Operator’s Manual CS-7310P Chain Saw The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. Read and understand all provided literature before use. Failure to do so could result in serious injury. Note: This product complies with CAN ICES-2/NMB-2.
TABLE OF CONTENTS CS-7310P TABLE OF CONTENTS Introduction................................................................................................................. 3 Servicing Information.................................................................................................. 3 Parts/Serial Number........................................................................................... 3 Service ..............................................................................................
CS-7310P INTRODUCTION INTRODUCTION Specifications, descriptions and illustrative material in this literature are as accurate as known at the time of publication, but are subject to change without notice. Illustrations may include optional equipment and accessories, and may not include all standard equipment. Read and understand all provided literature. Literature contains specifications and information for safety, operation, maintenance, storage, and assembly specific to this product.
PACKING LIST CS-7310P Service Service of this product during the warranty period must be performed by an Authorized ECHO Service Dealer. For the name and address of the Authorized ECHO Service Dealer nearest you, ask your retailer or call: 1-800-432-ECHO (3246). Dealer information is also available on our Web Site www.echo-usa.com. When presenting your unit for Warranty service/ repairs, proof of purchase is required.
CS-7310P SAFETY SAFETY Rules For Safe Operation Kickback Safety Precautions for Chain Saw Users 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.
SAFETY 3. Make sure that the area in which you are 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. CS-7310P Linear kickback Pinch Kickback 4. Cut at high engine speeds. 5. Do not overreach or cut above shoulder height. 6. Follow manufacturer’s sharpening and maintenance instructions for the saw chain. 7.
CS-7310P SAFETY Do not allow the saw to tip forward in order to avoid damage to the chain. If the chain does not stop immediately, return the saw to your authorized dealer for repair. Note: • For practice, while cutting a small tree, push the lever forward to lock the brake. • Confirm that the brake works properly before each use. • If the chain brake is clogged with wood chips, function of the brake may deteriorate. Always keep the device clean.
SAFETY ANSI Standard B175.1 and CSA Z62.1.3 stipulate that the brake shall stop the chain 0.12 seconds at an engine speed of 13,500 r/min. It is the responsibility of the owner/ operator to ensure that the brake is serviced, adjusted and tested strictly in accordance with the instructions as detailed here in order to ensure that the brake performance is maintained in compliance with the Standards B175.1 and CSA Z62.1.3 CS-7310P 35 cm (14 in.
CS-7310P SAFETY Other Safety Precautions 1. Do not operate a chain saw with one hand! Serious injury to the operator, helpers, bystanders, or any combination of these persons may result from one-handed operation. A chain saw is intended for twohanded use. 2. Do not operate a chain saw when you are fatigued. 3. Use safety footwear, snug-fitting clothing and protective gloves. Wear eye, hearing, and head protection devices. 4. Use caution when handling fuel.
SAFETY CS-7310P 18. When transporting your chain saw, use the appropriate guide bar scabbard. 19. A spark arrestor muffler approved to SAE Standard J335 is standard on this chain saw to reduce the possibility of forest fires. Do not operate the chain saw with a loose or defective muffler. Do not remove the spark arrestor screen. 20. When using a chainsaw a fire extinguisher should be available. 21. When felling, keep at least 2 tree lengths between yourself and your fellow workers. 22.
CS-7310P SAFETY Moving parts can amputate fingers or cause severe injuries. Keep hands, clothing and loose objects away from all openings. ◆ ALWAYS stop engine, disconnect spark plug, and make sure all moving parts have come to a complete stop before removing obstructions, clearing debris, or servicing unit. ◆ DO NOT start or operate unit unless all guards and protective covers are properly assembled to unit. ◆ NEVER reach into any opening while the engine is running.
SAFETY CS-7310P Personal Condition and Safety Equipment Cancer and Reproductive Harm www.P65Warnings.ca.gov The muffler or catalytic muffler and surrounding cover may become extremely hot. Always keep clear of exhaust and muffler area, otherwise serious personal injury might occur. Users of this product risk injury to themselves and others if the unit is used improperly and/or safety precautions are not followed. Proper clothing and safety gear must be worn when operating unit.
CS-7310P SAFETY Hand Protection Wear sturdy, no-slip, rubber work gloves to improve your grip on the handles. Gloves also provide protection against cuts and scratches, cold environments, and reduce the transmission of machine vibration to your hands. Hearing/Ear Protection ECHO recommends wearing personal protective equipment whenever unit is used.
SAFETY CS-7310P The components of this machine generate an electromagnetic field during operation, which can interfere with some pacemakers. To reduce the risk of serious or fatal injury, persons with pacemakers should consult with their physician and the pacemaker manufacturer before operating this machine. In the absence of such information, ECHO does not recommend the use of this machine by anyone who has a pacemaker.
CS-7310P SAFETY Repetitive Stress Injuries (RSI) It is believed that overusing the muscles and tendons of the fingers, hands, arms, and shoulders may cause soreness, swelling, numbness, weakness, and extreme pain in those areas. Certain repetitive hand activities may put you at a high risk for developing a Repetitive Stress Injury (RSI). An extreme RSI condition is Carpal Tunnel Syndrome (CTS), which could occur when your wrist swells and squeezes a vital nerve that runs through the area.
SAFETY CS-7310P Do not operate this product indoors or in inadequately ventilated areas. Engine exhaust contains poisonous emissions and can cause serious injury or death. International Symbols Symbol Description WARNING! Read and follow all safety precautions in the instruction manual. Failure to follow instructions could result in serious personal injury.
CS-7310P Symbol SAFETY Description Symbol Description Chain Oiler Adjustment Chain Brake Operation Choke Control “COLD START” Position (Choke Closed) Purge Pump Choke Control “RUN” Position (Choke Open) STOP De-Compression Device STOP STOP / Momentary STOP Switch Note: Not all symbols will appear on your unit.
SAFETY CS-7310P Manual Safety Symbols and Important Information Throughout this manual and on the product itself, you will find safety alerts and helpful, informational messages preceded by symbols or key words. The following is an explanation of those symbols and key words and what they mean to you. The safety alert symbol accompanied by the word “DANGER” calls attention to an act or condition which WILL lead to serious personal injury or death if not avoided.
CS-7310P EMISSION CONTROL EMISSION CONTROL (EXHAUST & EVAPORATIVE) CARB And EPA Emissions Control Information The emission control system for the engine is EM (engine modification) and, if the second to last character of the Engine Family on the Emission Control Information label (sample below) is “B”, “C”, “K”, or “T”, the emission control system is EM and TWC (3-way catalyst). The fuel tank/fuel line emission control system is EVAP (evaporative emissions).
DESCRIPTION CS-7310P DESCRIPTION Locate the safety decal(s) on your unit. Make sure the decal(s) is legible and that you understand and follow the instructions on it. If a decal cannot be read, a new one can be ordered from your ECHO dealer. Safety label is for example only. Your label my appear slightly different. 20 1 11 2 9 14 4 7 5 6 8 12 3 10 11 11 15 19 18 20″20H0PS3872 72LPX72CQ 51.8 38.3 30.
CS-7310P DESCRIPTION 1. Chain Brake Lever / Front Hand Guard 2. Spark Arrestor Muffler Or Spark Arrestor Muffler With Catalyst 3. Guide Bar 4. Spiked Bumper 5. Chain Catcher 6 Chain Tension Adjuster 7. Chain Brake / Sprocket Guard 8. Rear Hand Guard 9. Choke Control Knob 10. Air Cleaner Cover 11. Cleaner Cover Screws 12. Spark Plug 13. Stop Switch 14. Throttle Trigger Lockout 15. Rear Handle - For The Right Hand 16. Throttle Trigger 17. Fuel Tank Cap 18.
DESCRIPTION CS-7310P Preparation For Use Saw chain is sharp! Always wear gloves when handling assembly, otherwise serious personal injury can result. Guide Bar and Saw Chain Installation / Removal 1. Remove air cleaner cover and disconnect spark plug lead. When removing sprocket guard, loosen each nut one full turn, then completely loosen each nut. If one nut remains tight while the other is fully loosened, nut will not remain captive 2. Loosen sprocket guard nuts (A) and remove sprocket guard (B).
CS-7310P 5. DESCRIPTION Mount guide bar on studs (E) and slide toward clutch drum (F) to make saw chain installation easier. Ensure chain tension adjuster pin (H) fits into the guide bar adjuster hole.. E E F H G 6. Install saw chain around sprocket and guide bar as shown, with cutters on top of guide bar facing forward. 7. Install sprocket guard over guide bar studs. Tighten sprocket guard nuts finger tight. 8. Adjust saw chain tension, as instructed in “Adjusting Chain Tension”. 9.
DESCRIPTION 3. CS-7310P Hold the bar nose up, and turn adjuster (I) clockwise until chain contacts underside of the bar. 4. Tighten nuts with the bar nose held up. 5. Pull the chain around the bar by hand. Loosen the adjustment if you feel tight spots. I Tighten guide bar nuts to 20-23 N•m (200 to 230 kgf•cm, 175-200 in•lbf). DO NOT over-tighten nuts. Damage to saw can result. 6. Assemble components in reverse order. 7. Keep chain properly tensioned at all times.
CS-7310P OPERATION OPERATION Fuel Diesel fuels and alternative fuels, such as E-15 (15% ethanol), E-85 (85% ethanol) or any fuels not meeting ECHO requirements are NOT approved for use in ECHO 2-stroke gasoline engines. Use of diesel or alternative fuels can cause performance problems, loss of power, overheating, fuel vapor lock, and unintended machine operation, including, but not limited to, improper clutch engagement.
OPERATION ◆ ◆ ◆ ◆ CS-7310P If swallowed, do not induce vomiting. CALL PHYSICIAN OR A POISON CONTROL CENTER IMMEDIATELY. WEAR SAFETY GLASSES when mixing or handling. AVOID repeated or prolonged skin contact. AVOID inhaling oil mists or vapors. ECHO branded 2-stroke oils may be mixed at 50:1 ratio for application in all ECHO engines sold in the past regardless of ratio specified in those manuals. Handling Fuel Fuel is VERY flammable.
CS-7310P OPERATION Mixing Instructions Stored fuel ages. Do not mix more fuel than you expect to use in 30 days, 90 days when a fuel stabilizer is added. 1. Fill an approved fuel container with half of the required amount of gasoline. 2. Add the proper amount of 2-stroke oil to gasoline. 3. Close container and shake to mix oil with gasoline. 4. Add remaining gasoline, close fuel container, and remix. Fuel to Oil Mix – 50:1 Ratio US Metric Gas Oil Gas Oil gal. fl.oz. L cc 1 2.
OPERATION CS-7310P Servicing Fuel and Oil When the fuel tank cap or oil tank cap is difficult to remove, pull the starter handle slowly, and use the starter handle to assist in removal of the cap. Chain Lubricant Proper lubrication of the chain while in operation reduces friction between the chain and the guide bar to a minimum and assures a longer service life. Note: Cap indication - Fuel/oil tanks are indicated by the following illustrations: • Use bar and chain oil of high quality for this purpose.
CS-7310P OPERATION Operation of this equipment may create sparks that can start fires around dry vegetation. This unit is equipped with a spark arrestor to prevent discharge of hot particles from the engine. Metal cutters can also create sparks if the cutter strikes rocks, metal, or other hard objects. Contact local fire authorities for laws or regulations regarding fire prevention requirements. Starting Cold Engine Make sure the bar and chain are free from any obstruction when starting the chain saw.
OPERATION 6. CS-7310P Pull choke control knob (C) all the way out (closed [ ] choke position). C ◆ ◆ ◆ After choke control knob is pulled and then knob is returned to original position, throttle remains slightly open (fast idle latch condition). The chain will attempt to move when engine is started with fast idle throttle latch engaged. Do not start engine before chain brake is locked. 7. Securely hold the chain saw and pull starter handle until first starting sound. 8.
CS-7310P OPERATION ◆ Use the fast idle throttle latch only in starting. Note: Do not increase engine speed while chain brake is locked. Severe brake damage will result. Starting Warm Engine Make sure the bar and chain are free from any obstruction when starting the chain saw. 1. Move chain brake lever fully FORWARD to LOCK chain brake before starting. 2. Confirm there is fuel and chain oil in the tanks. 3. Move stop switch (A) UP to “RUN” position. A 4. Press the decompression device (B). B 5.
OPERATION CS-7310P Note: If engine does not start after 5 pulls, use cold start procedure. Do not increase engine speed while chain brake is locked. Severe brake damage will result. Running The saw chain should not move at idle, otherwise serious personal injury can result. Note: If saw chain moves adjust carburetor according to “Carburetor Adjustment” instructions in this manual, or see your dealer. 1. After engine starts, allow it to return to idle and warm up before using. 2.
CS-7310P OPERATION Stopping 1. Release throttle trigger and allow engine to idle. 2. Move stop switch (A) DOWN to “STOP” position. A Note: If engine does not stop, pull choke control knob out fully to stop engine. Note: Return the unit to your authorized dealer to check and repair stop switch before starting the engine again. Checking Chain Tension Do not operate with a loose chain. Chain tension should be checked frequently during work and corrected as necessary.
OPERATION CS-7310P Cutting Instructions General ◆ ◆ ◆ This chain saw is designed for cutting wood. Do not cut metal, plastic or any non-wood material. Wear suitable hearing protection such as earmuffs or earplugs to protect against objectionable or uncomfortable loud noises. Do not let the tip of the bar touch anything while the engine is running. At cutting speed the chain is moving at a high rate of speed.
CS-7310P OPERATION Start the engine, see that it is running properly. Squeeze the trigger to open the throttle wide open and start the cut. If the chain is properly sharpened, the cutting should be relatively effortless. It is not necessary to press down hard to make the saw cut. Pushing the saw too hard will slow the engine and cutting will actually be more difficult. Sap from palm trees may corrode metal parts unless proper saw maintenance is performed.
OPERATION CS-7310P Felling The Tree A falling tree can seriously damage anything it may hit - a car, a house, a fence, a power line, or another tree. There are ways to make a tree fall where you want it, so first decide where that is! Before cutting, clear the area around the tree. You will need good footing while working and you should be able to work the saw without hitting any obstacles. Next, select a path of retreat.
CS-7310P OPERATION To fell big trees with a diameter exceeding twice the bar length, start 3 the notching cuts from one side and draw the saw through to the other 1 side of the notch. Start the back cut on one side of the tree, pivoting the saw through to form the desired 2 hinge on that side. Then remove the saw for the second cut. Insert the saw in the first cut, very carefully so as not to cause kickback. The final cut is made by drawing the saw forward in the cut to reach the hinge.
OPERATION CS-7310P Bucking Bucking is the sawing of a log or fallen tree into smaller pieces. There are a few basic rules which apply to all bucking operations. Uphill Position • Keep both hands on the handles at all times. • Support logs if possible. • When cutting on a slope or hillside, always stand uphill. Finish cut First cut Support Keep in mind that the wood is heavy and that it will bend and pinch the saw if improperly supported.
CS-7310P OPERATION Guide Bar Saw Chain 711 (28) 28H8PS3892 3/8” 73LPX92CQ 92 813(32) 32H8PS3805 3/8” 73LPX105CQ 105 Only use saw chain designated as, “LOW-KICKBACK,” that meets ANSI B175.1 or CSA Z62.1, .3 Standard when tested on the representative sample of chain saws below 3.8 C.I.D., and Echo guide bar specified. Chain and guide bar gauge size must be identical. Use Bar/Chain combinations shown in table above.
MAINTENANCE CS-7310P MAINTENANCE Moving parts can amputate fingers or cause severe injuries. Keep hands, clothing and loose objects away from all openings. Always stop engine, disconnect spark plug, and make sure all moving parts have come to a complete stop before removing obstructions, clearing debris, or servicing unit. Allow unit to cool before performing service. Wear gloves to protect hands from sharp edges and hot surfaces.
CS-7310P MAINTENANCE Maintenance Intervals Units equipped with a Momentary STOP Switch automatically return to RUN position. Engine can start unintentionally. Always remove spark plug lead from spark plug before assembling or performing maintenance procedures, otherwise serious personal injury can result.
MAINTENANCE COMPONENT / SYSTEM CS-7310P MAINTENANCE PROCEDURE REQ’D SKILL LEVEL Yearly Fuel Filter Inspect / Replace * 1 Fuel Cap Gasket Replace * 1 IMPORTANT NOTE - Time intervals shown are maximum. Actual use and your experience will determine the frequency of required maintenance. MAINTENANCE PROCEDURE NOTES: * Replacement is recommended based on the finding of damage or wear during inspection.
CS-7310P 1. MAINTENANCE Before adjusting carburetor clean or replace air filter and muffler “Spark Arrestor Screen”. 2. Make sure the bar and chain are properly adjusted. 3. Start engine and run several minutes to bring to operating temperature. Flash choke twice during warm-up to clear any air from the fuel system. 4. Stop engine. Turn “H” High Speed needle counterclockwise (CCW) to stop. Turn “L” Low Speed needle midway between full clockwise (CW) stop and CCW stop. 5.
MAINTENANCE CS-7310P Spark Plug • Check periodically. • The standard spark gap is 0.4 - 0.5 mm (0.016 - 0.02 in) • Fastening torque: 15-17 N•m (130-150 in•lbf). 0.4 - 0.5 mm (0.016 - 0.02 in) 1. Remove air cleaner cover and remove spark plug. 2. Correct the spark gap if it is wider or narrower than the standard gap. Check Fuel System • Check before every use. • After refueling, make sure fuel does not leak from around fuel pipe, fuel grommet or fuel tank cap.
CS-7310P MAINTENANCE Note: Federal EPA regulations require all model year 2012 and later gasoline powered engines produced for sale in the United States to be equipped with a special low permeation fuel supply hose between the carburetor and fuel tank. When servicing model year 2012 and later equipment, only fuel supply hoses certified by EPA can be used to replace the original equipment supply hose. Fines up to $37,500 may be enforced for using an un-certified replacement part.
MAINTENANCE CS-7310P Guide Bar 1. Clean before using. 2. Clean the groove of the guide bar (F) with a small screwdriver. 3. Clean oil holes (G) with a wire. 4. Invert guide bar periodically. 5. Clean the guide bar mount area before installing the guide bar. Sprocket F G Worn: 0.5 mm (0.020 in.) • A damaged sprocket will cause premature damage or wear of saw chain. • When the sprocket has worn 0.5 mm (0.020 in.) or more, replace it. • Check sprocket when you install new chain.
CS-7310P MAINTENANCE Spark Arrestor Muffler • The spark arrestor muffler controls the exhaust noise and prevents hot, glowing particles of carbon from leaving the muffler. • Make sure the spark arrestor screen is in good repair and properly seated in the muffler. • Certain internal combustion engines operated on forest, brush, and/or grass-covered areas in the states of Washington, Oregon, Idaho, California, Minnesota, New Jersey and Maine, are required to be equipped with a spark arrestor.
MAINTENANCE CS-7310P Exhaust Port Cleaning Level 2. Parts Required: As needed: Muffler gasket 1. Remove air cleaner cover and remove spark plug lead. 2. Place piston at top dead center. 3. Remove muffler. Check parts for wear or damage, and replace if necessary. Never use a metal tool to scrape carbon from the exhaust port. Do not scratch the cylinder or piston when cleaning the exhaust port. Do not allow carbon particles to enter the cylinder. 4.
CS-7310P MAINTENANCE Setting The Saw Chain Drive link Preset tie strap Left hand cutter Top plate Side plate Tie strap Guard link Depth gauge Right hand cutter Important points for proper maintenance of saw chain: • Keep the cutters sharp at all times. • Keep the left and the right cutters properly aligned. • Note that blunt or irregular cutters will result in poor cutting performance, increased vibration of chains and premature breakage of the saw chain.
MAINTENANCE CS-7310P • To keep correct position and correct angle, use a file holder. 10o • Hold the file horizontally. • Place the depth gauge tool firmly on guide bar so that depth gauge protrudes. Then file top of depth gauge with the flat file until flat with top of the depth gauge tool. 1/5” • One fifth of the file diameter remains above cutter edge. • Be sure to round off the front edge of the depth gauge. Depth gauge tool • Properly filed cutters are shown in illustration.
CS-7310P MAINTENANCE • When chain has been filed on the bar, supply sufficient oil to it, move the chain slowly to wash away the filings before using again. 0.65 mm (0.025 in.) • If the chain saw is operated with filings clogged in the groove, the saw chain and the guide bar will be damaged prematurely. • If the saw chain becomes soiled with resin, for instance, clean it with kerosene and soak in it oil. Parallel Depth gauge To sharpen other chains, follow chain manufacturer’s instructions.
TROUBLESHOOTING CS-7310P TROUBLESHOOTING ENGINE PROBLEM TROUBLESHOOTING CHART Problem Check Status Cause Remedy Fuel at carburetor No fuel at carburetor Fuel strainer or fuel line obstructed Clean or replace No fuel at cylinder Carburetor See your dealer See your dealer OPEN choke Engine starts hard Fuel at cylinder Muffler wet with fuel Fuel mixture too rich or Engine does not start Turn switch to STOP switch OFF - Electrical ON problem - InterSee your dealer lock switch Spark at end o
CS-7310P STORAGE ENGINE PROBLEM TROUBLESHOOTING CHART Problem Engine runs, but dies or Engine does not accelerate properly Check Status Plug dirty Spark plug or worn Cause Remedy Normal wear Clean and adjust or replace Adjust Carburetor Improper adjustment Vibration Cooling system Cooling system dirty or plugged Extended operation in dirty or Clean dusty locations Spark arrestor screen Spark arrestor screen plugged Normal wear Replace Internal engine problem See your dealer Engine does
STORAGE CS-7310P • Remove chain and guide bar. • Drain fuel tank completely. Press purge bulb 6-7 times to remove remaining fuel from carburetor then drain the tank again. Close choke, start and run the engine until it stops due to lack of fuel. • Allow engine to cool. Remove the spark plug lead from the spark plug. Remove the spark plug. Pour 7 cc (0.25 oz.) of fresh, clean, two-stroke engine oil into the cylinder through the spark plug hole. • Store in a dry area, free from dust.
CS-7310P SPECIFICATIONS SPECIFICATIONS MODEL CS-7310 Length 477 mm (18.8 in.) Width 249 mm (9.8 in) Height 323 mm (12.7 in.) Dry weight 6.7 kg (14.8 lb.) Without chain and guide bar Engine Air-cooled two-stroke single cylinder Displacement 73.5 mL (4.49 cu. in.) Bore 51.0 mm (2.01 in.) Stroke 36.0 mm (1.42 in.) Compressions ratio 6.8:1 Carburetor Diaphragm type Spark plug NGK BPMR8Y (Gap 0.4 - 0.5 mm [0.016 - 0.02 in]) Fuel tank capacity 800 mL (27.05 US. fl. oz.
PRODUCT REGISTRATION CS-7310P PRODUCT REGISTRATION Thank you for choosing ECHO Power Equipment Please go to http://www.echo-usa.com/Warranty/Register-Your-ECHO to register your new product on-line. It's FAST and EASY! NOTE: your information will never be sold or misused by ECHO, Incorporated. Registering your purchase enables us to contact you in the unlikely event of a service update or product recall, and verifies your ownership for warranty consideration.
CS-7310P X7503340000 © 10/20 ECHO Incorporated PRODUCT REGISTRATION 57
NOTES CS-7310P NOTES 58 X7503340000 © 10/20 ECHO Incorporated
CS-7310P X7503340000 © 10/20 ECHO Incorporated NOTES 59
C80915001001 - C80915999999 ECHO INCORPORATED 400 Oakwood Road Lake Zurich, IL 60047 www.echo-usa.
