Questions and Answers
What should be done before moving a running saw?
How can the user check if the chain and bar are being properly oiled?
What is the first step in removing the cutting wheel?
What is the proper action to take after using the saw?
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What information must be included on the out-of-service tag when reporting a problem?
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What adjustment should be made if the chain tangs are almost out of the bar rails?
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Which saw has the same specifications for displacement and engine power?
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What is indicated by the chain functioning correctly if the saw is idling?
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What is the recommended procedure for warming up the saw?
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In maintenance reporting, what system is used to generate a Work Order Ticket?
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Which position should the master control lever be in when restarting a hot engine?
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What is the weight of the Stihl MS391 powerhead?
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How should the chain tension be adjusted?
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What is the maximum percentage of a saw blade that can remain before it should be replaced?
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How many carbide tips must be missing 50% or more for a blade to be replaced?
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Which of the following materials can not be cut using Composite Abrasive Wheels?
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What type of cutting is most diamond cutting wheels suitable for?
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Which marking indicates a diamond cutting wheel suitable for cutting both asphalt and concrete?
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What is the initial step before tensioning the ribbed V-belt?
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In which direction should the tensioning nut point while tensioning the ribbed V-belt?
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Which type of abrasive wheel is suitable for cutting iron?
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What is the purpose of cleaning the air filter in maintenance procedures?
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Which type of saw blade is suitable for cutting ductile cast pipes?
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Which item is not a part of the safety equipment listed?
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What is a recommended precaution before using a circular saw?
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Which task is a circular saw NOT typically used for?
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What can happen if the blade is moved into a cut too quickly?
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What should be done if a wheel shatters during operation?
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Which cutting operation involves removing security bars, roll-up doors, and reinforced windows?
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Which type of blade should always be used for optimal performance with a circular saw?
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What is a potential hazard caused by using a circular saw?
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What material should NEVER be cut with a saw due to safety concerns?
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What can kickback from a circular saw cause?
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What is the first step in replacing a chain on the saw?
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When adjusting the chain tension, what should you ensure before installing the side cover?
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What is the purpose of lifting up on the bar tip while turning the adjusting screw?
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What symptom indicates that a saw is possibly flooded?
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What position should the saw be set to when attempting to start a flooded saw?
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What procedure should be avoided when trying to start a flooded saw?
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After achieving the correct chain tension, what is the next step?
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What should be done to the chain after installing but before tightening the nuts?
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What happens if the chain is adjusted too tightly?
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Why is it important to check chain tension after the bar has cooled?
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Study Notes
Saw Operation and Warm-Up
- Begin by allowing the saw to idle on a pad or soft ground while monitoring its behavior.
- During warm-up, hold the saw with both hands and gradually rev it to full RPM two to three times.
- Verify proper operation of the chain brake before cutting.
- Check chain and bar oiling: rev the saw and observe for oil droplets on a light-colored surface.
- To shut off the saw, switch the master control to "stop" after idling.
- Restart a hot engine in the "run" position without choking if necessary; maintain master switch in "stop" when idle.
- Always engage the chain brake before moving a running saw.
Chain Brake Usage
- Engage the chain brake by pushing the black hand-guard towards the nose of the bar.
- Release the brake by pulling the hand-guard toward the hand-grip before cutting.
- The chain brake must be activated when the saw is stored to ensure safety.
Chain Tension Adjustment
- Regularly check and adjust chain tension using the tension-adjusting screw.
- For cold tension, ensure the chain is tight but does not bind; chain tie-straps should touch the bar rails.
- Adjusted warm chain tension should have the tangs halfway up the bar groove; verify tension after cooling for accuracy.
Chain Replacement Procedure
- Loosen bar retaining nuts and back off the bar adjusting screw to remove the chain.
- Ensure carbide teeth on the bar point towards the tip upon reinstalling.
- Adjust slack in the chain by turning the adjusting screw while lifting the bar tip.
- Secure connections by tightening the nuts while maintaining correct chain tension.
Flooded Saw Management
- A flooded saw indicates excess unburned fuel in the combustion chamber, making starting difficult.
- Position the saw in "run" and out of "choke," then have one person stabilize it while another pulls the starter rope with the throttle fully open.
Cut-off Saw Overview
- Circular saws are versatile, capable of cutting various materials with appropriate blades.
- Uses include ventilation, forcible entry, heavy rescue, and vehicle extrication.
- Before cutting, ensure sparks do not ignite flammable surroundings and inspect cutting wheels for defects.
Safety Precautions for Cut-off Saws
- Always operate with a safety guard and check for wheel integrity before use.
- Avoid cutting asbestos materials to mitigate health risks.
- Follow guidelines to prevent kickback, ensuring a high-speed blade is used.
Cutting Wheel Types
- Composite abrasive wheels can cut materials like asphalt and steel but cannot cut railway tracks.
- Diamond abrasive wheels excel in wet cutting for asphalt and concrete; different letters denote wheel types based on application.
Minor Maintenance Practices
- Clean the air filter regularly to prevent dirt from entering the intake area.
- Adjust the V-belt tension by loosening nuts, turning the nut clockwise, and then retightening.
- To change cutting wheels, use a locking pin for safety while loosening hexagon screws.
Inventory and Maintenance Reporting
- District saws are labeled with an Inventory Identification Number for tracking and maintenance.
- Maintenance involves generating a Work Order Ticket and attaching an Out of Service Tag with details of the problem and identification number.
Specifications for Stihl Chainsaws
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Stihl MS391 and MS362:
- Displacement: 3.9 cu in
- Engine Power: 3.3 kW
- Powerhead Weight: 13.67 lbs
- Fuel Capacity: 20.3 oz
- Chain Oil Capacity: 11.8 oz
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Description
This quiz covers essential chainsaw operation techniques, including warm-up procedures, chain brake usage, and chain tension adjustment. Participants will learn important safety protocols and maintenance tips to ensure safe and effective use of a chainsaw. Perfect for both beginners and experienced users.