Loader (Construction Equipment)
A front-bucket machine that scoops, carries and loads material.
Quick Answer
A loader is a construction machine with a large front bucket that scoops, carries and dumps soil, stone, aggregate and debris, usually into trucks or stockpiles. Wheel loaders, track loaders and skid steers are common types. In estimating a loader is an equipment line, priced by time, while the material it moves is measured in cubic yards.
The Full Picture
A loader moves bulk material. A wheel loader is the standard machine for loading trucks, feeding hoppers and managing stockpiles of aggregate, topsoil and spoil. A track loader works better on soft or uneven ground, and a skid steer handles smaller areas and attachments such as augers, forks and brooms. It is different from a bulldozer, which pushes material, and from an excavator, which digs.
A loader is not measured from the drawings. The estimator takes off the earthwork, which is cut and fill in cubic yards, stripping in square yards or cubic yards, base stone in tons or cubic yards, and spoil haul-off, then chooses equipment to do the work. The loader is then priced as equipment: rental or ownership rate, operator, fuel, delivery, and attachments, with its duration tied to the quantity of material it has to handle. A bucket's capacity is stated in cubic yards, but loose material swells, and the estimator works in bank cubic yards for the excavation and loose cubic yards for hauling.
Where it comes from: the civil grading plan, earthwork quantities summary, cut and fill sections and the geotechnical report all feed the volumes, and Division 31 specifications describe stripping, fill placement, compaction and import or export. Earthmoving machines such as loaders also fall under OSHA's material handling equipment rule, which includes brakes, horns, reverse alarms and guarding of hazards such as scissor points.
Pricing pitfalls: pricing the loader on the excavation quantity without allowing for swell; leaving out stockpile re-handling when the site has no room to load directly to trucks; forgetting that the loader sits idle when trucks are late; and pricing a machine that is too big to work in a tight site. Imported base stone and topsoil are bought by the ton or cubic yard, and the loader's cost is separate from that material cost.
Real Examples
Common Misconceptions
People assume: A loader and a backhoe do the same job.
Actually: A loader scoops and carries bulk material. A backhoe loader adds a rear digging arm and is used for small excavations. For high volumes, a dedicated loader or excavator is more productive.
People assume: Bucket size sets how many cubic yards the loader can move per hour.
Actually: Hourly production depends on cycle time, material, haul distance, truck availability and operator, so bucket capacity alone is not a production figure.
Frequently Asked Questions
What does a loader do on a construction site?
It scoops material with a front bucket and carries or dumps it, usually loading trucks, feeding hoppers, spreading stone and moving stockpiles. Wheel loaders, track loaders and skid steers are the common types.
How is a loader priced in an estimate?
As an equipment line: rental or ownership rate by hour, day, week or month, plus operator, fuel, delivery and attachments. Duration is based on the quantity of material handled and the contractor's own production assumption.
What units are used for loader work?
The material is measured in cubic yards (bank or loose) or tons. The machine itself is charged in hours, days or weeks. Keep bank and loose volumes separate when swell matters.
Which spec division covers the work a loader does?
Earthwork, including stripping, fill, compaction and import or export, is generally in Division 31. Check the project manual for the actual section numbers.