Echo CS-4920 Operator'S Manual Download Page 53

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CS-4920

MAINTENANCE

X7503352100

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

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.

• Drive link serves to remove

sawdust from the groove of the

guide bar. Keep the lower edge

of the drive link sharp where

indicated.

Top plate

Side plate

Depth

Left hand cutter

Preset tie strap

gauge

Guard link

Drive link

Tie strap

Right hand cutter

Sharpen lower edge

Summary of Contents for CS-4920

Page 1: ...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 ...

Page 2: ... Assembly 22 Preparation for Use 22 Operation 27 Fuel 27 Chain Lubricant 30 Starting Cold Engine 31 Starting a Hard To Start Engine 33 Starting Warm Engine 34 Running 34 Stopping 35 Checking Chain Tension 36 Chain Lubrication Test 36 Cutting Instructions 36 Guide Bar and Chain Combinations 41 Kick GuardTM 42 Guide Bar 42 Saw Chain 42 Maintenance 43 Skill Levels 43 Maintenance Intervals 44 Air Filt...

Page 3: ...information for safety operation maintenance storage and assembly specific to this product 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 OR https www shindaiwa usa com manuals SERVICING INFORMATION Parts and Serial Number Genuine ECHO parts and assemblies f...

Page 4: ...ation operation or maintenance of this product call the ECHO Consumer Product Support Department at 1 800 432 ECHO 3246 from 8 00 a m to 5 00 p m Central Standard Time Monday through Friday Before calling please know the model and serial number of your unit Product Registration Register your ECHO equipment online at www echo usa com or by filling out the product registration sheet included in this...

Page 5: ...nal injury or death if not avoided The safety alert symbol accompanied by the word WARNING calls attention to an act or condition which CAN lead to serious personal injury or death if not avoided The safety alert symbol accompanied by the word CAUTION calls attention to an act or condition which might lead to minor or moderate personal injury if not avoided The enclosed message provides informatio...

Page 6: ...eed Mixture Wear Eye Ear and Head Protection Carburetor Adjustment Idle Speed Tip contact may cause the guide bar to move suddenly upward and backward which may cause serious injury Carburetor Adjustment Low Speed Mixture Contact of the guide bar tip with any object should be avoided Measured maximum kickback value without brake for approved bar and chain combinations Both of the operator s hands ...

Page 7: ...symbols will appear on your unit Chain Brake Operation Chain Oiler Adjustment Choke Control COLD START Position Choke Closed Choke Control RUN Position Choke Open Purge Bulb Decompression Device STOP Momentary STOP Switch Symbol Description Symbol Description STOP STOP ...

Page 8: ...ed improperly and or safety precautions are not followed Proper clothing and safety gear must be worn when operating unit Physical Condition Your judgment and physical dexterity may not be good If you are tired or sick If you are taking medication If you have taken alcohol or drugs Operate unit only if you are physically and mentally well Eye Protection Eye protection that meets ANSI Z87 1 or CE r...

Page 9: ...her plant matter such as pollen Make sure the mask does not impair your vision and replace the mask as needed to prevent air restrictions Proper Clothing Wear snug fitting durable clothing Pants should have long legs shirts should have long sleeves DO NOT WEAR SHORTS DO NOT WEAR TIES SCARVES JEWELRY or clothing with loose or hanging items that could become entangled in moving parts or surrounding ...

Page 10: ... is believed that a condition called Raynaud s Phenomenon which affects the fingers of certain individuals may be brought about by exposure to vibration and cold Exposure to vibration and cold may cause tingling and burning sensations followed by loss of color and numbness in the fingers The following precautions are strongly recommended because the minimum exposure which might trigger the ailment...

Page 11: ...n Instead try to maintain a straight wrist position Also when grasping use your whole hand not just the thumb and index finger Take periodic breaks to minimize repetition and rest your hands Reduce the speed and force with which you do the repetitive movement Do exercises to strengthen the hand and arm muscles Immediately stop using all power equipment and consult a doctor if you feel tingling num...

Page 12: ...which could result in serious personal injury The optional Kick GuardTM device is not installed on the guide bar when you purchase your chainsaw The optional Kick Guard can be used in a majority of cutting operations and is especially recommended for beginners homeowners or chainsaw novices Most cutting operations can be accomplished with the optional Kick Guard in place Do not rely exclusively up...

Page 13: ...g branch or any other obstruction which could be hit while you are operating the saw 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 Only use replacement bars and chains specified by the manufacturer or the equivalent Correct Use of Chain Brake Chain Brake Operation Set the lever in the ...

Page 14: ...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 Do not increase engine RPM while the chain brake is locked Do not use a bar and chain combination other than those specified in this manual For your own safety do not remove the chain brake system The installation of a chain br...

Page 15: ...62 1 3 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 1 Stop the engine 2 Hold the saw with the guide bar approximately 35 cm 14 in above a wooden surface Right hand should hold the rear handle and left hand should hold the front handle 3 Release the front han...

Page 16: ...topped the guide bar and saw chain to the rear and the muffler away from your body 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 12 Use extreme caution when cutting small size brush and saplings bec...

Page 17: ... until the hole is sufficiently large so as to introduce the entire nose tip of the guide bar This technique should reduce the danger of kickback 25 Allow your chainsaw to cool before refueling and do not smoke while refueling 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...

Page 18: ...oving safety devices may result in serious or fatal injury Unit includes safety devices that reduce the likelihood of kickback 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: ...el line emission control system is EVAP evaporative emissions Evaporative emissions for California models are only applicable to fuel tanks and fuel feed lines An Emission Control Label is located on the engine This is an EXAMPLE ONLY information on label varies by engine FAMILY Product Emission Durability Emission Compliance Period The 50 or 300 hour emission compliance period is the time span se...

Page 20: ...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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 El manual muestra otras combinaciones ...

Page 21: ...ont Hand Guard 3 Spark Arrester Muffler or Spark Arrester Muffler with Catalyst 4 Saw Chain 5 Guide Bar 6 Spiked Bumper 7 Chain Catcher 8 Chain Brake Sprocket Cover Nuts 9 Chain Tension Adjuster 10 Chain Brake Sprocket Cover 11 Rear Hand Guard 12 Air Cleaner Cover 13 Spark Plug 14 Air Cleaner Cover Latch 15 Choke Control Knob 16 Purge Bulb 17 Throttle Trigger Lockout 18 Throttle Trigger 19 Momenta...

Page 22: ...BLY Preparation for Use Saw chain is sharp Always wear gloves when handling assembly otherwise serious personal injury may result Momentary STOP Switch automatically returns 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 Note The machine may be deliver...

Page 23: ...onal Kick GuardTM to Bar Tools Needed Two 11 mm 7 16 in Wrenches 1 Install bolt A in rear hole B of optional Kick GuardTM and through front hole C in guide bar 2 IMPORTANT Dimple D in optional Kick GuardTM must engage recess E in guide bar 3 Securely tighten nut F and bolt A A B C D E F ...

Page 24: ...sprocket guard nuts D and remove sprocket guard C 4 Remove guide bar and saw chain if necessary Note See Maintenance section for guide bar saw chain maintenance procedures 5 Mount guide bar on studs E and slide toward clutch drum F to make saw chain installation easier Install saw chain around sprocket and guide bar as shown with cutters on top of guide bar facing forward 6 Install sprocket guard ...

Page 25: ...n Improper sprocket guard assembly can result in serious injury and will cause severe saw damage if unit is started Never start or operate saw if brake band is not in place on clutch drum Always check chain brake operation after replacing guard Do not use saw if chain brake does not function properly Adjusting Chain Tension Always loosen sprocket guard nuts before turning the chain tension adjuste...

Page 26: ...nd 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 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 may result 6 Assemble components in reverse order 7 Keep chain properly tensioned at all times Note All chains require frequent adjustments A ...

Page 27: ... 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 Two Stroke Oil A two stroke engine oil such as ECHO branded 2 stroke oils meeting ISO L EGD ISO CD 13738 and J A S O FD Standards must be used ECHO branded 2 stroke oils meet these standards Engine problems due to in...

Page 28: ...or sparks near fuel Fuel tanks cans may be under pressure Always loosen fuel caps slowly allowing pressure to equalize NEVER refuel a unit when the engine is HOT or RUNNING 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 leaka...

Page 29: ...re the use of automatic fuel shut off containers to reduce fuel spillage 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 Store in a well ventilated unoccupied building away from sparks and flames Empty the fuel tank prior to storing the unit Return unused fuel to an approved fuel ...

Page 30: ...the starter handle to assist in removal of the cap Note Not all caps include this feature 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 service life Use bar and chain oil of high quality for this purpose Do not u...

Page 31: ... so that exhaust is directed away from your face and body Operation of this equipment may create sparks that can start fires around dry vegetation This unit is equipped with a spark arrester 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 regardi...

Page 32: ...ntrol knob A all the way IN OPEN choke position 8 Pull starter handle to start the engine 9 When engine starts immediately squeeze and release throttle trigger C to release fast idle throttle latch otherwise severe brake damage may occur Note Do not pull starter rope out to the maximum possible position Do not allow recoil handle to snap back against the case If engine does not start after 5 pulls...

Page 33: ...hainsaw Do not start engine before chain brake is locked 1 Move chain brake lever fully FORWARD to LOCK chain brake before starting 2 Press throttle trigger lockout D down while grasping throttle trigger C 3 Securely hold the chainsaw as shown and pull starter handle 4 When engine starts immediately release throttle trigger otherwise severe brake damage may occur D C ...

Page 34: ... Choke may be used if necessary but after first firing sound squeeze and release throttle trigger to release fast idle throttle latch otherwise severe brake damage may occur 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 will result Running The saw chain should not move at idle otherwise serious...

Page 35: ...peed 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 Stopping 1 Release throttle trigger A and allow engine to idle 2 Push the momentary stop switch B until the engine is stopped Note If engine does not stop pull choke control knob out fully to stop engine Note...

Page 36: ...ication 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 Wear suitable hearing protection such as earmuffs or earplugs to protect against objectionable or uncomfortable lo...

Page 37: ...of using the saw your best aid will be your own good common sense 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 Before attempting to fell a tree cut some small logs or limbs Become thoroughly familiar with the controls and the res...

Page 38: ... and warm water with soap Rinse with clean water and dry metal surfaces Apply a light coating of engine or bar and chain oil to metal parts after they are cleaned Install and properly tension guide bar and chain Run engine for one minute alternating engine speed between full throttle for five seconds and idle for five seconds to coat metal parts with additional protective chain oil Do not run a ch...

Page 39: ...kicking back over the stump Begin the cut on the side to which the tree is to fall Cut a notch about 1 3 of the way into the tree The position of this notch is important since the tree will try to fall into the notch The felling cut is made on the side opposite the notch and at a level about 5 cm 2 in above the bottom of the notch Do not try to cut through to the notch with the felling cut The rem...

Page 40: ...e 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 Limbing Limbing a fallen tree is much the same as bucking Never stand on the tree that you are limbing When limbing caution is the word Be careful of the tip touching other limbs Always use both hands Don t cut with the s...

Page 41: ... the tree is lying on perfectly flat ground or supported as shown If you make the cut with the tree on the ground don t let the saw s chain dig into the earth it is harmful for the saw and you stand a good chance of being struck by flying debris To cut the trunk use the bucking and two cut sequence shown The first cut should be no deeper than one third the trunk diameter Guide Bar and Chain Combin...

Page 42: ... 432 ECHO 3246 or on the web at www echo usa com For the name of the Shindaiwa dealer nearest you call 1 877 986 7783 or on the web at www shindaiwa usa com Guide Bar Low kickback Replacement guide bars The following guide bars may be considered to have equivalent kickback energy Sprocket nose guide bars of the same length and nose radius same pitch and having the same number of teeth Hard nose gu...

Page 43: ... can result Your unit is designed to provide many hours of trouble free service Regular scheduled maintenance will help your unit achieve that goal If you are unsure or are not equipped with the necessary tools we recommend that you take your unit to a Servicing Dealer for maintenance To help you decide whether you want to DO IT YOURSELF or have the Dealer do it each maintenance task has been grad...

Page 44: ...ly Or Before Use Air Filter Inspect Clean 1 Automatic Oiler Inspect Adjust 1 Oil Filter Inspect 1 Fuel System Inspect 1 Guide Bar and Sprocket Nose Inspect Clean 1 Saw Chain Inspect Sharpen Replace Tensioning 2 Sprocket Inspect Replace 2 Cooling System Inspect Clean 2 Recoil Starter Rope Inspect Clean 1 Screws Nuts Bolts Inspect Tighten Replace 1 Every Refuel Fuel System Inspect 1 Guide Bar and Sp...

Page 45: ...CEDURE NOTES Replacement is recommended based on the finding of damage or wear during inspection Air Filter 1 Check before every use 2 CLOSE choke 3 Release air cleaner cover latch A 4 Pull air cleaner cover B back and up to remove Cylinder Exhaust Port Inspect Clean De carbon 2 Yearly Fuel Filter Inspect Replace 1 Fuel Cap Gasket Replace 1 COMPONENT OR SYSTEM MAINTENANCE PROCEDURE REQUIRED SKILL ...

Page 46: ...er latch Spark Plug 1 Check periodically 2 Remove air cleaner cover 3 Remove spark plug lead A 4 Remove spark plug B 5 Correct the spark gap if it is wider or narrower than the standard gap The standard spark gap is 0 65 mm 0 026 in Fastening torque 15 17 N m 130 145 lbf in Check Fuel System Check before every use After refueling make sure fuel does not leak from around fuel feed lines fuel gromme...

Page 47: ...e 4 Install the new filter with the reverse action 5 When the inside of the fuel tank is dirty rinse the tank out with gasoline to clean it 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...

Page 48: ...ove the oil cap B and pull oil filter A out through oil port and inspect filter 2 If the filter is dirty wash it in gasoline or replace it as follows 3 Do not remove the wire coil clamp to remove the oil filter A Pinch the filter with the fingers on one hand and the line with the other hand Pull and twist slightly to separate 4 Install the new oil filter A with the reverse action 5 When the inside...

Page 49: ...hen you install new chain Replace it if worn Some tree sap and resins are corrosive Thoroughly wash the guide bar and sprocket areas after each use then coat metal parts with light oil Cooling System Cleaning Check periodically Clogged fins will result in poor engine cooling 1 Remove the air cleaner cover the air filter and the spark plug lead 2 Remove the three bolts A from the cylinder cover 5 0...

Page 50: ...e C Spark Arrester Muffler The spark arrester muffler controls the exhaust noise and prevents hot glowing particles of carbon from leaving the muffler Make sure the spark arrester 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...

Page 51: ...ards 2 Remove the spark arrester screen bolt A and remove the screen B from the silencer 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 Note When cleaning carbon deposit be careful do not damage the catalytic element inside muffler Carburetor Adjustment Every unit is run at the factory and th...

Page 52: ...e 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 Idle Speed Adjustment Start engine turn Idle Speed Adjustment Screw T...

Page 53: ...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 Drive link serves to remove sawdust from the groove of the guide bar Keep the lower edge of the drive link sharp where indicated Top plate Side plate Depth Left han...

Page 54: ...position and correct angle use a file holder 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 One fifth of the file diameter remains above cutter edge Be sure to round off the front edge of the depth gauge Keep this angle 30 10 1 5 Depth gauge tool ...

Page 55: ...icient oil to it move the chain slowly to wash away the filings before using again If the chainsaw 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 To sharpen other chains follow chain manufacturer s instructions 70 Side plate filing angle 30 T...

Page 56: ...e too rich OPEN choke Clean or replace air filter Adjust carburetor See your dealer Spark at end of plug wire No spark STOP switch OFF Electrical problem Interlock switch Turn switch to ON See your dealer Spark at plug Incorrect gap Covered with carbon Fouled with fuel Plug defective Adjust to 0 65 mm 0 026 in Clean or replace plug Engine runs but dies or Engine does not accelerate properly Air fi...

Page 57: ...ous personal injury can result Inspect and adjust every part of the chainsaw Completely clean every part and repair if necessary Apply thin coating of oil on metal parts to prevent rust Remove chain and guide bar Engine runs but dies or Engine does not accelerate properly Spark plug Plug dirty or worn Normal wear Clean and adjust or replace Carburetor Improper adjustment Vibration Adjust Cooling s...

Page 58: ...enclosure where fuel fumes may accumulate or reach an open flame or spark 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 SPECIFICATIONS Model CS 4920 Length 437 mm 17 2 in Width 237 mm 9 3 in Height 298 mm 11 7...

Page 59: ...le automatic oiler Chain oil capacity 330 ml 11 16 US fl oz Starter system Automatic rewind starter Clutch Centrifugal type Sprocket type Spur type 7 tooth 0 325 in pitch Chain brake Manual and non manual band brake type Idle speed 3 000 RPM Clutch engagement speed 4 200 RPM Wide open throttle speed 12 500 RPM Chain tensioner Side access system Guide bar 16 18 20 in Saw chain 20BPX Standard featur...

Page 60: ...t 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 If you do not have access to the Internet you can complete the form below and mail to ECHO Incorporated Product Registration PO Box...

Page 61: ...CS 4920 PRODUCT REGISTRATION X7503352100 61 09 2022 ECHO Incorporated ECHO Incorporated ...

Page 62: ...NOTES CS 4920 62 X7503352100 09 2022 ECHO Incorporated NOTES ...

Page 63: ...CS 4920 NOTES X7503352100 63 09 2022 ECHO Incorporated ...

Page 64: ...ECHO INCORPORATED 400 Oakwood Road Lake Zurich IL 60047 www echo usa com C92115001001 C92115999999 ...

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