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Echo shindaiwa 491s 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.
X7503312606
© 02/24 ECHO Incorporated
Operator's
Manual
491s
Chainsaw

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Summary of Contents for Echo shindaiwa 491s

  • Page 1 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. X7503312606 © 02/24 ECHO Incorporated...

  • Page 2: Table Of Contents

    Sprocket ......................49 Cooling System Cleaning................. 49 Spark Arrester Muffler ..................50 Spark Arrester Screen..................50 Setting the Saw Chain..................51 Troubleshooting......................54 Storage........................56 Storage After Use..................... 56 Specifications ......................57 Product Registration..................58 X7503312606 © 02/24 ECHO Incorporated...

  • Page 3: Introduction

    Scan QR codes for more information. For additional literature, including safety manuals where applicable, or questions regarding terms used in this manual, visit: https://www.echo-usa.com/manuals https://www.shindaiwa-usa.com/manuals X7503312606 © 02/24 ECHO Incorporated...

  • Page 4: Servicing Information

    Registering your product confirms your warranty coverage and provides a direct link between you and ECHO if we find it necessary to contact you. Additional Literature In addition to finding information online, information is available from your Authorized Shindaiwa Service Dealer, or by contacting ECHO Incorporated, 400 Oakwood Road, Lake Zurich, IL 60047, 1-800-432-ECHO (3246).

  • Page 5: Safety

    Note: This enclosed message provides tips for use, care and maintenance of the unit. CIRCLE AND SLASH SYMBOL This symbol means the specific action shown is prohibited. Ignoring these prohibitions can result in serious or fatal injury. X7503312606 © 02/24 ECHO Incorporated...

  • Page 6: International Symbols

    Both of the operator’s hands Fuel and Oil must be used to Mixture operate the chainsaw. Hot Surface Chain Oil Fill X7503312606 © 02/24 ECHO Incorporated...
  • Page 7 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 Note: Not all symbols will appear on your unit. X7503312606 © 02/24 ECHO Incorporated...

  • Page 8: Personal Condition And Safety Equipment

    Eye protection that meets ANSI Z87.1 or CE requirements  must be worn whenever you operate the unit. For additional safety, a full-face shield can be worn over  safety glasses or goggles to provide protection from sharp branches or flying debris. X7503312606 © 02/24 ECHO Incorporated...
  • Page 9 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. Breathing Protection Operators who are sensitive to dust or other common airborne allergens may need to wear a dust mask to prevent inhaling these materials while operating unit.
  • Page 10 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.
  • Page 11 Never touch wires directly or indirectly, otherwise serious injury or death can result. Do not operate this product indoors or in inadequately ventilated areas. Engine exhaust contains poisonous emissions and can cause serious injury or death. X7503312606 © 02/24 ECHO Incorporated...

  • Page 12: Rules For Safe Operation

    With a basic understanding of kickback, you can reduce or eliminate the element of Kickback Danger Zone surprise. Sudden surprise contributes to accidents. X7503312606 © 02/24 ECHO Incorporated...

  • Page 13: Correct Use Of Chain Brake

    • If the brake is tripped by kickback reaction, the chain will stop immediately. Release the throttle to avoid possible damage to the engine or clutch. • Do not attempt to operate the Locked engine with the brake locked. X7503312606 © 02/24 ECHO Incorporated...
  • Page 14 Chain brakes have been designed and tested to comply with international safety standards as follows: USA: ANSI Standard B175.1 Safety Requirement for chainsaws Canada: CSA Standard Z62.1, Z62.3 X7503312606 © 02/24 ECHO Incorporated...
  • Page 15 The impact should lock the chain brake. When checking the operation of the automatic chain brake, use a soft surface substance like wood to absorb the impact so the chain is not damaged. X7503312606 © 02/24 ECHO Incorporated...
  • Page 16 14. Keep the handles dry, clean, and free of oil or fuel mixture. 15. Operate the chainsaw only in well ventilated areas. 16. Do not operate a chainsaw in a tree unless you have been specifically trained to do so. X7503312606 © 02/24 ECHO Incorporated...
  • Page 17 Always use the saw from the right-hand side of your body –  NEVER from the left side. Always wear proper safety clothing to protect your lower  body from sharp saw chain and hot muffler. X7503312606 © 02/24 ECHO Incorporated...
  • Page 18 If damage or leaks are found, do not use unit, otherwise serious personal injury or property damage may occur. Have unit repaired by an authorized servicing dealer before using. X7503312606 © 02/24 ECHO Incorporated...

  • Page 19: (Exhaust & Evaporative)

    The 50 or 300 hour emission compliance period is the time span selected by the manufacturer certifying the engine emissions output meets applicable emissions regulations, provided that approved maintenance procedures are followed as listed in the Maintenance Section of this manual. X7503312606 © 02/24 ECHO Incorporated...

  • Page 20: Description

    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 X7503312606 © 02/24 ECHO Incorporated...
  • Page 21 CHAIN BRAKE - Stops the saw chain. DRIVE SPROCKET - Drives saw chain. CLUTCH - Turns drive sprocket when engine rpm is fast enough to provide the power needed for cutting. X7503312606 © 02/24 ECHO Incorporated...

  • Page 22: Contents

    Instructions to Install Optional Kick Guard to Bar Tools Needed: Two 11 mm (7/16 in.) Wrenches. For saws with Optional Kick Guard, P/N 2894901, and Symmetrical or Asymmetrical Low-Kick type (Double Guard) guide bars: X7503312606 © 02/24 ECHO Incorporated...
  • Page 23 Move the chain brake lever (A) (Front hand guard) fully REARWARD (UNLOCK chain brake) to remove or install the sprocket guard cover (C). Remove sprocket guard cover nuts (D) and remove sprocket guard cover (C). X7503312606 © 02/24 ECHO Incorporated...
  • Page 24 If brake band is not in place around drum, remove sprocket guard cover (C), and reinstall. Tighten sprocket guard nuts (D) finger tight. Adjust saw chain tension, as instructed in “Adjusting Chain Tension”. X7503312606 © 02/24 ECHO Incorporated...
  • Page 25 Release the cylinder cover thumbscrew, and remove the cylinder cover. Remove spark plug lead. Unlock chain brake and Unlock chain brake loosen sprocket guard nuts. Hold the bar nose up, and turn the adjuster screw (A) clockwise until chain contacts underside of the bar. X7503312606 © 02/24 ECHO Incorporated...
  • Page 26 Pull the chain around the bar by hand. Loosen the adjustment if you feel tight spots. Assemble components in reverse order. Keep chain properly tensioned at all times. Note: All chains require frequent adjustments. X7503312606 © 02/24 ECHO Incorporated...

  • Page 27: Operation

    Diesel or alternative fuels may also cause premature deterioration of fuel lines, gaskets, carburetors and other engine components. X7503312606 © 02/24 ECHO Incorporated...
  • Page 28 Gasoline may contain up to 10% Ethanol (grain alcohol) or 15% MTBE (methyl tertiary-butyl ether). Gasoline containing methanol (wood alcohol) is NOT approved. Use of ECHO branded fuel is recommended to extend engine life in all air-cooled 2-stroke and 2/4-stroke hybrid engines.
  • Page 29 Vapors ignited by an ignition source can flash back to the fuel container, resulting in an explosion, fire, serious or fatal injuries, and extensive property damage. X7503312606 © 02/24 ECHO Incorporated...
  • Page 30 (30) days, ninety (90) days when a fuel stabilizer is added. Stored 2-stroke fuel may separate. ALWAYS shake fuel container thoroughly before each use. Used oil and gasoline, and soiled towels are hazardous waste materials. Disposal laws vary by locality. X7503312606 © 02/24 ECHO Incorporated...

  • Page 31: Chain Lubricant

    Never use fast idle throttle latch for cutting. Use the fast  idle throttle latch only in starting. Use the chain brake only in starting or in emergencies.  X7503312606 © 02/24 ECHO Incorporated...
  • Page 32 Pull starter handle again to start the engine. When engine starts, immediately squeeze and release throttle trigger for disengaging throttle latch and to return engine to idle. Pull front hand guard towards the operator immediately (Chain brake unlocked position). X7503312606 © 02/24 ECHO Incorporated...

  • Page 33: Starting Warm Engine

    Note: If engine does not start after 5 pulls, use cold start procedure. Note: Do not increase engine speed while chain brake is locked. Severe brake damage can result. X7503312606 © 02/24 ECHO Incorporated...

  • Page 34: Running

    Confirm proper acceleration and Shown with Optional lubrication of chain and bar. Kick Guard Do not run the engine at high speed unnecessarily. Be sure that saw chain stops moving when throttle trigger is released. X7503312606 © 02/24 ECHO Incorporated...

  • Page 35: Stopping

    Shown with Optional Kick Guard 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. X7503312606 © 02/24 ECHO Incorporated...

  • Page 36: Cutting Instructions

    Before attempting to fell a tree, cut some small logs or limbs. Become thoroughly familiar with the controls and the responses of the saw. X7503312606 © 02/24 ECHO Incorporated...
  • Page 37 Keep chain properly tensioned during operation to prevent  the chain from jumping out of the guide bar rail slot and damaging metal engine parts. X7503312606 © 02/24 ECHO Incorporated...
  • Page 38 5 cm (2 in.) will act as a One-third tree diameter hinge when the tree falls, guiding it in the desired direction. When the tree starts to fall, kill the engine, place the saw on the ground and make your retreat quickly. X7503312606 © 02/24 ECHO Incorporated...
  • Page 39 Always use both hands. Don’t cut with the saw overhead or aligned vertically with your body. If the saw should kick back, you may not have enough control to prevent possible injury. X7503312606 © 02/24 ECHO Incorporated...

  • Page 40: Chain And Guide Bar Combination

    S20BPX72CQ 508 (20) S20F0AD3378 8.26 (0.325) S20BPX78CQ Use of replacement saw chain and/or guide bar other than that specified, or operation without the optional Kick Guard place, may cause severe kickback resulting in serious injury. X7503312606 © 02/24 ECHO Incorporated...

  • Page 41: Guide Bar

    ANSI B175.1 or CSA Z62.1, .3 (safety requirements for gasoline-powered chainsaws). Optional Kick Guards 2894902 for ECHO models CS-2511T- CS-400 2893202 for ECHO models CS-4510 - CS-800P 2894902 for Shindaiwa models 305s, 340s, 358TS, 402s 2893202 for Shindaiwa models 491s, 591, 600SX. X7503312606...

  • Page 42: Maintenance

    Level 1 = Easy to do. Common tools may be required. Level 2 = Moderate difficulty. Some specialized tools may be required. Level 3 = See your dealer. Click HERE or go to http://www.echo-usa.com/products/maintenance-kit HERE https://www.shindaiwa-usa.com/you-can.aspx X7503312606 © 02/24 ECHO Incorporated...

  • Page 43: Maintenance Intervals

    Air Filter Replace * Oil Filter Inspect / replace * Fuel Filter Inspect * Fuel Cap Gasket Inspect * Spark Plug Inspect / clean / replace * Muffler Spark Arrester Inspect / clean / replace * X7503312606 © 02/24 ECHO Incorporated...

  • Page 44: Carburetor Adjustment

    During the break-in period your engine performance will increase and exhaust emissions will stabilize. Idle speed can be adjusted as required. X7503312606 © 02/24 ECHO Incorporated...
  • Page 45 “L” needle CCW 1/8 turn and repeat acceleration. Continue adjustment until smooth acceleration results. Check idle speed and reset if necessary as described in item 5. If a tachometer is available idle speed should be set to value listed on specifications page. X7503312606 © 02/24 ECHO Incorporated...

  • Page 46: Air Filter

    Turn air filter cover knob (A) clockwise until hand tight. 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. X7503312606 © 02/24 ECHO Incorporated...

  • Page 47: Check Fuel System

    Automatic Oiler • The discharge volume of the automatic oiler is adjusted to approximately 7 mL/min at 7000 r/ min, prior to shipment from factory. • Always check oil discharge when in use. X7503312606 © 02/24 ECHO Incorporated...

  • Page 48: Automatic Oiler

    Clean before using. Clean the groove of the guide bar (A) 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. X7503312606 © 02/24 ECHO Incorporated...

  • Page 49: Guide Bar

    • 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 arrester. X7503312606 © 02/24 ECHO Incorporated...

  • Page 50: Spark Arrester Muffler

    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. X7503312606 © 02/24 ECHO Incorporated...

  • Page 51: Setting The Saw Chain

    Then file top of depth gauge with the flat file until flat with top of the depth gauge tool. • One-fifth of the file diameter remains above cutter edge. X7503312606 © 02/24 ECHO Incorporated...
  • Page 52 • If the saw chain becomes soiled with resin, for instance, clean it with Parallel kerosene and soak in it oil. Depth gauge To sharpen other chains, follow chain manufacturer’s instructions. X7503312606 © 02/24 ECHO Incorporated...
  • Page 53 Clean or replace runs, but Fuel filter Contaminants Replace filter or dies Fuel filter dirty or residue in fuel replace fuel Engine Fuel vent Contaminated Fuel vent Clean or replace does not plugged fuel accelerate properly X7503312606 © 02/24 ECHO Incorporated...

  • Page 54: Troubleshooting

    See your dealer problem crank Fuel vapors are extremely 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. X7503312606 © 02/24 ECHO Incorporated...
  • Page 55 Do not lend or rent your chainsaw without the Operator’s Manual. Note: • For future reference, you should keep this Operator’s Manual. • If this Operator’s Manual becomes illegible or is lost, please contact your dealer, or go to www.echo-usa.com. X7503312606 © 02/24 ECHO Incorporated...

  • Page 56: Storage

    Centrifugal type Sprocket type Spur type, 6-tooth, 3/8 in. pitch Chain brake Automatic band brake type Idle speed 2,800RPM Clutch engagement 3,900RPM speed Wide Open Throttle 11,500 RPM speed (W.O.T.) Chain tensioner Side access system X7503312606 © 02/24 ECHO Incorporated...

  • Page 57: Specifications

    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 58: Product Registration

    PRODUCT REGISTRATION X7503312606 © 02/24 ECHO Incorporated...
  • Page 59 NOTES NOTES X7503312606 © 02/24 ECHO Incorporated...
  • Page 60 C68415001001 - C68415999999 ECHO INCORPORATED 400 Oakwood Road Lake Zurich, IL 60047 -usa www.shindaiwa .com...

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