Operator’s Manual CS-7310P Chainsaw 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 and Serial Number.................................................................................... 3 Service .................................................................................................
CS-7310P INTRODUCTION INTRODUCTION Specifications, descriptions, and illustrative material in this literature are as accurate as possible. Specifications are subject to change without notice. Illustrations might include optional equipment and accessories, and might not include all standard equipment. Your equipment might appear slightly different than pictured equipment. Read and understand all provided literature.
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 Chainsaw 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 CS-7310P 2. Keep a good firm 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 chainsaw handles. A firm grip will help you reduce kickback and maintain control of the saw. Don’t let go. 3. Make sure that the area in which you are cutting is free from obstructions.
CS-7310P SAFETY • Slowly operate the chain brake lever while holding the saw firmly on the ground. When the brake lever trips, the chain should stop. Immediately release the throttle trigger. 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.
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 chainsaw with one hand! Serious injury to the operator, helpers, bystanders, or any combination of these persons may result from one-handed operation. A chainsaw is intended for twohanded use. 2. Do not operate a chainsaw 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 chainsaw, use the appropriate guide bar scabbard. 19. A spark arrestor muffler approved to SAE Standard J335 is standard on this chainsaw to reduce the possibility of forest fires. Do not operate the chainsaw 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 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 SAFETY 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. Wear Eye, Ear, and Head Protection. Tip contact may cause the guide bar to move suddenly upward and backward, which may cause serious injury.
SAFETY Symbol CS-7310P Description Symbol Chain Brake Operation Description Chain Oiler Adjustment Choke Control “COLD START” Position (Choke Closed) Purge Bulb Choke Control “RUN” Position (Choke Open) STOP Decompression Device STOP STOP / Momentary STOP Switch Note: Not all symbols will appear on your unit.
CS-7310P SAFETY 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.
SAFETY CS-7310P 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 and Ear Protection ECHO recommends wearing personal protective equipment whenever unit is used.
CS-7310P SAFETY 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.
SAFETY CS-7310P 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.
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. 2 1 3 4 13 5 6 12 11 10 15 7 9 8 14 16 17 19 20″20H0PS3872 72LPX72CQ 51.8 38.3 30.
CS-7310P 1. Guide Bar 2. Chain Brake Lever / Front Hand Guard 3. Spark Plug 4. Air Cleaner Cover DESCRIPTION 5. Stop Switch 6 Throttle Trigger Lockout 7. Rear Handle - For the right hand 8. Rear Hand Guard 9. Throttle Trigger 10. Fuel Tank Cap 11. Starter Handle 12. Oil Tank Cap 13. Spark Arrestor Muffler or Spark Arrestor Muffler with Catalyst 14. Decompression Device 15. Front Handle - For the left hand 16. Chain Tension Adjuster 17. Chain Catcher 18. Spiked Bumper 19.
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 and 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. 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.. DESCRIPTION F E E H 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 CS-7310P Hold the bar nose up, and turn adjuster (I) clockwise until chain contacts underside of the bar. I 3. Tighten nuts with the bar nose held up. 4. Pull the chain around the bar by hand. Loosen the adjustment if you feel tight spots. Tighten guide bar nuts to 20-23 N•m (200 to 230 kgf•cm, 175-200 lbf•in). DO NOT over-tighten nuts. Damage to saw can result. 5. Assemble components in reverse order. 6. 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 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. Engine exhaust IS HOT, and contains Carbon Monoxide (CO), a poison gas. Breathing CO can cause unconsciousness, serious injury, or death. Exhaust can cause serious burns.
CS-7310P OPERATION 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 and oil tanks are indicated by the following illustrations • Use bar and chain oil of high quality for this purpose. • Do not use used or reclaimed oil to avoid various oiler problems. Fuel tank cap Oil tank cap • Use high quality bar and chain oil.
OPERATION CS-7310P Starting Cold Engine Make sure the bar and chain are free from any obstruction when starting the chainsaw. 1. Move chain brake lever fully FORWARD to LOCK chain brake before starting. 2. Fill the fuel tank with fuel mixture. Do not over fill. 3. Fill the chain oil tank with lubricant. Do not over fill. 4. Move STOP switch (A) UP to “RUN” position. A 5. Press the decompression device (B).
CS-7310P 6. OPERATION 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 chainsaw and pull starter handle until first starting sound. 8.
OPERATION CS-7310P Note: If engine does not start after 5 pulls, repeat instructions. After starting the engine, immediately squeeze and then release throttle trigger to release fast idle throttle latch, otherwise severe brake damage can occur. ◆ Never use fast idle throttle latch for cutting. ◆ 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.
CS-7310P 4. OPERATION Press the decompression device (B). B 5. Securely hold the chainsaw as shown and pull starter handle. 6. Choke may be used if necessary, but after first starting sound, squeeze throttle trigger to release choke and return engine to idle. 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.
OPERATION 2. Move chain brake lever fully REARWARD to UNLOCK chain brake. 3. Squeeze throttle trigger (D) gradually and increase engine speed. 4. The chain starts running when the engine reaches clutch engagement speed (see specifications page). 5. Confirm proper acceleration and lubrication of chain and bar. 6. Do not run the engine at high speed unnecessarily. 7. Be sure that saw chain stops moving when throttle trigger is released. CS-7310P D Stopping 1.
CS-7310P OPERATION Checking Chain Tension Do not operate with a loose chain. Chain tension should be checked frequently during work and corrected as necessary. Chain Lubrication Test Hold the chain just above a dry surface and open the throttle to half speed for 30 seconds. A thin line of “thrown” oil should be seen on the dry surface. Cutting Instructions General ◆ ◆ This chainsaw is designed for cutting wood. Do not cut metal, plastic or any non-wood material.
OPERATION ◆ 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. Should the tip contact a limb or log while the chain is moving, the tip will be pushed upward with considerable force. This is known as kickback. Avoid it! CS-7310P Kickback In all circumstances the operation of the chainsaw is a one-man job. It is difficult at times to take care for your own safety, so don’t assume the responsibility for a helper as well.
CS-7310P OPERATION Sap from palm trees may corrode metal parts unless proper saw maintenance is performed. Make sure to clean metal parts from palm sap immediately after use. • Remove sprocket guard. Clean wood chips and sawdust from guard and engine crankcase. • Never use metal tools for cleaning which can scratch the metal paint and allow corrosion to develop. • Clean sap accumulation from metal parts with cloth and warm water with soap. • Rinse with clean water and dry metal surfaces.
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 Chain and Guide Bar Combination The following combinations are recommended for model CS-7310P. Guide Bar Length mm (in.) Saw Chain ECHO Part No. Pitch (in.) Type Links 72LPX72CQ 72 72LPX84CQ 84 0.050 in. Gauge 508 (20) 20H0PS3872 610 (24) 24H0PS3884 711 (28) 28H0PS3893 813 (32) 32H0PS3805 3/8 72LPX93CQ 93 72LPX105CQ 105 73LPX72CQ 72 73LPX84CQ 84 73LPX92CQ 92 73LPX105CQ 105 0.058 in.
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 CS-7310P MAINTENANCE PROCEDURE COMPONENT OR SYSTEM Cylinder Exhaust Port REQUIRED SKILL LEVEL Inspect / Clean / De-carbon 2 Fuel Filter Inspect / Replace * 1 Fuel Cap Gasket Replace * 1 Yearly 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. Air Filter 1. Check before every use.
CS-7310P MAINTENANCE 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. • In case of fuel leakage there is a danger of fire. Stop using the machine immediately and request your dealer to inspect or replace. Fuel Filter • Check periodically. • Do not allow dust to enter fuel tank. • A clogged filter (C) will cause difficulty in starting engine or abnormalities in engine performance. 1.
MAINTENANCE CS-7310P Automatic Oiler • The discharge volume of the automatic oiler is adjusted to approximately 4 mL/min at 7000 r/min, prior to shipment from factory. • Always check oil discharge when in use. • Turn adjusting screw (D) counterclockwise to increase oil volume, clockwise to decrease oil volume. D • Do not turn the adjusting screw beyond the maximum or minimum limit of volume adjustment. Oil Filter • Check periodically. • Do not allow dust to enter into oil tank.
CS-7310P MAINTENANCE 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.
MAINTENANCE CS-7310P Cooling System Cleaning • Check periodically. • Clogged fins will result in poor engine cooling. 1. Remove air cleaner cover. 2. Use compressed air or wooden tool to remove dirt and dust from between fins (H) to let cooling air pass easily. H Spark Arrestor Muffler • The spark arrestor muffler controls the exhaust noise and prevents hot, glowing particles of carbon from leaving the muffler.
CS-7310P MAINTENANCE Spark Arrestor Screen Carbon deposits in muffler will cause drop in engine output and overheating. Spark arrestor screen must be checked periodically. 1. Remove air cleaner cover and remove spark plug lead. 2. Remove spark arrestor screen (I) from muffler (J) body. 3. Clean carbon deposits from muffler components. 4. Replace screen if it is cracked, or has holes burned through. 5. Assemble components in reverse order.
MAINTENANCE CS-7310P 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. Use a wood or plastic scraping tool to clean deposits from cylinder exhaust port. 5. Install muffler. Tighten muffler mounting bolts (or nuts) to 8-11 N•m (70-95 lbf•in). 6. Install engine cover and attach spark plug lead. 7. Replace air cleaner cover. 8.
CS-7310P MAINTENANCE If the engine is adjusted for operation above 1,100 feet ASL, the carburetor must be re-adjusted when operating the engine below 1,100 feet ASL, otherwise severe engine damage can result. 1. 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.
MAINTENANCE CS-7310P Setting the Saw Chain Preset Tie Strap Drive Link Left Hand Cutter Top Plate Tie Strap Guard Link Side Plate 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.
CS-7310P MAINTENANCE • Hold the file at a 10° angle from level. 10° • 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. • Be sure 1/5th, or 20% of the file diameter remains above cutter edge. Depth Gauge Tool 1/5 • Be sure to round off the front edge of the depth gauge.
MAINTENANCE CS-7310P • Properly filed cutters are shown in illustration. • When setting of the chain is finished, soak it in oil and wash away filings completely before using. • 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. 60° 25° Top plate filing angle Side plate angle 0.64 mm (0.025 in.) • If the chainsaw is operated with filings clogged in the groove, the saw chain and the guide bar will be damaged prematurely.
CS-7310P TROUBLESHOOTING 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
STORAGE CS-7310P 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
CS-7310P SPECIFICATIONS • 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.
PRODUCT REGISTRATION MODEL CS-7310P CS-7310P Gasoline Use 89 octane unleaded. Do not use fuel containing methyl alcohol, more than 10% ethyl alcohol or 15% MTBE. Do not use alternative fuels such as E-15 or E-85. Oil ISO-L-EGD (ISO/CD 13738) and JASO M345-FD two-stroke, air-cooled engine oil. Oiling system Adjustable automatic oiler Chain oil capacity 360 mL (12.17 US. fl. oz.) Starter system Automatic rewind starter Clutch Centrifugal type Sprocket type Floating Rim, 7-tooth, 3/8 in.
PRODUCT REGISTRATION ECHO Incorporated CS-7310P X7503340002 © 11/21 ECHO Incorporated 59
C80915001001 - C80915999999 ECHO INCORPORATED 400 Oakwood Road Lake Zurich, IL 60047 www.echo-usa.
