CSCS Tractor/Dozer key terms

Removing topsoil and vegetation from an area before earthworks begin, usually stockpiling the material separately so it can be reused later for reinstatement or landscaping.

The finished level of the ground after excavation or filling, on which subsequent layers such as sub-base or a working platform will be placed.

A sloping face of ground cut or built during earthworks, described by its angle or ratio, used to keep excavation sides and embankments stable.

Stepping a slope or excavation side into a series of horizontal and vertical faces to reduce the risk of collapse and to control material falling onto people below.

A temporary heap of stripped topsoil kept for later reuse, sited away from traffic routes and drainage, and often seeded or covered to limit dust and erosion.

The designated path that dump trucks and dozers follow across a site, planned to control dust, keep loads stable and separate plant from people on foot.

The ability of the ground to support the weight of a machine and its load without excessive settlement or failure, which determines whether a dozer can safely work there.

Soil or fill too weak to reliably carry a tracked machine, often indicated by standing water, rutting or spongy response, requiring assessment before entry.

Soil such as clay that holds together when moist and sticks to itself, behaving differently from granular material when cut, loaded and compacted.

Soil such as sand or gravel made of loose particles that drains freely but has little cohesion, so it tends to slump and can flow when saturated or disturbed.

The resistance of a cut face, stockpile or embankment to sliding or collapse, affected by soil type, water content, height, surcharge and vibration from plant.

The load a machine imposes per unit area of track or tyre contact with the ground, which determines how well it performs on weak soils.

A tracked or wheeled machine with a front-mounted blade used to push soil, clear vegetation and level ground, often with a rear ripper for loosening hard material.

A dozer running on continuous tracks rather than wheels, giving low ground pressure and high traction for pushing loads on soft or uneven ground.

One of the steel plates bolted to the track chain of a crawler machine, providing grip and spreading load; worn or missing shoes reduce traction and stability.

The tracked running gear of a crawler machine, including track chains, rollers, idlers and sprockets, which wears with use and must be inspected before work.

A rear-mounted toothed attachment on a dozer used to break up hard ground, rock or compacted layers before the blade pushes the loosened material.

The main front attachment of a dozer that cuts and pushes soil; its type, such as straight, universal or angle, changes how it handles different materials.

The check of a machine carried out before each shift, covering fluids, leaks, tracks, guards, lights, alarms and controls, with faults recorded and reported.

A written record of a fault found on a machine, describing what is wrong and when it was found, so it can be repaired and the machine kept out of service if unsafe.

Making a machine safe for maintenance by shutting it down, applying the parking brake, lowering attachments and locking off energy sources before anyone works on it.

Transferring fuel to a machine, done with the engine off, in a controlled area with spill kit and fire extinguisher available, avoiding hot surfaces and ignition sources.

A structure fitted to a machine to protect the operator if it overturns, and which must be undamaged and correctly fitted for the machine to be used.

The restraint worn by the operator while the machine is working; it keeps the operator inside the protective structure during a tip or sudden impact.

The ability of a machine to resist tipping, affected by slope, load on the blade, speed, ground conditions and how the machine is operated.

The point through which the machine's weight acts; raising the blade, carrying a load or working across a slope moves it and can reduce the margin against tipping.

Ground that falls away to one side of the machine, which is more hazardous than working straight up or down because the tip margin is reduced.

An area around a machine that the operator cannot see from the seat, which must be checked before moving and kept clear of people on foot.

A marked area around working plant that people on foot must not enter, sized to allow for the machine's reach, movement and any material it may throw or drop.

A trained person who guides a machine operator by agreed signals when visibility is restricted or space is tight, staying in sight and outside the machine's path.

A site plan setting out routes, crossings, speed limits and segregation between vehicles, plant and pedestrians to control interaction and prevent collisions.

The method of cutting and pushing soil with a dozer, such as slot dozing or downhill pushing, chosen to move material efficiently without losing traction or control.

A technique where the blade works in a channel cut by previous passes, so the soil walls keep the load together and more material is pushed per pass.

Controlling airborne dust from earthworks by damping surfaces, reducing drop heights, limiting speed and using water carts or sprays as conditions require.

A permeable barrier placed along the downslope edge of works to trap sediment from runoff while letting water through, protecting drains and watercourses.

A stocked set of absorbent materials and containment items kept available for fuel, oil or hydraulic fluid leaks, so a spill can be contained and cleaned up quickly.

Ear defenders or plugs worn in noisy areas; machine cabs and dozer work can exceed safe noise levels, and the need is decided by assessment and signage.