LOS ANGELES COUNTY FIRE DEPARTMENT

1 LOS ANGELES COUNTY fire DEPARTMENT CONTEXT TRAINING PROGRAM FEBRUARY LOS ANGELES COUNTY fire DEPARTMENT CONTEXT TRAINING PROGRAM POWER EQUIPMENT 2 3 LOS ANGELES COUNTY fire DEPARTMENT CONTEXT TRAINING PROGRAM CHAIN SAWS 1. general information The following two (2) models of Stihl chain saws used by our DEPARTMENT are: a.

2 Stihl 038 b. Stihl 044 Both the 038 and 044 models are powered by a 2-cycle gasoline engine . Lubrication of the engines is accomplished by "premixing" the gasoline with a lubricating oil. The Stihl 50:1 lubrication premix used by the DEPARTMENT is available from the warehouse and should be mixed with 1 gallon of gasoline prior to use. Both saws have a 20" rollermatic bar that are equipped with an automatic chain oiler. To maintain correct chain lubrication, the oil quantity control bolt located on the bottom of the crankshaft should be preset to the maximum feed setting.

3 The carbide chain used with the saws have 33 carbide tipped cutting teeth and 66 drive teeth. Chains must be replaced when three (3) consecutive or six (6) total teeth are damaged or missing. To check the chain tension, set the run switch to the off position. With a gloved hand, pull the chain along the bar, the chain should feel snug to the bar and will pull with minimal effort. To adjust the chain tension, the mounting nuts on the guide bar should be finger tight. Hold the bar nose up and turn the guide bar adjuster screw to take out the slack.

4 After making the adjustment, recheck the tension by the same method. On the model 038, the adjuster screw is located in front of the engine block next to the guide bar. On the model 044, the adjuster is located on the side between the bar nuts. 4 LOS ANGELES COUNTY fire DEPARTMENT CONTEXT TRAINING PROGRAM CHAIN SAWS 2.

5 Daily check a. Check fuel level. b. Check and fill bar oil reservoir. c. Inspect and clean air filter. d. Inspect and clean cooling fins. e. Inspect and clean drive gear. f. Inspect and clean guide bar and roller tip. g. Inspect and clean chain. (soak chain in 30 wt. oil prior to reinstallation). h. Check chain tension. 3. Starting Procedures a. Engage the chain brake. b. Set the stop switch to the "on" position. c. Set the choke to the "full" throttle position. d. Set and lock the throttle trigger.

6 E. Anchor the saw firmly and pull the starter cord. f. Once engine starts, release the throttle trigger. g. Adjust the choke back to full open. h. While the engine is running, disengage chain brake saw, check the function of the chain oiler by holding the tip of the guide bar close to the ground or a piece of cardboard. A thin line of oil should appear when operating the saw at full throttle. i. While the engine is running, check the function of the saw chain brake.

7 1. Push the chain break forward and the chain should stop rotation. 2. Pull the chain brake back towards the handle and the chain should rotate freely. NOTE: Do not operate the saw at full throttle with the chain brake engaged as it is possible to damage the saw. 4. Stopping procedures a. Idle the saw to dissipate the heat. b. Switch the control switch to "off" or "stop". 5 LOS ANGELES COUNTY fire DEPARTMENT CONTEXT TRAINING PROGRAM RATERS ASSESSMENT QUESTIONS CHAIN SAWS 1.

8 All DEPARTMENT Chain saws are powered by a engine . A. 2-cycle gasoline 2. What is the "premix" ratio for the Stihl Saw using the special prepackaged oil? A. 50:1 3. The carbide chain used with the saws have carbide tipped cutting teeth and drive teeth. A. 33 carbide tipped cutting teeth. B. 66 drive teeth. 4. True or False - To dissipate heat, idling all chain saws prior to stopping is necessary. A. 50:1 5. What is the size of the chain saw bar? A. 20" bar 6.

9 The cutting chain on all models must be replaced when are damaged or missing. A. 3 consecutive or 6 total teeth 7. True or False Chain tension should be checked with a gloved hand. A. True 8. Do not operate the saw at full throttle with the engaged as it is possible to damage the saw. A. Chain Brake 6 L0S ANGELES COUNTY fire DEPARTMENT CONTEXT TRAINING PROGRAM CHAIN SAW NAME EMP# DATE WORK

10 LOCATION BN STATION SHIFT OBJECTIVE: To answer general information questions about the chain saw. To verbalize the changing of the saw chain. To demonstrate chain adjustment and starting the saw including operation of the chain brake. EQUIPMENT: Chain saw, Equipment pouch and Full turnouts including gloves, goggles and hearing protection. DESCRIPTION OF EVOLUTION: Given: Wearing Personal Safety Equipment. Chain saw will be set on the ground.