Chainsaw Operation and Safety Procedures

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What should be done before moving a running saw?

Engage the chain brake (correct)

Turn off the master control switch

Check the oil level

Rev up the saw to full RPM

How can the user check if the chain and bar are being properly oiled?

By inspecting the chain tension

By observing the saw's temperature

By checking the oil reservoir level

By revving the saw's RPM and looking for oil droplets (correct)

What is the first step in removing the cutting wheel?

Tighten the nuts

Loosen the hexagon head screw

Replace the front thrust washer

Place the locking pin through the bore (correct)

What is the proper action to take after using the saw?

Engage the chain brake and store the saw Signup and view all the answers

What information must be included on the out-of-service tag when reporting a problem?

Location of the asset Signup and view all the answers

What adjustment should be made if the chain tangs are almost out of the bar rails?

Adjust the chain tension Signup and view all the answers

Which saw has the same specifications for displacement and engine power?

Stihl MS391 and Stihl MS362 Signup and view all the answers

What is indicated by the chain functioning correctly if the saw is idling?

Oiling is adequate when droplets are visible Signup and view all the answers

What is the recommended procedure for warming up the saw?

Let the saw idle on a pad or hold it with both hands Signup and view all the answers

In maintenance reporting, what system is used to generate a Work Order Ticket?

Vector Signup and view all the answers

Which position should the master control lever be in when restarting a hot engine?

Run position Signup and view all the answers

What is the weight of the Stihl MS391 powerhead?

13.67 lbs Signup and view all the answers

How should the chain tension be adjusted?

Turn the tension-adjusting screw clockwise Signup and view all the answers

What is the maximum percentage of a saw blade that can remain before it should be replaced?

80% Signup and view all the answers

How many carbide tips must be missing 50% or more for a blade to be replaced?

6 or more tips Signup and view all the answers

Which of the following materials can not be cut using Composite Abrasive Wheels?

Steel Signup and view all the answers

What type of cutting is most diamond cutting wheels suitable for?

Wet cutting only Signup and view all the answers

Which marking indicates a diamond cutting wheel suitable for cutting both asphalt and concrete?

BA Signup and view all the answers

What is the initial step before tensioning the ribbed V-belt?

Loosen the nuts Signup and view all the answers

In which direction should the tensioning nut point while tensioning the ribbed V-belt?

Towards the 0 Signup and view all the answers

Which type of abrasive wheel is suitable for cutting iron?

Diamond Abrasive Wheels Signup and view all the answers

What is the purpose of cleaning the air filter in maintenance procedures?

Prevent dirt from entering the intake area Signup and view all the answers

Which type of saw blade is suitable for cutting ductile cast pipes?

Composite Abrasive Wheels Signup and view all the answers

Which item is not a part of the safety equipment listed?

Safety goggles Signup and view all the answers

What is a recommended precaution before using a circular saw?

Examine the cutting wheel for cracks Signup and view all the answers

Which task is a circular saw NOT typically used for?

Tree pruning Signup and view all the answers

What can happen if the blade is moved into a cut too quickly?

The blade may shatter Signup and view all the answers

What should be done if a wheel shatters during operation?

Carefully examine the wheel guard for damage Signup and view all the answers

Which cutting operation involves removing security bars, roll-up doors, and reinforced windows?

Forcible entry Signup and view all the answers

Which type of blade should always be used for optimal performance with a circular saw?

High speed blade Signup and view all the answers

What is a potential hazard caused by using a circular saw?

Fire from sparks Signup and view all the answers

What material should NEVER be cut with a saw due to safety concerns?

Asbestos wrapped pipes Signup and view all the answers

What can kickback from a circular saw cause?

Hazardous injury Signup and view all the answers

What is the first step in replacing a chain on the saw?

Loosen bar retaining nuts with the appropriate tool. Signup and view all the answers

When adjusting the chain tension, what should you ensure before installing the side cover?

The bar adjusting pin is engaging the bar properly. Signup and view all the answers

What is the purpose of lifting up on the bar tip while turning the adjusting screw?

To take up slack in the chain. Signup and view all the answers

What symptom indicates that a saw is possibly flooded?

Fuel or liquid coming out of the muffler. Signup and view all the answers

What position should the saw be set to when attempting to start a flooded saw?

Run position. Signup and view all the answers

What procedure should be avoided when trying to start a flooded saw?

Pulling the starter rope too quickly. Signup and view all the answers

After achieving the correct chain tension, what is the next step?

Tighten the nuts to secure the bar. Signup and view all the answers

What should be done to the chain after installing but before tightening the nuts?

Check for proper teeth engagement. Signup and view all the answers

What happens if the chain is adjusted too tightly?

The chain cannot be moved back and forth freely. Signup and view all the answers

Why is it important to check chain tension after the bar has cooled?

Cool chains can be tensioned accurately. Signup and view all the answers

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

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

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

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.