Shindaiwa 251TSN Operator's Manual
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Shindaiwa 251TSN Operator's Manual

Shindaiwa 251TSN Operator's Manual

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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.
Note: In Canada, this chainsaw is designated for tree service and is only to
be used by a trained operator.
X7503336000
© 01/25 ECHO Incorporated
Operator's
Manual
251TSN
Chainsaw

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Summary of Contents for Shindaiwa 251TSN

  • Page 1 Operator’s Manual 251TSN 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.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS 251TSN TABLE OF CONTENTS Introduction......................... 3 Servicing Information....................4 Parts and Serial Number..................4 Service ....................... 4 Consumer Product Support................4 Product Registration................... 4 Additional Literature ................... 4 Safety ......................... 5 Manual Safety Symbols and Important Information ........... 5 International Symbols..................

  • Page 3: Introduction

    251TSN 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.

  • Page 4: Servicing Information

    Service Service of this product during the warranty period must be performed by an Authorized Shindaiwa Service Dealer. For the name and address of the Authorized Shindaiwa Service Dealer nearest you, ask your retailer or call: 1-877-986-7783. Dealer information is also available on www.shindaiwa- usa.com.

  • Page 5: Safety

    251TSN SAFETY SAFETY 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.

  • Page 6: International Symbols

    SAFETY 251TSN International Symbols Symbol Description Symbol Description WARNING! Read and follow all safety precautions in the Carburetor instruction Adjustment - manual. Failure to High Speed follow instructions Mixture could result in serious personal injury. Wear Eye, Ear, Carburetor and Head Adjustment - Idle Protection.
  • Page 7 251TSN SAFETY Symbol Description Symbol Description Chain Brake Chain Oiler Operation Adjustment Choke Control COLD START Position (Choke Closed) Purge Bulb Choke Control RUN Position (Choke Open) STOP / Decompression Momentary Device STOP Switch Not all symbols will appear on your unit.

  • Page 8: Personal Condition And Safety Equipment

    SAFETY 251TSN 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. If unit is equipped with muffler, always keep clear of exhaust and muffler area, otherwise serious personal injury might occur.
  • Page 9 251TSN 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 and Ear Protection ECHO recommends wearing personal protective equipment whenever unit is used.
  • Page 10 SAFETY 251TSN 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.
  • Page 11 251TSN 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).

  • Page 12: Rules For Safe Operation

    SAFETY 251TSN 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.

  • Page 13: Correct Use Of Chain Brake

    251TSN SAFETY Do not overreach or cut above shoulder height. Follow manufacturer’s sharpening and maintenance instructions for the saw chain. Only use replacement bars and chains specified by the manufacturer or the equivalent. Correct Use of Chain Brake Chain Brake Operation •...
  • Page 14 SAFETY 251TSN 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.
  • Page 15 251TSN SAFETY Automatic Chain Brake Kickback produced from the tip of the guide bar will trip the automatic chain brake. To make sure that the automatic chain brake operates properly, follow these steps: Stop the engine. Hold the saw with the guide bar approximately 35 cm (14 in.) above a wooden surface.
  • Page 16 SAFETY 251TSN 10. 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. 11. Shut off the engine before setting the chainsaw down.
  • Page 17 251TSN SAFETY Chainsaws shall be used in accordance with the operating instructions and safety precautions listed in the operator's manual(s). It shall be the responsibility of the owner to see that such instructions and precautions are given to every operator who uses the saw.
  • Page 18 SAFETY 251TSN Chain brake - brake actuated by kickback energy, not ◆ manual activation. Reduced-kickback guide bar - reduced nose radius guide ◆ bar. Low-kickback saw chain - saw chain that meets ANSI ◆ kickback performance requirements when configured with the bar/chain recommendations in this manual.

  • Page 19: Emission Control (Exhaust & Evaporative)

    251TSN EMISSION CONTROL (EXHAUST & EVAPORATIVE) EPA Emissions Control Information The emission control system for EMISSION CONTROL INFORMATION the engine is EM (engine ENGINE FAMILY: XEHXS.0214KO DISPLACEMENT: 21.2 cc modification) and, if the second to EMISSION COMPLIANCE PERIOD: 300 Hours last character of the Engine Family THIS ENGINE MEETS U.S.EPA EXH/EVP EMISSION...

  • Page 20: Description

    Locate the safety decal(s) or etching(s) on your unit. Make sure they are legible, and that you understand and follow the instructions. If any cannot be read, replacements can be ordered from your Shindaiwa dealer. Images shown below are for example only. Those on your unit might appear slightly different DON’T BLOCK EXHAUST AREA...
  • Page 21 251TSN DESCRIPTION Muffler cover Choke control knob Rear handle - for the right hand Front hand guard Guide bar Saw chain Chain tension adjuster Clutch cover Chain catcher 10. Stop switch 11. Throttle trigger lock out 12. Throttle trigger 13. Purge pump 14.

  • Page 22: Contents

    Due to packaging restrictions, some assembly may be necessary. After opening the carton, check for damage. Immediately notify your retailer or Shindaiwa Dealer of damaged or missing parts. Use the contents list to check for missing parts. Power head...
  • Page 23 251TSN ASSEMBLY Move chain brake lever (C) fully rearward. Remove bar/clutch cover nut (D) and remove bar/clutch cover (E). Mount guide bar (D) on guide bar stud (E) and slide toward clutch drum (F) to make saw chain (G) installation easier.
  • Page 24 ASSEMBLY 251TSN Turn saw over, check brake band (L) for correct position on clutch drum (M). If brake band is not in place around clutch drum, remove bar/clutch cover nut and bar/clutch cover. Realign and reinstall. Tighten bar/clutch cover nut finger tight.

  • Page 25: Operation

    251TSN OPERATION Tighten bar/clutch cover nut with the bar nose held up and under tension. Pull the chain around the bar by hand. Loosen the tension adjuster if you feel tight spots. Tighten bar/clutch cover nut to 12 - 15 N•m (105-135 lbf•in). Do not over-tighten nut.

  • Page 26: Fuel

    Fuel Diesel fuels and alternative fuels, such as E15 (15% ethanol), E85 (85% ethanol) or any fuels not meeting Shindaiwa requirements are not approved for use in Shindaiwa two-stroke or hybrid four-stroke gasoline engines. Use of diesel or...
  • Page 27 251TSN OPERATION Two-Stroke Oil - A two-stroke engine oil, such as Shindaiwa branded two- stroke oils, meeting ISO-L-EGD (ISO/CD 13738) and J.A.S.O. FD Standards must be used. Shindaiwa branded two-stroke oils meet these standards. Engine problems due to inadequate lubrication caused by failure to use an ISO-L-EGD (ISO/CD 13738) and J.A.S.O.
  • Page 28 OPERATION 251TSN Do not fill fuel tanks indoors. Always fill fuel tanks ◆ outdoors over bare ground. Do not overfill fuel tank. Wipe up spills immediately. ◆ Securely tighten fuel tank cap and close fuel container ◆ after refueling. Inspect for fuel leakage. If fuel leakage is found, do not ◆...
  • Page 29 251TSN OPERATION After use • Empty the fuel tank prior to storing the unit. Return unused fuel to an approved fuel storage container. Storage - Fuel storage laws vary by locality. Contact your local government for the laws affecting your area. As a precaution, store fuel in an approved, airtight container.

  • Page 30: Chain Lubricant

    OPERATION 251TSN Chain Lubricant Note: Cap indication - Fuel/oil tanks are indicated by the following illustrations. Proper lubrication of the chain while in operation reduces friction between the chain and the guide bar to a minimum and assures a longer...

  • Page 31: Starting Cold Engine

    251TSN OPERATION Starting Cold Engine Make sure the bar and chain are free from any obstruction when starting the chainsaw. Move chain brake lever fully Chain Brake Locked FORWARD to LOCK chain brake before starting. Fill the fuel tank with fuel mixture.
  • Page 32 OPERATION 251TSN After choke control knob is rotated 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.

  • Page 33: Starting Warm Engine

    251TSN OPERATION 10. When engine starts, Throttle Trigger immediately squeeze and release throttle trigger to release fast idle throttle latch. Note: Do not pull starter rope out to maximum position. Do not allow recoil handle to snap back against the casing.

  • Page 34: Running

    OPERATION 251TSN Securely hold the chainsaw as Chain Brake Locked shown and pull starter handle. 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 five pulls, use Cold Start Procedure.

  • Page 35: Stopping

    251TSN OPERATION Squeeze throttle trigger Throtttle Trigger gradually and increase engine speed. The chain starts running when the engine reaches clutch engagement speed. Confirm proper acceleration and lubrication of chain and bar. Do not run the engine at high speed unnecessarily.

  • Page 36: Chain Lubrication Test

    OPERATION 251TSN 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 ◆...
  • Page 37 251TSN OPERATION The accepted way to hold the saw is to stand to the left of the saw with your left hand on the front handle and your right hand on the rear handle so you can operate the throttle trigger with your right index finger.
  • Page 38 OPERATION 251TSN Do not run a chainsaw not under cutting load at wide open ◆ throttle longer than five seconds or engine damage can occur. Keep chain properly tensioned during operation to prevent ◆ the chain from jumping out of the guide bar rail slot and damaging metal engine parts.
  • Page 39 251TSN OPERATION Begin the cut on the side to which the tree is to fall. Cut a Direction of fall notch about 1/3 of the way into Hinge the tree. The position of this notch is important since the tree will try to fall into the...
  • Page 40 OPERATION 251TSN Bucking Bucking is the sawing of a log or fallen tree into smaller pieces. There Uphill Position are a few basic rules which apply to all bucking operations. • Keep both hands on the handles at all times.

  • Page 41: Guide Bar And Chain Combination

    251TSN OPERATION Guide Bar and Chain Combination The following combinations are recommended for model 251TSN. Guide Bar Saw Chain Length Shindaiwa Part Pitch (in.) Type Links mm (in.) 305 (12) S12A4CD3251C 0.325 S80TXL51CQ 356 (14) S14A4CD3259C 0.325 S80TXL59CQ Use of replacement saw chain and/or guide bar other than that specified may cause severe kickback resulting in serious injury.

  • Page 42: Maintenance

    MAINTENANCE 251TSN MAINTENANCE Moving parts can amputate fingers or cause severe injuries. Keep hands, clothing and loose objects away from all openings. Always stop unit, disconnect spark plug or remove battery, and make sure all moving parts have come to a complete stop before removing obstructions, clearing debris, or servicing unit.

  • Page 43: Maintenance Intervals

    251TSN 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.

  • Page 44: Lifting Hook

    If you have any doubt with regards to their condition, have the unit checked out by your nearest authorized Shindaiwa dealer. X7503336000 © 01/25 ECHO Incorporated...

  • Page 45: Air Filter

    251TSN MAINTENANCE Air Filter Check before every use. CLOSE choke ( Raise lifting hook (A), and push towards the lower position. Release the air filter cover latch (B) with included T-wrench (C). Lift the cover (D) and remove the air filter (E).

  • Page 46: Check Fuel System

    MAINTENANCE 251TSN Check Fuel System • Check before every use. • After refueling, make sure fuel does not leak from around fuel line, 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.

  • Page 47: Automatic Oiler

    251TSN MAINTENANCE Automatic Oiler • The discharge volume of the automatic oiler is adjusted to approximately 7 ml/min at 7000 RPM, prior to shipment from the factory. When turned counterclockwise and the screw stops, the position indicates maximum discharge volume of 13 ml/min at 7,000 RPM.

  • Page 48: Guide Bar

    MAINTENANCE 251TSN Guide Bar Clean before using. Clean groove (A) of the guide bar with a small screwdriver. Clean oil holes (B) with a wire. Invert guide bar periodically. Clean the guide bar mount area before installing the guide bar.

  • Page 49: Spark Arrester Muffler

    251TSN MAINTENANCE Clean the periphery of the ignition coil and the flywheel magneto. Assemble the components in reverse order. Spark Arrester Muffler • The spark arrester muffler controls the exhaust noise and prevents hot, glowing particles of carbon from leaving the muffler.

  • Page 50: Exhaust Port Cleaning

    MAINTENANCE 251TSN Remove spark arrester screen (C) from muffler body (D). Clean carbon deposits from muffler components. Replace spark arrester screen (C) if it is cracked, or has holes burned through. Assemble components in reverse order. Note: When cleaning carbon deposits, be careful not to damage the catalytic element inside muffler body (D).

  • Page 51: Carburetor Adjustment

    251TSN MAINTENANCE 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. Use a wood or plastic scraping tool to clean deposits from cylinder exhaust port.
  • Page 52 MAINTENANCE 251TSN If the engine is adjusted for operation above 335 m (1,100 ft.) ASL, the carburetor must be readjusted when operating the engine below 335 m (1,100 ft.) ASL, otherwise severe engine damage can result. Before adjusting carburetor clean or replace air filter and muffler spark arrester screen.

  • Page 53: Setting The Saw Chain

    251TSN MAINTENANCE When starting, idling adjustment speed should be adjusted to prevent the saw chain from moving. When you experience trouble with the carburetor, contact your dealer. Setting the Saw Chain Preset Tie Strap Left Hand Cutter Drive Link Top Plate...
  • Page 54 MAINTENANCE 251TSN Setting the Saw Chain • For setting saw chain, round file (5/32 in. diameter) and flat file are used. • Push file as shown. 25° • To keep correct position and correct angle, use a file holder. Keep this angle •...
  • Page 55 251TSN MAINTENANCE • Be sure to round off the front edge of the depth gauge. • Properly filed cutters are 70° shown in illustration. • When setting of the chain is finished, soak it in oil and wash away filings completely before using.

  • Page 56: Troubleshooting

    TROUBLESHOOTING 251TSN TROUBLESHOOTING Fuel vapors are flammable and can cause fire and/or explosion. Never test for ignition spark by grounding spark plug near cylinder plug hole, otherwise serious personal injury can result. ENGINE PROBLEM TROUBLESHOOTING CHART Problem Check Status Cause Remedy Clean or replace.
  • Page 57 251TSN TROUBLESHOOTING ENGINE PROBLEM TROUBLESHOOTING CHART Problem Check Status Cause Remedy Engine Air filter Air filter dirty Normal wear Clean or replace. runs, but Fuel filter Contaminants or Replace filter or dies Fuel filter dirty residue in fuel replace fuel.

  • Page 58: Storage

    STORAGE 251TSN STORAGE Storage After Use 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. Serious personal injury can result.

  • Page 59: Specifications

    251TSN SPECIFICATIONS SPECIFICATIONS MODEL 251TSN Length 243 mm (9.57 in.) Width 201 mm (7.90 in) Height 196 mm (7.72 in.) Dry weight (without chain and guide 2.3 kg (5.07 lb.) bar) Engine Air-cooled two-stroke single cylinder Displacement 25.0 ml (1.53 in.

  • Page 60: Product Registration

    PRODUCT REGISTRATION Thank you for choosing Shindaiwa Power Equipment Please go to http://www.shindaiwa-usa.com 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.
  • Page 61 251TSN PRODUCT REGISTRATION X7503336000 © 01/25 ECHO Incorporated...
  • Page 62 NOTES 251TSN NOTES X7503336000 © 01/25 ECHO Incorporated...
  • Page 63 251TSN NOTES X7503336000 © 01/25 ECHO Incorporated...
  • Page 64 F05412001001 - F05412999999 F05513001001 - F05513999999 ECHO INCORPORATED 400 Oakwood Road Lake Zurich, IL 60047 -usa www.shindaiwa .com...

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