OPERATOR’S MANUAL RY10520 / 20 in. 46cc Chain Saw RY10518 / 18 in. 46cc Chain Saw (ALL VERSIONS) ENGINE/EVAP. FAMILY: *HCPS.0464AC Your chain saw has been engineered and manufactured to Ryobi’s high standard for dependability, ease of operation, and operator safety. When properly cared for, it will give you years of rugged, trouble-free performance. WARNING: To reduce the risk of injury, the user must read and understand the operator’s manual before using this product.
TABLE OF CONTENTS TABLE DES MATIÈRES / ÍNDICE DE CONTENIDO Introduction........................................................................................................................................2 Introduction / Introducción General Safety Rules...................................................................................................................... 3-4 Règles de sécurité générales / Reglas de seguridad generales Specific Safety Rules..........................................
GENERAL SAFETY RULES WARNING: Read and understand all instructions. Failure to follow all instructions listed below, may result in electric shock, fire and/or serious personal injury. READ ALL INSTRUCTIONS Know your tool. Read the operator’s manual carefully. Learn the saw’s applications and limitations as well as the specific potential hazards related to this tool.
GENERAL SAFETY RULES guide bar and saw chain to the rear, and the muffler away from your body. When transporting the chain saw, use the appropriate guide bar scabbard. Do not operate a chain saw 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. Shut off the engine before setting the chain saw down. Do not leave the engine running unattended.
SPECIFIC SAFETY RULES Before you start the engine, make sure the saw chain is not contacting any object. Wear snug-fitting clothing. Always wear heavy, long pants, boots, and gloves. Do not wear jewelry, short pants, sandals, or go barefoot. Do not wear loose fitting clothing, which could be drawn into the engine or catch the chain or underbrush. Wear overalls, jeans, or chaps made of cut-resistant material or ones that contain cut-resistant inserts. Secure hair so that it is above shoulder level.
SYMBOLS Some of the following symbols may be used on this product. Please study them and learn their meaning. Proper interpretation of these symbols will allow you to operate the product better and safer. SYMBOL NAME DESIGNATION/EXPLANATION Safety Alert Indicates a potential personal injury hazard. Read Operator’s Manual To reduce the risk of injury, user must read and understand operator’s manual before using this product.
SYMBOLS The following signal words and meanings are intended to explain the levels of risk associated with this product. SYMBOL SIGNAL MEANING DANGER: Indicates an imminently hazardous situation, which, if not avoided, will result in death or serious injury. WARNING: Indicates a potentially hazardous situation, which, if not avoided, could result in death or serious injury. CAUTION: Indicates a potentially hazardous situation, which, if not avoided, may result in minor or moderate injury.
GLOSSARY OF TERMS Bucking The process of cross cutting a felled tree or log into lengths. Chain Brake A device used to stop the saw chain. Chain Saw Power Head A chain saw without the saw chain and guide bar. Clutch A mechanism for connecting and disconnecting a driven member to and from a rotating source of power. Drive Sprocket or Sprocket The toothed part that drives the saw chain. Felling The process of cutting down a tree.
FEATURES PRODUCT SPECIFICATIONS Bar length: RY10520.................................................. 20 in. RY10518.................................................. 18 in. Chain pitch.............................................. .325 in. Chain gauge............................................ .050 in. Chain type............................................. Standard Drive sprocket.......................................... 7-tooth Engine displacement.................................... 46cc Engine power..
FEATURES STARTER GRIP REAR HANDLE STARTER/FAN HOUSING FUEL CAP IGNITION SWITCH THROTTLE TRIGGER Fig. 1b KNOW YOUR CHAIN SAW See Figures 1a - 1b. The safe use of this product requires an understanding of the information on the product and in this operator’s manual as well as a knowledge of the project you are attempting. Before use of this product, familiarize yourself with all operating features and safety rules. CHOKE LEVER The choke lever opens and closes the choke valve in the carburetor.
ASSEMBLY UNPACKING PACKING LIST This product has been shipped completely assembled. n Carefully remove the product and any accessories from the box. Make sure that all items listed in the packing list are included. Chain Saw Scabbard Combination Wrench 2-Cycle Engine Lubricant Case Operator’s Manual WARNING: Do not use this product if it is not completely assembled or if any parts appear to be missing or damaged.
OPERATION WARNING: Always shut off engine before fueling. Never add fuel to a machine with a running or hot engine. Move at least 30 ft. from refueling site before starting the engine. DO NOT SMOKE! Stay away from open flames or sparks. Failure to heed this warning could result in serious personal injury. FUEL AND REFUELING HANDLING THE FUEL SAFELY WARNING: Check for fuel leaks. If any are found, correct them before using the saw to prevent fire or burn injury.
OPERATION FILLING THE FUEL TANK See Figure 2. n Clean the surface around the fuel cap to prevent contamination. n Loosen the fuel cap slowly. n Carefully pour the fuel mixture into the tank. Avoid spillage. n Prior to replacing the fuel cap, clean and inspect the o-ring. n Immediately replace the fuel cap and hand tighten. Wipe up any fuel spillage. NOTE: It is normal for the engine to emit smoke during and after the first use. ADDING BAR AND CHAIN LUBRICANT See Figure 3.
OPERATION OPERATING THE CHAIN BRAKE BRAKE POSITION See Figures 4 - 5. Check the operating condition of the chain brake prior to each use. n Engage the chain brake by rotating your left hand around the front handle, allowing the back of your hand to push the chain brake lever/hand guard toward the bar while the chain is rotating rapidly. Be sure to maintain both hands on the saw handles at all times.
OPERATION below 50°F, pull the starter grip until the engine attempts to start, but no more than 5 times. n Push choke lever to RUN position. n Pull starter grip until engine runs. NOTE: Allow the saw to run in this position 15-30 seconds, depending upon the temperature. n Depress the trigger release and squeeze and release the throttle trigger to return the engine to idle after a total run time of at least 30 seconds. RUN POSITION Fig.
OPERATION STOPPING THE ENGINE See Figures 12 - 13. Release the throttle trigger and let the engine return to idle. To stop the engine, move the ignition switch to the STOP ( O ) 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 lever out to the fully extended position (FULL CHOKE ) and engage chain brake to stop the engine.
OPERATION 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. PULL PULL AND PUSH See Figure 15. The reaction force of the saw is always opposite to the direction the chain is moving.
OPERATION KICKBACK PRECAUTIONS KICKBACK DANGER ZONE See Figures 16 - 17. Rotational kickback occurs when the moving chain contacts an object at the Kickback Danger Zone of the guide bar. The result is a lightning-fast reverse reaction, which kicks the guide bar up and back towards the operator. This reaction can cause loss of control, which can result in serious injury. Fig. 16 ROTATIONAL KICKBACK PREPARING FOR CUTTING PROPER GRIP ON HANDLES See Figure 18.
OPERATION PROPER CUTTING STANCE See Figure 19. THUMB ON UNDERSIDE OF HANDLE BAR WARNING: CHAIN LINE STRAIGHT ARM Alway use the proper cutting stance described in this section. Never kneel when using the chain saw except when felling a tree as shown in figure 24. Kneeling could result in loss of stability and control of the saw resulting in serious personal injury. n Balance your weight with both feet on solid ground.
OPERATION the saw at full throttle without a cutting load can result in unnecessary wear to the chain, bar, and engine. n Do not put pressure on the saw at the end of the cut. PLANNED LINE OF FALL FELLING TREES HAZARDOUS CONDITIONS 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.
OPERATION n Cut a notch about 1/3 the diameter of the trunk in the side of the tree. Make the notch cuts so they intersect at a right angle 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. n Make the backcut level and horizontal, and at a minimum of 2 in. above the horizontal cut of the notch. NOTE: Never cut through to the notch.
OPERATION work area. Follow the correct tree felling procedure as stated in Proper Procedure For Tree Felling after you have removed the large buttress roots. KICKBACK BUCKING See Figure 26. Bucking is the term used for cutting a fallen tree to the desired log length. n Cut only one log at a time. n Support small logs on a saw horse or another log while bucking. n Keep a clear cutting area. Make sure that no objects can contact the guide bar nose and chain during cutting, this can cause kickback.
OPERATION BUCKING LOGS UNDER STRESS LOG SUPPORTED AT ONE END See Figure 28. Make the first bucking cut 1/3 of the way through the log and finish with a 2/3 cut 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 first cut deeper than 1/3 of the diameter of the log. Give special attention to logs under stress to prevent the bar and chain from pinching.
OPERATION LIMBING AND PRUNING See Figures 31 - 32. n Work slowly, keeping both hands on the saw with a firm grip. Maintain secure footing and balance. n Keep the tree between you and the chain while limbing. n Do not cut from a ladder. This is extremely dangerous. Leave this operation for professionals. n Do not cut above chest height. A saw held higher than chest height is difficult to control against kickback. LOAD SECOND CUT FIRST CUT 1/3 DIAMETER FINISHING CUT Fig.
MAINTENANCE WARNING: RUN POSITION When servicing, use only identical replacement parts. Use of any other parts may create a hazard or cause product damage. WARNING: Always wear eye protection with side shields marked to comply with ANSI Z87.1, along with hearing and head protection. Failure to do so could result in objects being thrown into your eyes and other possible serious injuries. Fig. 34 GENERAL MAINTENANCE Avoid using solvents when cleaning plastic parts.
MAINTENANCE n Always place the switch in the STOP “ O ” position before you work on the saw. n 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 specified bar and chain listed in the Bar and Chain Combinations section later in this manual. n Wear gloves when handling the chain and bar. These components are sharp and may contain burrs.
MAINTENANCE n Replace the clutch cover and bar mounting nuts. n Fingertighten the bar mounting nuts. The bar must be free to move for tension adjustment. n Remove all slack from the chain by turning the chain tensioning screw clockwise until the chain seats snugly against the bar with the drive links in the bar groove. n Lift the tip of the guide bar up to check for sag. n 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.
MAINTENANCE ADJUSTING THE CHAIN TENSION See Figures 44 - 46. WARNING: Never touch or adjust the chain while the engine is running. The saw chain is very sharp. Always wear protective gloves when performing maintenance on the chain. n Stop the engine before setting the chain tension. n Make sure the bar mounting nuts are loosened to finger tight. n Turn the chain tensioning screw clockwise to tension the chain.
MAINTENANCE CHAIN MAINTENANCE See Figures 47 - 48. CAUTION: Check that the switch is in the STOP “ O ” position before you work on the saw. Use only a low-kickback chain on this saw. This fast- cutting 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.
MAINTENANCE SHARPENING THE CUTTERS See Figures 49 - 52. Be careful to file all cutters to the specified angles and to the same length, as fast cutting can only be obtained when all cutters are uniform. CUTTING CORNER SIDE PLATE TOP PLATE DEPTH GAUGE RIVET HOLE WARNING: HEEL The saw chain is very sharp. Always wear protective gloves when performing maintenance to the chain to prevent serious personal injury. TOE GULLET n Tension the chain prior to sharpening. Refer to Adjusting The Chain Tension.
MAINTENANCE TOP PLATE FILING ANGLE See Figure 53. n CORRECT 30° – file holders are marked with guide marks to align file properly to produce correct top plate angle. n LESS THAN 30° – for cross cutting. n MORE THAN 30° – feathered edge dulls quickly. SIDE PLATE ANGLE See Figure 54. n CORRECT 80° – Produced automatically if you use the correct diameter file in the file holder. n HOOK – “Grabs” and dulls quickly; increases the potential of KICKBACK.
MAINTENANCE MAINTAINING THE GUIDE BAR See Figure 58. CAUTION: LUBRICATING HOLE Make sure the chain has stopped before you do any work on the saw. Every week of use, reverse the guide bar on the saw to distribute the wear for maximum bar life. The bar should be cleaned every day of use and checked for wear and damage. Feathering or burring of the bar rails is a normal process of bar wear. Such faults should be smoothed with a file as soon as they occur.
MAINTENANCE Use the following instructions to tighten the mounting screw of the nose guard. These are specially hardened screws. If you cannot install the screw tightly, replace both the screw and the SAFE-T-TIP® before further operation. NOTE: Do not replace the screw with an ordinary screw. Use only identical replacement parts from the manufacturer when replacing parts.
MAINTENANCE n Clean the pre-filter every 5 hours of use or sooner, if required. Remove the cylinder cover, starter assembly, and the fan housing baffle for access to the pre-filter in the engine housing. NOTE: If you use an air hose for drying, blow through both sides of filter. AIR FILTER CAUTION: Make sure the air filter is correctly placed in the air filter cover before reassembly. Never run the engine without the air filter, serious damage could result. Fig.
MAINTENANCE CLEANING THE ENGINE See Figures 67 - 68. Clean the cylinder fins and flywheel fins with compressed air or a brush periodically. Dangerous overheating of the engine may occur due to impurities on the cylinder. CLEAN CYLINDER FINS WARNING Never run the saw without all the parts, including the clutch cover and starter housing, securely in place.
MAINTENANCE SPARK ARRESTOR The spark arrestor must be cleaned or replaced every 50 hours or yearly to ensure proper performance of your product. Spark arrestors may be in different locations depending on the model purchased. Please contact your nearest service dealer for the location of the spark arrestor for your model. CHAIN CATCHER INSPECTING AND CLEANING CHAIN BRAKE See Figures 71 - 72. n Remove the clutch cover and clean the chain brake components.
MAINTENANCE EMISSIONS MAINTENANCE SCHEDULE Emissions Parts Inspect Before Each Use Clean Every 5 Hours Replace Every 25 Hours or Yearly Clean Every 25 Hours or Yearly Replace Every 50 Hours AIR FILTER ASSY includes: Filter Screen....................................................... X.............................X CARBURETOR ASSY includes: Heat Dam Gaskets FUEL TANK ASSY includes: Fuel Lines............................. X Fuel Cap...............................
BAR AND CHAIN COMBINATIONS Chain specifications: 0.0325 pitch, .05 in. chain gauge Length of Bar Guide Bar Part Number 20 in. 310629001 18 in. 310628001 Chain Part Number 900920027 901430001 Drive Links 78 link 72 link TROUBLESHOOTING Problem Possible Cause Engine will not No spark. start. [Make sure ignition switch is in Engine is flooded. the RUN ( l ) position.] Solution Clean or replace spark plug. Reset spark plug gap. Refer to Spark Plug Replacement earlier in this manual.
TROUBLESHOOTING Problem Possible Cause Solution Engine starts, runs, Carburetor requires and accelerates adjustment to idle speed. but will not idle. Turn idle speed screw “T” clockwise to increase idle speed. Refer to Adjusting the Carburetor in the Maintenance section of this manual. Carburetor requires adjustment to idle speed. Turn idle speed screw “T” counterclockwise to decrease speed. Refer to Adjusting the Carburetor in the Maintenance section of this manual. Air leak in the intake system.
WARRANTY LIMITED WARRANTY STATEMENT Techtronic Industries North America, Inc., warrants to the original retail purchaser that this RYOBI® brand outdoor product is free from defect in material and workmanship and agrees to repair or replace, at Techtronic Industries North America, Inc.’s, discretion, any defective product free of charge within these time periods from the date of purchase.
WARRANTY THE FOLLOWING CALIFORNIA AIR RESOURCES BOARD (CARB) STATEMENT ONLY APPLIES TO MODEL NUMBERS REQUIRED TO MEET THE CARB REQUIREMENTS. TECHTRONIC INDUSTRIES NORTH AMERICA, INC., LIMITED WARRANTY STATEMENT FOR FEDERAL AND CALIFORNIA EMISSION CONTROL SYSTEMS NON-ROAD AND SMALL OFF-ROAD ENGINES YOUR WARRANTY RIGHTS AND OBLIGATIONS The U.S. Environmental Protection Agency (EPA), the California Air Resources Board (CARB), and Techtronic Industries North America, Inc.
