Stihl MS 440 Chainsaw: Verdugo FA Student Handout
Contents
1. A ee DISENGAGE CHAIN BRAKE MANUALLY Set tip of saw on ground finger off trigger release chain brake with free hand or Hold saw with both hands finger off throttle release chain brake with fingers by pulling hand guard back Demonstrate method to check automatic oilier SHUT OFF PROCEDURE Bring saw to idle Engage chain brake Move starting lever to STOP position RETURN SAW TO APPARA TUS Refill saw with fuel amp oil Lock throttle in open position Move master control lever to COLD START position MAINTENANCE amp CLEANING Check fluid levels daily Inspect saw for loose or damaged areas Start motors every Monday Clean after every use Change out parts as needed TROUBLE SHOOTING Saw not starting a Make sure saw is in the proper starting position b If flooded take out of choke position Pull Starter Check your atmosphere Smoke Spark plug fouled Black carbon Pre mix could be bad Aijr filter clogged Saw starts and stops gt a Clogged or dirty air filter b Carburetor jets out of adjustment Saw chain turns at idle gt a Clutch out of adjustment b LA low idle adjustment to high Dark exhaust gt a Too much pre mix in gas oae mh FACTOID Bioplus oil another form of bar oil is made with a vegetable oil base This means that the oil is less harmful to humans animals microorganisms and plants The oil also offers excellent flow characteristics at low temperatures and has a high flash point2. Stihl MS 440 Chainsaw Verdugo FA Student Handout Chainsaws are assigned to all truck companies brush crews and were S40 CALIFORNIA STATE FIRE MARSHAL needed This tool has many applications in the Fire Service The Stihl STEEL chainsaw is considered by many firefighters as the best saw for roof ventilation When equipped with a carbide tipped chain it is excellent for use on everything from lightweight roofs to older roofs with heavy construction and many layers of composition Unlike the rotary saw the chain saw in the hands of an experienced operator can be used to feel the structural members beneath the roof decking even though the rate of cutting speed is great The operator can safely work without random damage to rafters or joists This equates to greater safety for the operator and the remainder of the ventilation team Due to its lightweight the saw is good for use from roof ladders and in places that the heavier rotary saw wouldn t be safe Cuts can be made from perpendicular to the roof decking to 45 from the perpendicular without bind or stall 1 Carburetor Box Cover gt Houses the air filter assembly 2 Front Handle Handle bar for the left hand at front of saw 3 Front Hand Guard gt Provides protection against projecting branches and helps prevent the left hand from touching the chain if it slips off the handle bar 4 Carburetor Control Adjustment gt Controls the H high speed je
3. Rated by the Coordinating European Council to be 93 8 biodegradable in only 21 days Stihl MS 440 Chainsaw Probationary Question 3 What and or where is the gun sight on the saw FACTOID How to Measure Chain Pitch The PITCH of a chain refers to the distance between its drive links It is determined by measuring the distance between any three drive links and divided by two Example 3 4 divided by 2 3 8 Sometimes pitch is expressed as a fraction 3 8 and sometimes it is expressed as a decimal 404 The pitch of the chain the pitch of the drive sprocket and the pitch of the bar tip must all match The measurement itself is a factor that describes the size of the chassis of the chain Usually a larger pitch indicates a heavier and bigger chain The most common used by professionals in our market is 3 8 It offers good flexibility low weight adequate strength and good cutting speed when run on today s high RPM pro saws FACTOID Why Chain Gauge Is Important The gauge of a chain refers to the thickness of its drive links It is determined by measuring the portion of the drive link that fits into the groove of the guide bar It is usually expressed in thousandths of an inch 050 or 063 The gauge of the chain and the groove in the bar must match Gauge is also a factor that influences chain strength Thicker drive links are usually stronger But before you call to buy heavy gauge chain consider that gauge also a
4. ckback May occur when the upper quadrant of the bar nose is pinched unexpectedly unintentionally contacts solid material in the wood or is incorrectly used to begin a plunge or boring cut When a kickback occurs the guide bar may rotate around the front handle a The Quickstop will engage if there is enough inertial force acting upon it without physical contact or S q b Ifthe cutting position is such that the operator s left hand is gripping the front handle behind the hand guard and if the left hand rotates around the front handle and makes a sufficiently forceful contact with the front hand guard which is the Quickstop activating lever this contact will activate the Quickstop manually Pushback gt Occurs when the chain on the top of the bar is suddenly stopped when it is pinched caught or encounters a foreign object in the wood The reaction of the chain drives the saw straight back toward the operator and may cause loss of saw control Pushback frequently occurs when the top of the bar is used for cutting Pull ins gt Occurs when the chain on the bottom of the bar is suddenly stopped when it is pinched caught or encounters a foreign object in the wood The reaction of the chain pulls the saw forward and may cause the operator to lose control Typically occurs when the saw is not engaged at full throttle when entering a cut kse Q lt a Q gt Pull in Pushback Page 4 of 5 p
5. eeth on sprocket 5 25 5 25 x 14 000 saw RPM 73 500 inches per minute 73 500 divided by 12 6125 feet per minute 73 500 divided by 720 102 08 feet per second OO O00 O 0 Page 2 of 5 Stihl MS 440 Chainsaw Probationary question 1 What is the clear looking cap beneath the Oil Filler Cap CRITERIA FOR REMOVING CHAIN FROM SERVICE 1 3 or more damaged teeth in a row 2 6 or more damaged teeth total 3 Cracked broken tie straps CHAIN TENSIONING Disengage chain brake Drag top of chain freely across bar with rag or glove 3 Grasp bottom of chain pulling down exposing the bottom of one 1 complete drive link NO e Oilomatic Chain Lubrication System gt Lubrication System is an exclusive selling feature found on all Stihl saw chains The system features a specialty engineered groove through which oil is channeled to critical wear areas The groove picks up oil and channels it directly to the chain rivets This lengthens chain life since the rivets serve as bearings to the saw chain CHAINSAW STARTING PROCEDURES Shake saw to mix fuel and oil Engage manual chain brake hand guard forward Depress throttle trigger interlock Place master control lever in the cold start position Note if saw has been running use warm start position 5 Use one of three methods to pull starter cord until engine starts to fire or coughs a Ground Method r nr 1 Right hand cutter 4 Drive link 2 Preset tie
6. ffects the weight of the chain Weight affects performance and to maximize cutting speed weight should be kept to a minimum Like most things in life there are compromises Pro saw chain is no different The rule usually is Run the lightest gauge chain that stays together and gives you decent service life FACTOID Did you know that the filter within the fuel tank is called a CAPILLARY FILTER It s designed to absorb fuel and moisture and keep the saw running This means that the filter doesn t have to be submerged in fuel completely to keep the saw running It is an all position diaphragm Shown is a full compliment of tools for the K12 Partner Saw amp Stihl 440 Chain Saw carried in the United States Marine Corp USMC BLITZ can The top portion of the can carries 1 gal of pre mix The military carries the USMC BLITZ can in Hummers Besides having a few tools within they also carry an M9 Pistol for those sticky situations they need to get out of Page 5 of 5
7. hrottle Trigger Interlock Must be depressed before the throttle trigger can be activated Flywheel Cover gt Houses the spring loaded pawls that lock into the flywheel and covers the flywheel and magnetos Muffler gt Reduces engine exhaust noise and directs the exhaust gases FACTOID that the Stihl 440 Chainsaw can reach speeds of up to 45mph 20ms FACTOID Prolonged use of chainsaws or other types of tools that expose the operator to vibrations may produce whitefinger disease Raynaud s phenomenon or carpal tunnel syndrome FACTOID During probation you will be expected to know all of the information listed on this sheet and more Stihl MS 440 Chainsaw 14 000 RPM Oilomatic Chain Oilier 68 Pints Oil 1 69 Pints Fuel 50 1 Premix 13 lbs 5 2 hp 72cc 2 Stroke Engine 20 Sprocketed Guide Gar 3 8 P amp G Front Handle gt Handle for the left hand at saw 2 Twist Lock7 gt Lock for carburetor box cover 3 Master Control Lever Lever for choke control throttle run and stop switch positions 4 Rear Handle gt The support handle for the right hand located at or Gal GAY aitai toward the rear of the saw 1 Side Chain Tensioner Screw Permits precise adjustment of chain tension VOTE On Stihl 038 Magnums the CTS is on the front 2 Side Chain Tensioner Device gt Actual device that moves the guide bar 3 Bolts gt Along with hexagonal nuts that secure the chain sprocket cove
8. r along with the guide bar and oilomatic chain to the unit 4 Bar Oilier gt Supplies oilomatic chain with sufficient amounts of oil during operation 1 Spit Back Protector Element gt Sponge insert that prevents carburetor from saturating HD Filter Cleaned with mild soap and warm water then dried No need for diesel 2 Heavy Duty Filter gt Main filter for the unit cleaned the same as the SBPE 140 Micron rating 3 Pre Filter Element gt Outer most filter cleaned with soap amp warm water then dried no need for diesel 4 Carburetor Box Cover Houses the air filters and is the inlet into the carburetor e FACTOID Formula for Chain Speed Calculation o Take chain pitch and multiply x two o Multiply above number by number of teeth on sprocket of saw o Multiply that number by saw RPM o The number you get will be chain speed in inches per minute To convert to feet divide by 12 To convert to feet per second divide by 720 l Centrifugal Clutch gt Engages when centrifugal forces overcome the 1 spring loaded shoes at 3300rpm which grabs the clutch drum which drives the chain sprocket rim type and turns the oilomatic chain 2 Houses chain brake system too 2 Chain Sprocket Assembly Consists of 1 clutch drum 2 chain sprocket 3 washer and 4 e clip VOTE Chain Sprockets come in two types Rim amp Spur Example 3 8 chain with 7 tooth sprocket 3 8 x 2 3 4 or 0 75 0 75 x 7 number of t
9. strap 5 Left hand cutter with rivets 6 Tie strap 3 Rivet Three types of Chains 1 Carbide Tipped gt The standard chain used by the GASFA It is known as the Rapid Duro Life expectancy c Drop Method Not recommended by the manufacturer most commonly used in the lt 10x1 h onal Fire Service nee econ neon 6 Move starting lever to WARM START position chains Work by chipping the wood out l continue pulling rope until engine starts 2 Bullet Chain gt Operates on the filing principal i F 8P p 7 When engine starts release throttle lock immediately It is less efficient and more costly 3 Standard Chain Also known Fee ae Sin Contele as Rapid Micro Used for Fe N E eee ae be I Coig start saws without automatic choKxe tr a 1 ni n g O n ly DE Seneca seas acai ee a SENSES IED eS ee ee Se ee ee 1 oS chew ea Wi eda Bess me eee p aR glee i j Hg i Page 3 of5 F RL OFT eN EJ A A D ie yp Vi va CALIFORNIA STATE FIRE MARSHAL Kickback Stihl MS 440 Chainsaw Probation questions 2 What does the Green and Yellow Sticker on the Saws Front Hand Guard Stand mean TWO METHODS OF CHAIN BRAKE ENGAGEMENT Manually gt Quickstop engaged physically either by accident or purposefully would stop the chain Inertia Reactive Forces gt Where the saw moves with enough force to engage the Quickstop without physical contact REACTIVE FORCES Ki
10. t L low speed jet and the LA low idle jet One full turnout from bottom for quick adjustment Electronic Tachometer for accuracy 5 Chain Sprocket Cover gt Covers the clutch and the sprocket 6 Side Access Chain Tensioner gt Allows saw oilomatic chain to be adjusted through the sprocket cover 7 Bumper Spike Toothed stop for holding saw steady against wood 8 Guide Bar gt Supports and guides the saw chain 9 Oilomatic Saw Chain A loop consisting of cutters tie straps and drive links 10 Chain Catcher Helps to reduce the risk of operator contact by a chain when it breaks or comes off the bar 10 11 12 Page l of 5 il T1000 M S MOT Oi X D PRI IA ul Spark Plug Boot gt Connects the spark plug with the ignition wire Starter Grip The grip of the starter for starting the engine Oil Filler Cap For closing the oil tank Flywheel Consist of opposing magnetos which create the electrical charge for combustion and tines which blow air up and through the cooling fins of the cylinder head to cool the motor during operation Magneto Stationary magnet that carries the electrical charge 40K volts to the spark plug via the ignition wire Fuel Filler Cap For closing the fuel tank Throttle Trigger gt Controls the speed of the engine Rear Hand Guard Gives added protection to operator s right hand Rear Handle The support handle for the right hand located at or toward the rear of the saw T
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