LOS ANGELES COUNTY FIRE DEPARTMENT CONTEXT TRAINING PROGRAM ROTARY SAWS

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1 7 1. General Information The two (2) brands of rotary saws used by our Department are: a. The Husqvarna/Partner K-12FD b. The Homelite XL and MP Series

2 8 The Partner K-12FD differs from the Homelite series in engine size and drive belt tension adjustment although the control features are similar. The Partner K12FD can fit either the 12 or 14 diameter saw blades. The Homelite series use a 12 blade only. Both the Partner K-12FD and Homelite series 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. One 2.6 oz. bottle should be mixed with 1 gallon of gasoline prior to use. Both saws use a "V" type drive belt that needs no lubrication. These belts should be checked weekly and after each use. Replace belts when noticeably cracked and/or worn. The drive belt on the Partner K-12FD is maintained by a pressure spring. To set the tension, slightly loosen the bolts which secure the cutting head and the belt guard. Turn the tensioning screw located on the mounting arm clockwise to set the proper tension and re-tighten the bolts that hold the cutting head. Proper tension is set when the tension indicator nut aligns with the marks molded into the cutting arm. The drive belt tension on the Homelite XL and MP series is adjusted by loosening the drive-case cover nuts until finger tight (the arm must be free to move). Turn the adjusting cam so that it contacts the drive-case cover and moves the arm forward. Then turn the cam locking screw clockwise to lock the cam in place and re-tighten the drivecase cover nuts securely. Drive belts should be tight enough so that it does not slip at full throttle if the wheel becomes bound while cutting. The cutter head on both saws can be placed in an inboard or outboard position. All Operations Bureau rotary saws have a 1 arbor and use three (3) types of cutting blades available through the warehouse. a. Carbide tip saw blade designed for cutting wood and lightweight concrete roofs (blade shall be replaced when three (3) or more teeth are damaged and/or missing). Should only be used inboard. b. Abrasive disk designed for cutting concrete and masonry. c. Abrasive disk designed for cutting metal. Abrasive disks should be replaced when chipped and /or contaminated with fuel/oil. Note: Some units are supplied with diamond-tipped disks for USAR applications.

3 9 2. Daily check a. Check fuel level. b. Check and adjust drive belt as needed. c. Inspect and select proper cutting disk. d. Check and adjust cutting disk guard. e. Inspect overall saw condition (i.e. missing, loose, or damaged parts). f. Start/Run saw, 1-2 minutes. g. Top off fuel h. Wipe down saw 3. Starting the Rotary Saw a. Depress the compression release valve located on the top or left side of the engine if equipped b. Push the control switch/lever to the Run position. c. Pull the choke control backwards to the closed position. d. Set the throttle trigger lock by pressing the throttle catch on the side of the handle. e. Secure the saw and pull the starter cord with short, brisk pulls. f. When the engine starts, release throttle lock. g. Adjust the choke when the engine warms up. 4. Stopping the Rotary Saw a. Idle the engine to dissipate the engine heat. b. Pull the stop control backwards to the Stop/Off position. 5. Service for Rotary Saw a. Rotary saws in need of repairs are sent to the Small Engine Repair Shop at Pacoima. b. Contact the Small Engine Repair Shop for spare air-filters, spark plugs, and drive belts

4 10 RATERS ASSESSMENT QUESTIONS 1. All Department Rotary saws are powered by a engine. A. 2-cycle gasoline 2. What is the "premix" ratio for the Department Rotary Saws? A. 50:1 3. Where do you send a Rotary saw in need of repair? A. Small Engine Repair, Pacoima 4. What is used to lubricate the "V" type drive belt? A. none 5. The tension on the Partner K-12 Series saw drive belt is maintained by a A. pressure spring 6. The cutting disks for the rotary saw use a size arbor. A. 1" 7. The Homelite XL Series saws use a diameter cutting disk. A. 12" 8. How often should rotary saw fuel be changed? A. every 3 months 9. The carbide tipped blade should only used in the. A. Inboard position 10. Name the cutting disks used with the rotary saws. A. Carbide tipped blade, Abrasive concrete cutting and Abrasive metal cutting

5 11 ROTARY SAW NAME EMP# DATE WORK LOCATION BN STATION SHIFT OBJECTIVE: To answer general information questions about the rotary saw. To verbalize the changing of the saw blade. To demonstrate belt adjustment and starting the saw. EQUIPMENT: Rotary saw, equipment pouch and full turnouts including gloves, goggles and hearing protection. DESCRIPTION OF EVOLUTION: Given: Wearing Personal Safety Equipment, rotary saw will be set on the ground. 1. Answer general question about the rotary saw. 2. Verbalize changing a saw blade. 3. Demonstrate belt adjustment. 4. Demonstrate the ability to safety start and operate the saw. INDIVIDUALS NOT MEETING THE INDIVIDUAL SKILLS STANDARD WILL REQUIRE ADDITIONAL TRAINING IN THAT SKILL. INDIVIDUAL HAS MET THE STANDARD: YES NO COMMENTS: 1. Answer general questions about the saw. 2. Verbalize changing a saw blade. 3. Demonstrate belt adjustment. 4. Demonstrate starting the saw. 5. Demonstrate safe operation procedures throughout the evolution. RATER