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HomeMy WebLinkAbout309.005 - STIHL MS 462 C-M R Chain Saw TRAINING AND EQUIPMENT MANUAL 309 POWER SAWS 309.005 STIHL MS 462 C-M R CHAIN SAW EFFECTIVE: OCTOBER 2020 Current Revision Date: 10/06/20 Next Revision Date: 10/29/25 Author’s Name/Rank: Robert J. Garcia, Engineer Review Level: 3 Administrative Support: Leslie Oulashian, Management Analyst II Section 309.005 Page 1 of 13 PURPOSE The purpose of this policy is to provide Fresno Fire Department (FFD or Department) members an outline on the care and use of the STIHL MS 462 C-M R chain saw. APPLICATION The STIHL MS 462 C-M R chain saw is one of the models carried on FFD Brush engines for use on vegetation fires. OPERATIONAL POLICY To reduce the risk of serious personal injury, all Department members shall wear appropriate personal protective equipment (PPE) to include, chaps (when used during a vegetation fire), proper eye protection, hearing protection, helmet, gloves, jacket, pants, and foot protection. Members shall not cut any materials with body “in line” with the guide bar. This may cause injury from the saw/debris or if kickback occurs. OPERATIONAL GUIDELINE The STIHL MS 462 C-M R chain saw should be carried with the brake engaged and the guide bar pointing rearward. PROCESS 1. Operating the STIHL MS 462 C-M R Chain Saw: Section 309.005 Page 2 of 13 a. Prior to starting the STIHL MS 462 C-M R chain saw, members should: i. Ensure secure and firm footing. ii. Engage the chain brake. iii. Depress the decompression valve. b. Start the saw: i. Cold Start: 1) Depress and hold the trigger lock out (1) and squeeze and hold the throttle trigger (2) while moving the master control lever (3) to the start position. (See Figure 1.) Figure 1 ii. Warm Start: 1) The master control lever (3) will automatically be in the run position if the engine is shut off. (See Figure 2.) Section 309.005 Page 3 of 13 Figure 2 2) Pull the starter rope grip quickly and allow the rope to rewind several times until the engine runs. 3) Do not pull the starter rope to full length. b. Shut off the Saw: i. Release the throttle trigger. ii. Move the master control lever (3) to the stop position. (See Figure 3.) Figure 3 Section 309.005 Page 4 of 13 2. Inspection Checks: a. Daily Checks: i. Check the fuel level. Add pre-mix fuel, if necessary. ii. Check the saw guide bar oil level. Add oil, if necessary. iii. Check the chain condition, tension, and proper direction of travel. iv. Make a visual check of the chain saw for loose fasteners and/or covers. v. Inspect the engine case for cracks and/or leaks. vi. Inspect the fuel tank and guide bar oil tank for cracks and/or leaks. b. Weekly Checks: i. Perform daily checks as listed. ii. Start the engine and check for smooth operation at all speeds. Let the saw run for at least one to two minutes until the engine is warm. Caution: Do not run the chain saw at full rpm without load for more than a few seconds or damage to the engine may occur. iii. Check to see if the saw guide bar is getting sufficient oil. iv. Place the chain saw on a firm surface. While the engine is at an idle, engage the chain brake. If the chain brake does not operate properly, place the chain saw out of service and have it repaired. 1) Notify the battalion chief through established procedures. v. After the chain saw has cooled down, check the chain tension and re-adjust, if necessary. vi. Inspect the starter rope for fraying, cuts, and security in the handle. Section 309.005 Page 5 of 13 vii. Refill fuel and guide bar oil, if necessary. c. Monthly Checks: i. Perform daily and weekly checks, as listed. ii. Set the choke. Inspect/clean air filter. 3. Fuel: The STIHL MS 462 C-M R chain saw utilizes a 2-cycle engine that requires a 50:1 fuel-oil mix. The 50:1 TruFuel is to be used to refuel the chain saw. The product comes premixed and is ordered from supply. a. When fueling: i. Allow the engine to cool before refueling. ii. Perform operations in a well-ventilated outdoor area on bare ground. iii. Remove fuel caps slowly. 1) A fuel geyser can occur when the engine is hot and the tank is opened while under pressure. It can also occur in hot environments, even when the engine has not been running. iv. Add fuel, as necessary. v. Wipe up any spilled fuel before starting the chain saw. vi. Start the engine at least ten feet away from the fueling area. 4. Bar Oil: Use the chain saw bar oil supplied. The oil control will be set at maximum oiling. a. Shut off the engine. b. Engage the chain brake. Section 309.005 Page 6 of 13 c. To adjust the flow: i. Turn clockwise to increase. ii. Turn counter-clockwise to reduce. 5. Guide Bar and Chain: a. Removing the guide bar and Chain (See Figure 4): i. Shut off the engine. ii. Unscrew the nuts (1). iii. Remove the sprocket cover (2). iv. Turn the side chain tensioner (3) counter clockwise until the tensioning gear (4) sits flush against the housing. v. Remove the guide bar and chain. Figure 4 b. Mounting the guide bar and chain (See Figure 5): i. Position the chain in the groove of the guide bar, starting at the tip. ii. Ensure the cutters in the groove on the top side of the guide bar face the tip of the bar. iii. Point the guide bar tip away from the chain sprocket (7). Section 309.005 Page 7 of 13 iv. Place the chain around the chain sprocket. v. Slide the bar (6) over the collar screws (5). vi. Fit the pin tensioning gear in the hole (8) of the guide bar. vii. Disengage the chain brake. Direct the drive links into the groove of the guide bar while turning the side tensioner clockwise until it stops. Figure 5 c. Tensioning the chain (See Figure 6): i. Fit the sprocket cover on the saw with nuts loose (1). ii. Lift the guide bar up. iii. Turn the side tensioner (2) clockwise to tighten the chain. 1) A properly adjusted chain will sit closely against the underside of the guide bar but can still be pulled easily along the bar by hand. Always wear gloves when handling the chain. 2) If the chain cannot be moved along the bar it is too tight. iv. Once the chain is properly tensioned, tighten the nuts clockwise until the sprocket cover is firmly attached. NOTE: Release tension on the chain after finishing work. The chain contracts as it cools and Section 309.005 Page 8 of 13 can cause damage to the drive shaft and bearings. Figure 6 d. Chain: Wood cutting chain. GAUGE 0.063". 3/8" Pitch. Chain out of service criteria. Any tie straps are broken or missing. Excessively dull chain. o If the chips from cutting are fine, more like saw dust than wood chips, the chain is likely dull and needs to be sharpened/replaced. e. Guide bar 25 inch bar. Flip the guide bar after each sharpening and each time the chain is changed. This will help reduce uneven wear. There is no top or bottom of the bar. It may be used in either orientation. Section 309.005 Page 9 of 13 Periodically clean the oil inlet hole, oil outlet channel, and bar groove. Periodically remove any metal burrs that develop along the guide bar with a flat file. Replace the guide bar if the burrs cannot be filed or if the guide bar becomes damaged. f. Cleaning the air filter: i. Shut the engine off. ii. Engage the chain brake. iii. Open the shroud locks by turning ¼ turn counter clockwise with the combination wrench. iv. Remove the shroud. v. Clean the area around the air filter with a damp cloth or soft brush. vi. Rotate the air filter a ¼ turn counter-clockwise by hand. vii. Remove the air filter. viii. Knock out dust and debris from the filter. ix. If the air filter is damaged, replace it. x. Spray the outside of the air filter with warm soapy water. xi. Rinse the filter from the inside out under warm running water. xii. Allow the air filter to air dry. xiii. After the air filter has dried thoroughly, push it into place by hand and rotate it clockwise until it engages in position. The “Stihl” logo should be horizontal. xiv. Place the shroud into position. Section 309.005 Page 10 of 13 xv. Tighten the shroud locks until an audible click is heard. 6. Stihl M-Tronic Engine Management System: The Stihl M-Tronic engine management system electronically controls the ignition timing and fuel metering in any operating condition, factoring in altitude and fuel quality. This system provides optimum performance, whether just beginning to work or resuming after a break. Manual carburetor adjustments are no longer required. The carburetor does not have adjusting screws. Refer to page 47 in the STIHL MS- 462 C-M Instruction Manual for calibrating the chain saw. 7. Seasonal Operations: a. Winter: The carburetor may ice up when the saw is used at ambient temperatures below 50 degrees. To prevent icing, the shutter must be converted to allow warm air from around the engine to heat the carburetor. Use at higher temperatures may cause the engine to overheat. (See Figures 7 and 8.) i. Shut off the engine. ii. Engage the chain brake. iii. Open the shroud locks by turning ¼ turn counter clockwise with the combination wrench. iv. Remove the shroud. v. Pull out the shutter (3). vi. Re-insert the shutter with the winter symbol points toward the chain saw (4). vii. Push the shutter into the slot until it stops. viii. Place the shroud in position. ix. Tighten the shroud locks until you hear an audible click. Section 309.005 Page 11 of 13 Figure 7 Figure 8 b. Summer: The shutter must be set to summer mode when working in temperatures above 50 degrees F. i. Shut the engine off. ii. Engage the chain brake. iii. Open the shroud locks. iv. Remove the shroud. v. Pull out the shutter. vi. Re-insert the shutter with the “summer” symbol points toward the chain saw (4). (See Figure 9.) vii. Push the shutter into the slot until it stops. Section 309.005 Page 12 of 13 viii. Place the shroud in position. ix. Tighten the shroud locks. Figure 9 INFORMATION 1. Stihl MS- 462 C-M R Specifications: 13.9 lbs 24.3 oz fuel tank 11.5 oz oil tank Please see the following links for more information: Stihl MS-462 C-M R Saw Overview Video Note: please note the saw in the video has a 32 inch bar and we carry a 25 inch bar. STIHL MS- 462 C-M R Instruction Manual Section 309.005 Page 13 of 13 DEFINITIONS In-line: Position of body when cutting. Stand to the left of the cut, outside of the cutting plane. Kickback: The sudden, upward motion of a chain saw’s guide bar, which is one of the most common causes of chain saw accidents. Fuel Geyser: The rapid, high energy, expulsion of fuel. It occurs when fuel in a closed system becomes superheated and pressurizes. CROSS-REFERENCES Training and Equipment Manual Section 309.001, Chain Saws Section 316.020, Service and Operate a Chain Saw