CDC 3e251 Set B Vol. 2

A tongue and drawbar connection is commonly used to tow equipment on a dozer. This type of connection involves a tongue, which is a horizontal bar attached to the front of the equipment being towed, and a drawbar, which is a vertical bar attached to the dozer. The tongue and drawbar connection allows for a secure and stable towing process, ensuring that the equipment being towed remains aligned and balanced with the dozer. This type of connection is especially suitable for smaller equipment and trailers.

Red is typically used to make changes to an as-built drawing. This is because red is a highly visible color that stands out from the original drawing, making it easy to identify the modifications. Additionally, red ink is commonly associated with corrections and revisions in many industries, including engineering and construction. Using red to mark changes ensures that they are clearly distinguishable and can be easily recognized by others who may need to review or work with the drawing.

To begin loading sand in a scraper, it is recommended to use the forward momentum of the scraper. This means that the scraper should be in motion while loading the sand, which helps in efficiently scooping and collecting the material. Starting with the blade in the dirt, loading on a slight upgrade, and loosening first with rippers are not described as proper procedures for loading sand in a scraper.

When aggregate blends of material are stockpiled in a cone-shaped mound, particle separation can occur. This means that the coarse and fine particles within the blend may separate and settle into different layers within the mound. This can lead to an inconsistent mixture of materials, affecting the quality and performance of the stockpiled material. Additionally, particle separation can also result in a reduced compaction ability of the material, as the separated particles may not interlock effectively. Therefore, stockpiling aggregate blends in a cone-shaped mound can lead to particle separation and negatively impact the overall quality and performance of the material.

When trenching and aware of the location of an obstacle, it is important to stay at least a foot away from it. This is necessary to avoid damaging the obstacle or causing any harm to oneself or others. By maintaining a safe distance, the risk of accidental contact or collision with the obstacle is minimized, ensuring a safe and efficient trenching process.

When the scraper leaves a cut, allowing it to travel a few feet before lifting the bowl to the carrying position helps to spread loose material piles in front of the bowl. This is important because it ensures that the material is evenly distributed and prevents any potential imbalances or uneven weight distribution in the bowl. By spreading the material piles, it also helps to maintain stability and control while carrying the load, reducing the chances of the scraper bouncing or becoming unstable during transportation.

When you pitch a grader's scarifier to the rear, the action that occurs is tearing. This means that the scarifier, which is a tool used for breaking up and loosening soil or pavement, is being tilted backwards. This action allows the scarifier to dig into the surface and tear it apart, creating roughness or texture. Tearing is often done to prepare the ground for further construction or to improve drainage.

When pushing material with a dozer, the added weight of the material on the dozer blade decreases the response time when using the blade-lift control. The weight of the material puts additional pressure on the blade, making it harder to lift and reducing the speed at which it can be raised or lowered. This added weight creates resistance and slows down the response time of the blade-lift control.

When making a rectangular-shaped excavation, it is important to plan the digging sequence to prevent working into positions where the machine cannot be repositioned. This is crucial because once the machine is in a certain position, it may not have the flexibility or maneuverability to reach certain areas of the excavation. By planning the sequence, the operator can ensure that the machine can access all necessary areas and avoid getting stuck or unable to reach certain spots. This helps to optimize efficiency and productivity in the excavation process.

The efficient operating range of a scraper is 300 feet. This means that the scraper is designed to work optimally within this distance. Operating the scraper within this range ensures maximum efficiency and effectiveness in its intended tasks.

If you move your trencher forward too fast while excavating a ditch, the trencher will stall. This means that the engine of the trencher will stop running, causing the machine to come to a halt. Moving the trencher too fast can put excessive strain on the engine, causing it to shut down in order to prevent damage. Therefore, it is important to operate the trencher at an appropriate speed to avoid stalling and ensure smooth excavation.

The AF Form 103 is a form specific to the United States Air Force and is not related to safety factors when loading materials with a backhoe. The other options listed are all safety factors that should be considered, such as ensuring proper placement of hooks, avoiding swinging the load too far to one side, and keeping everyone away from the suspended load.

When operating a scraper, it is recommended to enter the loading area at a controlled high return speed. This means that the scraper should be moving at a relatively fast pace while returning to the loading area. This allows for efficient and effective loading of materials onto the scraper. By maintaining a controlled high return speed, the operator can ensure that the scraper is able to quickly and smoothly navigate back to the loading area, minimizing downtime and maximizing productivity.

By making the fill high on the outside edges, it creates a barrier that prevents the scraper from sliding over the edge. This is important because if the scraper were to slide over the edge, it could cause uneven spreading of the materials and potentially lead to an incomplete or uneven compaction process. Therefore, by preventing the scraper from sliding, it ensures that the materials are spread evenly and allows for proper compaction to take place.

To ensure uniform compaction with the pneumatic tired-roller, it is important to maintain even tire pressure. This is because maintaining consistent tire pressure across all tires ensures that the weight distribution is uniform, resulting in even compaction of the material being rolled. Uneven tire pressure can lead to uneven weight distribution, which can result in uneven compaction and potential issues with the final quality of the project. Therefore, maintaining even tire pressure is crucial for achieving uniform compaction with the pneumatic tired-roller.

If the bucket stalls while excavating with a backhoe, raising the boom slightly can help to alleviate the issue. By raising the boom, the weight distribution of the backhoe is shifted, which can potentially free the bucket from any obstruction or resistance that may be causing it to stall. This adjustment allows for a change in the angle and position of the bucket, enabling it to resume excavation smoothly.

The PTO should not be engaged when no PTO-driven equipment is mounted to the tractor because there is no need for the PTO to be running if there is no equipment that requires its power. Engaging the PTO without any equipment can lead to unnecessary wear and tear on the PTO system and can also be a safety hazard as the rotating PTO shaft can pose a risk to individuals working around the tractor. Therefore, it is best to only engage the PTO when there is a need for it.

When operating a scraper on a rough haul road without a grader available, lowering the scraper bowl on the return trip to level the road is the correct action to take. Lowering the scraper bowl on the return trip helps to level the road, making it smoother for subsequent trips. This action helps to reduce the impact and vibrations on the scraper, improving its stability and preventing potential damage. It also ensures a safer and more efficient operation by providing a smoother surface for the scraper to travel on.

Driving the roller forwards prevents the drive wheel from pushing the asphalt up in front of the drum. By moving forward, the roller applies pressure on the asphalt, compacting it evenly and preventing it from being pushed up. This technique ensures a smooth and uniform surface.

Lowering the ripper teeth on a grader too much will cause the graders back end to raise. This happens because the ripper teeth are designed to break up hard soil or pavement, and when they are lowered too much, they exert excessive force on the ground. This force causes the back end of the grader to lift up, which can affect the stability and control of the machine.

If the dozer pushes too hard while loading a scraper, the scraper can jackknife. Jackknifing refers to the trailer of a vehicle swinging out to the side, causing it to lose control and potentially cause injury or damage. Therefore, pushing too hard can lead to dangerous situations and accidents.

The power of a winch on a dozer is typically rated based on the maximum pull exerted on its line. This refers to the maximum force that the winch can exert to pull or lift objects. The weight of the dozer, displacement of the motor, and size of the hydraulic pump may indirectly affect the winch's performance, but they are not direct indicators of its power.

To safely use a winch on a stationary dozer, it is important to align the dozer with the direction of the pull. This ensures that the force exerted by the winch is properly distributed and prevents any potential damage to the equipment or the winch itself. It also helps to maintain stability and control during the pulling process. Oiling the wire rope, setting the parking brake, and anchoring the dozer to another piece of equipment are not directly related to the initial step of aligning the dozer with the pull.

A dump truck should be positioned at a right angle to the stockpile because this allows for the most efficient and safe loading and unloading of materials. By positioning the truck perpendicular to the pile, it provides the driver with better visibility and maneuverability. This positioning also ensures that the materials are evenly distributed in the truck bed, preventing any potential imbalance or tipping during the loading process.

To regulate the depth of the cut with a grader, you need to adjust the position of the moldboard. By raising or lowering the toe of the moldboard, you can control how deep the cut will be. This adjustment allows you to achieve the desired depth for the cut, ensuring that the grading process is done accurately and efficiently. Leaning the front wheels or articulating the grader frame are not directly related to controlling the depth of the cut.

Sloping the bank of a ditch prevents the bank from crumbling. By creating a gentle slope, the soil on the bank is less likely to erode or collapse, ensuring the stability and integrity of the ditch. This is important for maintaining the functionality and effectiveness of the ditch in managing water flow and preventing erosion.

The correct answer is "the final step in road grading." This means that preparing the downward slope from the centerline to the shoulder of the road is the last task in the process of road grading. This step is typically done after other tasks, such as cutting the ditch line, have been completed. It is important to establish this slope to ensure proper drainage and to create a safe and functional road surface.

The attachment of a rear-mounted ripper to a dozer does not seriously affect the maneuverability of the dozer. This means that adding the ripper to the back of the dozer does not significantly impact its ability to move and navigate in different terrains. The dozer can still easily maneuver and perform tasks even with the ripper attached at the rear.

When removing a medium-sized tree, you would place your dozer blade as high as it will go. This is because you want to avoid cutting the roots of the tree with the dozer blade. Placing the blade as high as it will go allows you to safely remove the tree without damaging the roots or the ground.

To ensure a good sweeping pattern and avoid damage to equipment or bystanders, the broom pattern should be 2-3 inches wide. A wider pattern may be difficult to control and may not effectively sweep the desired area. A narrower pattern allows for more precision and control, ensuring that the sweeping is done properly without causing any harm or damage.

When picking up loose shale with a scraper on level grade, the blade should be positioned to follow the planes of lamination. This means that the blade should be aligned with the natural layers or bedding planes in the shale. By following these planes, the blade can effectively separate and lift the shale without causing excessive damage or disruption to the material. This technique ensures efficient and controlled removal of the shale while minimizing the risk of accidents or equipment damage.

When towing a sheepsfoot roller on a road, it is recommended to work the roller from the outside to the center. This means starting from the outer edges of the road and gradually moving towards the center. This technique helps to evenly compact the soil and achieve a smooth and uniform surface. By working from the outside to the center, the roller can effectively compact the entire width of the road, ensuring optimal results.

The most convenient way to mount equipment on an industrial tractor is with a three-point hitch. This type of hitch consists of two lower arms that attach to the tractor's rear axle and a top link that connects to the implement. It provides a secure and stable connection, allowing the equipment to be easily raised, lowered, and adjusted as needed. The three-point hitch is commonly used in agriculture and other industries that require frequent attachment and detachment of equipment.

The correct adjustment distance from the bottom of the straightedge to the top of the plate on a dozer track when checking tension is 1 to 1-1/2 inches. This means that the straightedge should be placed on the track and the distance between the bottom of the straightedge and the top of the plate should be within the range of 1 to 1-1/2 inches. This adjustment helps to ensure that the tension of the track is properly set for optimal performance and functionality of the dozer.

The self-propelled pneumatic roller has a watering system, which means it has the capability to spray water onto the surface being rolled. This watering system helps in compacting the material effectively by adding moisture and reducing the friction between the roller and the surface. It also helps in preventing the material from sticking to the roller drum. The 13-wheeled towed roller, on the other hand, does not have a watering system.

By adjusting the pitch of the grader moldboard, you change the cutting or dragging action of the cutting edge. The pitch refers to the angle at which the moldboard is positioned. When the pitch is increased, the cutting edge will have a more aggressive angle, resulting in a deeper cutting action. Conversely, when the pitch is decreased, the cutting edge will have a more shallow angle, resulting in a dragging action that is less effective for cutting through materials. Therefore, adjusting the pitch directly affects the cutting or dragging action of the cutting edge.

After using a scarifier and ripper, the next step you perform with a grader on a road project is to establish drainage. This is important to ensure that water does not accumulate on the road surface, which can lead to erosion and damage. By establishing proper drainage, the road can effectively handle water runoff and prevent any potential issues in the future.

To safely cross over a culvert with a dozer, a minimum of 12 inches of material must be covering it. This depth ensures that the dozer can safely traverse the culvert without causing any damage or disturbance to the structure. Anything less than 12 inches may pose a risk of the dozer's weight causing the culvert to collapse or get damaged, potentially leading to accidents or costly repairs.

When digging a basement, the first cut is made on the west line of the project. The starting point should be the northwest corner because the northwest corner is the point where the west line and the north line intersect. This ensures that the basement is aligned properly with the project and allows for accurate measurements and construction.

We use AF Form 1098 to document annual certification training.

Lowering the heel of the moldboard is necessary to have the material cut by a grader form a windrow. The moldboard is the curved metal plate located at the back of the grader blade. By lowering the heel of the moldboard, the material being cut is pushed towards the center of the blade, creating a windrow. This allows for efficient collection and removal of the material, making it easier to transport or dispose of. Raising the heel of the moldboard would have the opposite effect, spreading the material instead of forming a windrow.

The point of the V tread on the front grader tires should meet the ground last in order to make the tires last longer. By ensuring that the V tread touches the ground last, it helps distribute the weight evenly across the tire surface, reducing excessive wear and tear. This prevents premature tire damage and extends the lifespan of the tires, ultimately saving costs on replacing them frequently.

The rubber-tired excavator is a highly mobile piece of equipment because it operates with self-propelled wheel mountings. This means that it has the ability to move easily and quickly from one location to another without the need for additional transportation. The self-propelled wheels allow the excavator to navigate various terrains and access tight spaces, making it highly versatile and efficient for different construction or excavation projects.

The approximate diameter of an auger that is commonly used to dig postholes is 9 inches. An auger is a tool that consists of a helical screw blade, and it is commonly used in construction and gardening to dig holes in the ground. The diameter of the auger determines the size of the hole it can create, and a 9-inch diameter auger would be suitable for digging postholes of that size.

The secondary (inner) element of the air cleaner on a dozer should be changed once a year. This is a regular maintenance practice to ensure that the air cleaner is functioning effectively. Changing the secondary element helps to maintain proper air flow and filtration, which is important for the engine's performance and longevity. It is not necessary to change the secondary element every time the primary element is washed, as they serve different purposes. The primary element is typically changed when it becomes dirty or clogged, while the secondary element has a longer lifespan.

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Operating a dozer with tracks that are too tight can cause the engine horsepower to be reduced. This is because the tight tracks create excessive friction and resistance, making it difficult for the engine to generate power and transfer it to the tracks efficiently. As a result, the engine may struggle to deliver its full potential, leading to a decrease in horsepower.

The correct answer is the shoulder pick up. This term refers to the grading operation where material is spread away from the ditching operation and towards the middle of the road. This helps to create a slope or crown in the road, which promotes proper drainage and prevents water from pooling on the surface. By picking up material from the shoulder and redistributing it, the road becomes more level and even.

The most important part of changing the cutting edges on a bulldozer is making sure the cutting edges are blocked. This is crucial for safety reasons as it prevents the blades from accidentally moving or causing harm during the replacement process. Blocking the cutting edges ensures that they are securely immobilized, allowing the worker to safely remove and install the new cutting edges without any risk of injury.

Push-loaded scrapers should be loaded within a maximum stance of 100 feet. This means that the distance between the scraper and the material being loaded should not exceed 100 feet. This is important to ensure efficient loading and to prevent excessive strain on the equipment. Loading the scraper within this maximum stance allows for better control and maneuverability, reducing the risk of accidents and improving productivity.

To avoid leaving an edge when making the final leveling pass with a grader, you should lift the trailing edge of the blade. By doing this, the blade will not dig into the ground and create an edge. Lifting the trailing edge allows the blade to smoothly glide over the surface, ensuring a level finish without any ridges or edges.

When making a side-hill cut with a dozer, starting the cut straight down the hill is the correct approach. This allows for better control and stability while cutting through the slope. It minimizes the risk of the dozer tipping over or losing control on the uneven terrain. By starting straight down the hill, the dozer can maintain balance and effectively remove material from the slope without compromising safety.

The minimum slope ratio for berms is 1:1. This means that for every 1 unit of horizontal distance, there should be a 1 unit increase in vertical distance. This slope ratio ensures stability and prevents erosion of the berm. A steeper slope ratio would increase the risk of the berm collapsing or sliding, while a shallower slope ratio would not provide enough stability. Therefore, a 1:1 slope ratio is the minimum requirement for constructing berms.

A front end load bucket attached to an industrial tractor is best used for excavating light material. This means that the bucket is designed to efficiently and effectively dig up and move materials that are not too heavy or dense. It may be used for tasks such as moving soil, gravel, or loose debris. The design and capabilities of the front end load bucket make it ideal for this type of work, allowing for easy maneuverability and efficient excavation of lighter materials.

When cutting the back slope of a ditch with a grader, positioning the circle and blade inside the right rear tandem tire ensures that the material being cut flows towards the center of the ditch. This helps to create a smooth and even slope, as the material is pushed towards the center rather than being spread out or pushed away from the ditch. By keeping the material inside the right rear tandem tire, it can be efficiently moved and distributed, resulting in a well-formed and properly graded ditch.

Plowing or tilling the soil would require a thorough inspection to ensure the soil is properly prepared for planting or other agricultural activities. However, it would not require an AF Form 103, Base Civil Engineer Work Clearance Request, as this form is typically used for construction or excavation activities that may impact the infrastructure or utilities on the base.

A pair of auger flights is used to pull back the cuttings away from the ditch when using a trencher. Auger flights are spiral-shaped blades that rotate and dig into the soil, helping to remove the soil and debris from the trench. By using a pair of auger flights, the cuttings can be efficiently lifted out of the trench and deposited away from the ditch, allowing for a cleaner and more effective trenching process.

The mud hog and water hog are considered diaphragm pumps. Diaphragm pumps use a flexible diaphragm to create suction and discharge pressure, allowing them to handle thick and viscous fluids like mud and water. This type of pump is commonly used in applications where a high level of precision and control is required.

To achieve the best results when loading wet or sticky materials, it is recommended to bring the scraper tailgate forward by 1 foot each time. This allows for better control and prevents excessive material from sticking to the scraper. Bringing the tailgate forward by a shorter distance ensures that the materials are loaded evenly and efficiently, minimizing any potential issues or complications during the loading process.

Before making any grading cuts on a project, you examine hub stakes. Hub stakes are used to mark the exact location of the proposed structure or feature. They are typically set at key points along the centerline of the project, and they serve as reference points for grading and construction activities. By examining hub stakes, you ensure that the grading cuts are made accurately and in accordance with the project plans.

Some dozers may have control levers for tilt and angle in addition to the standard up-and-down blade controls. These levers allow the operator to adjust the tilt and angle of the blade to achieve precise grading and leveling. Tilt refers to the lateral movement of the blade, allowing it to be angled to the left or right. Angle refers to the vertical movement of the blade, allowing it to be tilted forwards or backwards. These additional control levers provide more flexibility and control over the dozer's blade, enabling the operator to perform more intricate tasks.

If the corner of the blade is repeatedly allowed to dig while removing rock with a dozer, it can cause the dozer engine to stall. This is because the excessive digging puts a lot of strain on the engine, causing it to lose power and eventually come to a stop.

A hub-stake on an excavation site indicates the exact position or elevation. It is used as a reference point to accurately measure and mark the location or height of certain features or structures during the excavation process. This helps ensure that the excavation work is done precisely according to the required specifications and coordinates.

Off-set stakes should not be disturbed while excavating a ditch because they are used to mark the location of objects or structures that are not directly in line with the centerline or slope of the ditch. These stakes are typically placed to indicate the position of utilities, such as pipes or cables, that need to be avoided or protected during the excavation process. Disturbing off-set stakes could lead to damage or disruption of these utilities, causing potential hazards or delays in the construction project.

In a diaphragm pump, the liquid is moved from the intake to the discharge valve through reciprocating motion. This means that the diaphragm of the pump moves back and forth, creating a suction force on one side and a pressure force on the other side. This reciprocating motion allows the pump to draw in the liquid through the intake valve and then push it out through the discharge valve. This type of motion is commonly used in diaphragm pumps to efficiently move liquids.

If you are ripping material and your dozer continually lags or stalls, reducing the number of teeth on the ripper can help alleviate the issue. Having fewer teeth will reduce the resistance and strain on the dozer, allowing it to operate more smoothly and efficiently. By reducing the number of teeth, the dozer will have an easier time penetrating and breaking up the material, preventing it from lagging or stalling.

A floating drawbar is a crossbar that is attached to the lower arms of a three-point hitch. This type of drawbar allows for vertical movement and flexibility, which helps to improve the stability and control of the implement being towed. By being fastened to the lower arms, it allows for better weight distribution and reduces the strain on the tractor's rear axle.

To activate the impactor on an excavator, the correct method is to depress the attachment control pedal. This action will trigger the activation of the impactor, allowing it to function properly.

The DoD/AF requires individuals operating on a flightline to have two types of certification: initial and periodic. Initial certification is obtained before starting the job and ensures that the individual has the necessary knowledge and skills to operate on a flightline. Periodic certification, on the other hand, is required at regular intervals to ensure that the individual's knowledge and skills are up to date and that they are still qualified to operate on the flightline.

When mixing bitumen with a grader, it is necessary to turn the material from one side of the road to the other a minimum of four times. This is important to ensure that the bitumen is evenly distributed and mixed thoroughly throughout the road surface. Turning the material multiple times helps to achieve a consistent and uniform mix, resulting in a better quality road construction.

To disengage the blade/swing interlock switch on an excavator, you need to lower the blade. This action will deactivate the interlock switch and allow the blade to move freely. It is important to lower the blade before attempting any other steps to ensure the interlock switch is properly disengaged.

The compactor attachment on an excavator helps seal the surface against the evaporation of internal moisture. This means that when the compactor is used, it helps to prevent the moisture within the compacted area from evaporating. This is advantageous because it helps to maintain the integrity and stability of the compacted area, as well as prevent any potential damage or deterioration that may occur due to the loss of internal moisture.

When building a V-shaped ditch with a dozer, it is recommended to line up the dozer 2 feet away from the construction stakes. This distance allows for enough space for the dozer to maneuver and create the desired shape of the ditch without causing any damage to the stakes or going off course. Being 2 feet away ensures accuracy and precision in the construction process.

The correct answer is 50 feet because side-by-side-dozing is a technique used for hauling materials with multiple bulldozers working together. It is most effective when the haul distance is longer, typically over 50 feet. This technique allows for increased efficiency and productivity by reducing the number of trips required to transport materials. Therefore, it is recommended to use side-by-side-dozing for hauls of at least 50 feet.