULL ) and engage chain brake to stop the engine. CHOKE / If the ignition switch will not stop the saw when set to the STOP position, have the ignition switch repaired before using the chain saw again to prevent unsafe conditions or serious injury. NOTE: When you are nished using the saw, always relieve tank pressure by loosening, then retightening, the chain oil and fuel mix caps. Allow the engine to cool before storing.
ADJUSTING IDLE SPEED (Fig. 13) If the engine starts, runs, and accelerates, but will not idle, turn the idle speed screw T clockwise to increase idle speed. If the chain turns at idle, turn the idle speed screw T counterclockwise to reduce the idle RPM and stop the chain movement. If the saw chain still moves at idle speed, contact an authorized service center for adjustment and discontinue use until the repair is made. WARNING THE SAW CHAIN SHOULD NEVER TURN AT IDLE. Turn the idle speed screw T counterclockwise to reduce the idle RPM and stop the chain, or contact an authorized service center for adjustment and discontinue use until the repair is made. Serious personal injury may result from the saw chain turning at idle. PREPARING FOR CUTTING PROPER GRIP ON HANDLES (Fig. 17) WARNING Never use a left-handed (cross-handed) grip or any stance that would place your body or arm across the chain line. WARNING DO NOT operate the throttle trigger with your left hand and hold the front handle with your right hand. Never allow any part of your body to be in the chain line while operating a saw.

BASIC OPERATING/CUTTING PROCEDURES Practice cutting a few small logs using the following technique to get the feel of using the saw before you begin a major sawing operation. Take the proper stance in front of the wood with the saw idling. Accelerate the engine to full throttle just before entering the cut by squeezing the throttle trigger. Begin cutting with the saw against the log. Keep the engine at full throttle the entire time you are cutting. Allow the chain to cut for you; exert only light downward pressure. Forcing the cut could result in damage to the bar, chain, or engine. Release the throttle trigger as soon as the cut is completed allowing the engine to idle. Running the saw at full throttle without a cutting load can result in unnecessary wear to the chain, bar, and engine. Do not put pressure on the saw at the end of the cut. Periodically glance at the top of the tree during the back-cut to assure the tree is going to fall in the desired direction. Keep all bystanders at a safe distance (G) (at least twice the height of the tree). Prepare a path of safe retreat (H). If the tree starts to fall in the wrong direction, or if the saw gets caught or hung up during the fall, leave the saw and save yourself! Consider the wind direction before felling a tree. Do not fell trees near power lines or near buildings which could be struck by falling limbs or the tree itself. The chainsaw operator should keep on the uphill side of the terrain as the tree is likely to roll or slide downhill after it is felled. Remove dirt, stones, loose bark, nails, staples, and wire from the tree where felling cuts are to be made. WARNING Do NOT fell trees near power lines or near buildings which could be struck by falling limbs or the tree itself.
FELLING TREES HAZARDOUS CONDITIONS (Fig. 20) WARNING Do not fell trees during periods of high wind or heavy precipitation. Wait until the hazardous weather has ended. When felling a tree, it is important that you heed the following warnings to prevent possible serious injury. Wear eye, hearing, and head protection (A) when operating this equipment. Do not cut down trees having an extreme lean or large trees with rotten or dead limbs, loose bark, or hollow trunks. Have these trees pushed or dragged down with heavy equipment, then cut them up. Consider the distribution and weight of heavy limbs (B). Clear out the undergrowth around the tree to be felled (C). Do not cut trees near electrical wires or buildings (D). Consider the direction in which the tree leans (E). Check the tree for damaged or dead branches which could fall and hit you during felling (F). 4. 3. 2.
PROPER PROCEDURE FOR TREE FELLING (Fig. 21 - 24) 1. Pick your escape route (or routes in case the intended route is blocked). Clear the immediate area around the tree and make sure there are no obstructions in your planned path of retreat. Clear the path of safe retreat approximately 135 from the planned line of fall (A). Consider the force and direction of the wind, the lean and balance of the tree, and the location of large limbs. These things inuence the direction in which the tree will fall. Do not try to fell a tree along a line different from its natural line of fall (B). Cut a notch about 1/3 the diameter of the trunk in the side of the tree (C). Make the notch cuts so they intersect at right angles to the line of fall. This notch should be cleaned out to leave a straight line. To keep the weight of the wood off the saw, always make the lower cut of the notch before the upper cut. Make the back-cut (D) level and horizontal, and at a minimum of 5 cm above the horizontal cut of the notch.

NOTE: Never cut through to the notch. Always leave a band of wood between the notch and back cut (approximately 5 cm or 1/10 the diameter of the tree). This is called a hinge or hingewood (E). It controls the fall of the tree and prevents slipping or twisting or shoot-back of the tree off the stump. On large diameter trees, stop the back cut before it is deep enough for the tree to either fall or settle back on the stump. Then insert soft wooden or plastic wedges (F) into the cut so they do not touch the chain. Drive wedges in, little by little, to help jack the tree over. 5. As tree starts to fall, stop the chainsaw and put it down immediately. Retreat along the cleared path, but watch the action in case something falls your way. WARNING Never cut through to the notch when making a back cut. The hinge controls the fall of the tree: this is the section of wood between the notch and back-cut. BUCKING WITH A WEDGE (Fig. 27) If the wood diameter is large enough for you to insert a soft bucking wedge (B) without touching the chain, you should use the wedge to hold the cut open to prevent pinching. BUCKING LOGS UNDER STRESS (Fig. 28) (C) LOG SUPPORTED AT ONE END. (D) LOG SUPPORTED AT BOTH ENDS. Make the rst bucking cut (E) 1/3 of the way through the log and nish with a 2/3 cut (F) on the opposite side. As you cut the log, it will tend to bend. The saw can become pinched or hung in the log if you make the rst cut deeper than 1/3 of the diameter of the log. Give special attention to logs under stress (G) to prevent the bar and chain from pinching. OVERBUCKING (Fig. 29) Begin on the top side of the log with the bottom of the saw against the log; exert light pressure downward. Note that the saw will tend to pull away from you. UNDERBUCKING (Fig. 30) Begin on the under side of the log with the top of the saw against the log; exert light pressure upward. During underbucking, the saw will tend to push back at you. Be prepared for this reaction and hold the saw rmly to maintain control. LIMBING AND PRUNING (Fig. 31 - 32) Work slowly, keeping both hands on the saw with a rm grip. Maintain secure footing and balance. Keep the tree between you and the chain while limbing. Cut from the side of the tree opposite the branch you are cutting. Do not cut from a ladder: this is extremely dangerous. Leave this operation for professionals. Do not cut above chest height as a saw held higher is difcult to control against kick-back. WARNING Never climb into a tree to limb or prune. Do not stand on ladders, platforms, a log, or in any position which may cause you to lose your balance or control of the saw.

REMOVING BUTTRESS ROOTS (Fig. 25) A buttress root is a large root extending from the trunk of the tree above the ground. Remove large buttress roots prior to felling. Make the horizontal cut (A) into the buttress rst, followed by the vertical cut (B). Remove the resulting loose section (C) from the work area. Follow the correct tree felling procedure after you have removed the large buttress roots. Refer to Operation Proper Procedure for Tree Felling earlier in this manual. BUCKING (Fig. 26) Bucking is the term used for cutting a fallen tree to the desired log length. Cut only one log at a time. Support small logs on a sawing stand or another log while bucking. Keep a clear cutting area. Make sure that no objects can contact the guide bar nose and chain during cutting: this can cause kick-back (A). During bucking operations, stand on the uphill side so that the cut-off section of the log cannot roll over you. Sometimes it is impossible to avoid pinching (with just standard cutting techniques) or difcult to predict which way a log will settle when cut.
When pruning trees it is important not to make the ush cut next to the main limb or trunk until you have cut off the limb further out to reduce the weight. This prevents stripping the bark from the main member. 1. Underbuck the branch 1/3 through for your rst cut (A). 2. Overbuck the branch to drop it (B). 3. Finish by cutting smoothly and neatly against the main member (C) so the bark will grow back to seal the wound. WARNING If the limbs to be pruned are above chest height, hire a professional to perform the pruning. CUTTING SPRING POLES (Fig. 33) A spring pole (A) is any log, branch, rooted stump, or sapling which is bent under tension by other wood so that it springs back if the wood holding it is cut or removed. On a fallen tree, a rooted stump has a high potential of springing back to the upright position during the bucking cut to separate the log from the stump. Watch out for spring-poles; they are dangerous. WARNING Spring poles are dangerous and could strike the operator causing the operator to lose control of the chainsaw. This could result in severe or fatal injury to the operator. WARNING Do not at any time let brake uids, petrol, petroleumbased products, penetrating oils, etc., come in contact with plastic parts. Chemicals can damage, weaken or destroy plastic which may result in serious personal injury. LUBRICATION All of the bearings in this tool are lubricated with a sufcient amount of high grade lubricant for the life of the unit under normal operating conditions. Therefore, no further lubrication is required. REPLACING THE GUIDE BAR AND CHAIN (Fig. 34 - 43) DANGER Never start the engine before installing the guide bar, chain, drivecase cover, and clutch drum. Without all these parts in place, the clutch can y off or explode, exposing the user to possible serious injury. WARNING To avoid serious personal injury, read and understand all the safety instructions in this section. Always place the switch in the STOP before you work on the saw. position

Make sure the chain brake is not set by pulling the chain brake lever/hand guard towards the front handle to the run position. NOTE: When replacing the guide bar and chain, always use the specied bar and chain. Wear gloves when handling the chain and bar. These components are sharp and may contain burrs. Remove the bar mounting nuts using the combination wrench provided. Remove the clutch cover. Remove the bar and chain from the mounting surface. Remove the old chain from the bar. Lay out the new saw chain in a loop and straighten any kinks. The cutters (A) should face in the direction of chain rotation (B). If they face backwards, turn the loop over. Place the chain drive links (C) into the bar groove (D) as shown. 30

MAINTENANCE

WARNING When servicing, use only identical Ryobi replacement parts. Use of any other parts may create a hazard or cause product damage. WARNING Always wear safety goggles or safety glasses with side shields during power tool operation or when blowing dust. If operation is dusty, also wear a dust mask. GENERAL MAINTENANCE Avoid using solvents when cleaning plastic parts. Most plastics are susceptible to damage from various types of commercial solvents and may be damaged by their use. Use clean cloths to remove dirt, dust, oil, grease, etc.
Position the chain so there is a loop at the back of the bar. Hold the chain in position on the bar and place the loop around the sprocket (E). Fit the bar ush against the mounting surface so that the bar studs are in the long slot of the bar. NOTE: When placing the bar on the bar studs (F), ensure that the adjusting pin (G) is in the chain tension pin hole (H). Replace the clutch cover (I) and bar mounting nuts (J). Finger-tighten the bar mounting nuts. The bar must be free to move for tension adjustment. Remove all slack from the chain by turning the chain tensioning screw (K) clockwise until the chain seats snugly against the bar with the drive links in the bar groove. Lift the tip of the guide bar up to check for sag. Release the tip of the guide bar and turn the chain tensioning screw 1/2 turn clockwise. Repeat this process until sag does not exist. Hold the tip of the guide bar up and tighten the bar mounting nuts securely. The chain is correctly tensioned when there is no sag on the underside of the guide bar, the chain is snug, but it can be turned by hand without binding. Ensure that the chain brake is not set. NOTE: If chain is too tight, it will not rotate. Loosen the bar nuts slightly and turn the tension adjuster 1/4 turn counterclockwise. Lift the tip of the guide bar up and retighten the bar nuts securely. Ensure that the chain will rotate without binding. ADJUSTING THE CHAIN TENSION (Fig. 44 - 46) WARNING Never touch or adjust the chain while the motor is running. The saw chain is very sharp. Always wear protective gloves when performing maintenance on the chain. Stop the engine before setting the chain tension. Make sure the bar mounting nuts are loosened to nger tight. Turn the chain tensioning screw clockwise to tension the chain. NOTE: A cold chain is correctly tensioned when there 31 is no slack on the underside of the guide bar, the chain is snug, and it can be turned by hand without binding. Retension the chain whenever the ats on the drive links (A) hang out of the bar groove. NOTE: During normal saw operation, the temperature of the chain increases. The drive links of a correctly tensioned warm chain will hang approximately 1.25 mm. out of the bar groove. The tip of the combination wrench can be used as a guide to help determine the correct warm chain tension. NOTE: New chains tend to stretch; check the chain tension frequently and tension as required. CAUTION A chain tensioned while warm may be too tight upon cooling. Check the cold tension before next use. CHAIN MAINTENANCE (Fig. 47 - 48) CAUTION Check that the switch is in the STOP before you work on the saw. position

Use only a low-kickback chain on this saw. This fastcutting chain provides kickback reduction when properly maintained. For smooth and fast cutting, maintain the chain properly. The chain requires sharpening when the wood chips are small and powdery, the chain must be forced through the wood during cutting, or the chain cuts to one side. During maintenance of the chain, consider the following: Improper ling angle of the side plate can increase the risk of severe kickback. Raker (depth gauge) clearance (A). Too low increases the potential for kickback. Not low enough decreases cutting ability. If the cutter teeth hit hard objects such as nails and stones, or are abraded by mud or sand on the wood, have an authorized service center sharpen the chain. NOTE: Inspect the drive sprocket (B) for wear or damage when replacing the chain. If signs of wear or damage are present in the areas indicated, have the drive sprocket replaced by an authorized service center. NOTE: If you do not fully understand the correct procedure for sharpening the chain after reading the instructions that follow, have the saw chain sharpened by an authorized service center or replace with a recommended low-kickback chain.
SHARPENING THE CUTTERS (Fig. 49 - 52) Parts of a cutter: (A) Cutting corner (D) Toe (G) Rivet hole (B) Side plate (C) Depth gauge (E) Gullet (H) Top plate SIDE PLATE ANGLE (Fig. 54) (D) CORRECT 80 Produced automatically if you use the correct diameter le in the le holder. (E) WARNING The saw chain is very sharp. Always wear protective gloves when performing maintenance to the chain to prevent serious personal injury. Tension the chain prior to sharpening. Refer to Adjusting The Chain Tension. Use a 1.6 mm diameter round le and holder (not provided). Do all of your ling at the midpoint of the bar. Keep the le level with the top plate of the tooth. Do not let the le dip or rock. Using light but rm pressure. Stroke towards the front corner of the tooth. Lift the le away from the steel on each return stroke. Put a few rm strokes on every tooth. File all left hand cutters (A) in one direction. Then move to the other side and le the right hand cutters (B) in the opposite direction. Remove lings from the le with a wire brush. CAUTION A dull or improperly sharpened chain can cause excessive engine speed during cutting, which may result in severe engine damage. WARNING Improper chain sharpening increases the potential of kickback. WARNING Failure to replace or repair a damaged chain can cause serious injury. HOOK Grabs and dulls quickly; increases the potential of KICKBACK. Results from using a le with a diameter too small or a le held too low. BACKWARD SLOPE Needs too much feed pressure; causes excessive wear to the bar and chain. Results from using a le with a diameter too large or le held too high. (F) Heel TOP PLATE FILING ANGLE (Fig. 53) (A) CORRECT 30 le holders are marked with guide marks to align le properly to produce correct top plate angle. (B) (C) LESS THAN 30 for cross cutting. MORE THAN 30 feathered edge dulls quickly.

CHECKING THE FUEL FILTER (Fig. 68) Check the fuel filter (B) periodically. Replace it if contaminated or damaged.
REPLACING THE SPARK PLUG (Fig. 69) This engine uses a Champion RZ7C or NGK CMR7H spark plug with 0,64 mm electrode gap. Use an exact replacement and replace every 50 hours or more frequently, if necessary. Loosen the spark plug by turning it counterclockwise with a wrench (A). Remove the spark plug. Hand thread the new spark plug, turning it clockwise. Tighten securely with wrench (B). NOTE: Be careful not to cross-thread the spark plug. Cross-threading will seriously damage the cylinder.
Drain all bar and chain oil from tank into a container approved for oil. Clean all foreign material from the saw. Store it in a well-ventilated place that is inaccessible to children. NOTE: Keep away from corrosive agents such as garden chemicals and de-icing salts. Abide by local regulations for the safe storage and handling of gasoline. Excess fuel should be used in other 2-cycle engine powered equipment.

TROUBLESHOOTING

Problem Engine will not start. [Make sure ignition switch is in the RUN ( l ) position.] Possible Cause No spark. Solution Check spark. Remove air lter cover. Remove spark plug from cylinder. Reattach the spark plug wire and lay spark plug on top of cylinder with the metal part of plug touching the cylinder. Pull the starter grip and watch for spark at spark plug tip. If there is no spark, repeat test with a new spark plug. With the ignition switch OFF, remove spark plug. Move choke knob to RUN position (pushed in completely) and pull starter grip 15 to 20 times. This will clear excess fuel from engine. Clean and reinstall spark plug. Set ignition switch to RUN ( l ) position. Push and fully release primer bulb 4 times. Pull starter three times with choke knob at RUN. If engine does not start, move choke knob to HALF CHOKE and repeat normal starting procedure. If engine still fails to start, repeat procedure with a new spark plug. Contact an authorized service center for carburetor adjustment. Contact an authorized service center for carburetor adjustment. Contact an authorized service center for carburetor adjustment. Use fresh fuel and the correct 2-stroke oil mix ratio. Clean air lter. Refer to Cleaning the Air Cleaner in the Maintenance section of this manual. Clean spark arrestor screen. Refer to Cleaning the Spark Arresting Screen in the Maintenance section of this manual. Contact an authorized service center for carburetor adjustment.