CSCS 180° Excavator key terms

A briefing given before work starts that explains the site's hazards, rules, traffic routes, emergency arrangements and who to report to. No one should begin work on a site without one.

A marked area around the machine that keeps people on foot out of reach of the bucket, counterweight and any swinging or falling loads. Only the operator and authorised signallers may enter it.

The agreed actions when something goes wrong, such as fire, a buried service strike, a collapse or an injury. It covers how to stop the machine safely, raise the alarm and reach the assembly point.

Any underground pipe, cable or duct such as gas, water, electricity or telecoms. Services must be located and marked, and a safe digging method agreed, before excavation starts.

A handheld device that detects buried cables and pipes by picking up their electromagnetic signal. It is used with up-to-date service plans and never replaces careful hand digging near marked services.

A small hole dug carefully by hand to confirm the exact position and depth of a buried service before machine digging approaches it. It turns a line on a plan into a known location.

Making a machine or system safe by cutting off its power or energy source and locking it off so it cannot be restarted. It is done before maintenance, inspection or clearing a blockage.

The clothing and equipment worn to reduce injury risk, typically a hard hat, high-visibility clothing, safety boots, gloves, eye protection and hearing protection. It supplements safe working, not replaces it.

Lifting, carrying or moving a load by hand or bodily force. On an excavator, it includes handling buckets, pins, attachments and grease containers, and should be avoided or reduced wherever possible.

A systematic visual inspection of the machine before use, covering structure, tracks, hoses, pins, guards, fluids, lights and safety devices. Defects are recorded and reported, and serious ones mean the machine stays out of service.

The record on which the operator notes the results of the pre-use inspection, including any defects found and any action taken. It provides evidence the machine was checked before use.

The process of recording and passing on any fault found on the machine to the responsible person, and ensuring it is repaired before the machine is used again if the fault affects safety.

Confirming that engine oil, coolant, hydraulic oil and fuel are at the correct levels, using the machine's dipsticks, sight glasses or gauges. Checks are done with the machine level and the engine stopped as specified.

The amount of slack in the rubber or steel tracks. Correct tension keeps the tracks seated on the rollers and sprockets; too loose and they can derail, too tight and they wear rapidly.

The tracked running gear of the machine: tracks, rollers, idler, sprocket and frame. It carries the machine's weight and must be inspected for wear, damage and correct tension.

A flexible reinforced hose carrying pressurised oil between the pump, valves and rams. Hoses are checked for chafing, bulges, leaks and cracks, and a pinhole leak can inject oil through skin.

A control lever or switch that renders the machine's hydraulic and travel controls inactive, so movement cannot occur accidentally. It is engaged whenever the operator leaves the seat.

The arrangement linking joysticks or levers to machine functions, such as ISO or SAE layout. The operator must confirm which pattern is set before operating, because a different layout causes unexpected movement.

The manufacturer's document giving the machine's limits, controls, maintenance intervals and safe operating procedures. It is kept with the machine and consulted for capacities, settings and checks.

A device that lets the operator couple and uncouple buckets and attachments without leaving the cab on some types, or with minimal manual work. It must be correctly engaged and visually confirmed before use.

The steel pin that secures the bucket or attachment to the dipper arm and linkage. It must be fully home, with its retaining clip or pin fitted, or the bucket can detach in use.

The machine's resistance to tipping. It depends on the machine's position, ground bearing strength, track width, boom and bucket position, load weight and any slope or soft ground under the tracks.

The manufacturer's table giving the maximum safe load at specified boom, arm and bucket positions, usually reduced as the load is held further out. It must be followed whenever the machine is used for lifting.

A designated, rated attachment point on the bucket, quick hitch or machine used for slinging a load. Lifting from an unrated point or from the bucket teeth is unsafe and not permitted.

A trained person who attaches and controls loads and communicates with the operator by agreed hand signals, radio or other means. The operator follows their signals and stops if communication is lost.

An agreed set of arm and hand movements used to direct machine movements when radio is unavailable or as a backup. Both operator and signaller must use the same recognised signals.

A hydraulically extended leg or blade that widens the machine's support base and improves stability. It must be fully deployed on firm ground before lifting or working at maximum reach.

The load the ground can support without settling or collapsing. Soft, made-up or recently disturbed ground may need spreader plates or a different position before the machine works or travels on it.

A rigid pad placed under tracks or outriggers to spread the machine's weight over a larger area. It reduces ground pressure on soft or weak surfaces and helps keep the machine level.

The planned path the machine takes across site, chosen to avoid overhead lines, excavations, soft ground, people and steep slopes. It is agreed with the site supervisor before moving.

An energised cable carried above ground on poles or towers. Keep the machine and any raised attachment well clear, treat the line as live, and never assume height or voltage from appearance.

Moving the machine up, down or across an incline. Travel straight up or down where possible, keep the bucket low, avoid turning on slopes, and never exceed the machine's rated gradient.

The ground area swept by the machine's upper structure, boom and counterweight as it turns. It must be kept clear of people and obstructions, and the operator must check it before slewing.

The heavy mass at the rear of the upper structure that balances the load on the bucket. Its tail swing can strike people or structures when the machine turns in a confined space.

A trained person on the ground who guides the operator when visibility is restricted, such as reversing or positioning near an edge. The operator stops if the banksman is not visible.

Shoring, trench boxes or battered sides used to prevent the sides of an excavation collapsing onto people. The operator must not dig where support is required or undermine existing supports.

The pile of excavated material placed beside the trench. It is kept back from the edge to avoid surcharging and collapse, and positioned so it does not obstruct routes or drainage.

A condition where a hydraulic ram reaches the end of its stroke or a load holds pressure in a line, causing the machine to stall or the hose to be stressed. It is avoided by smooth, planned movements.

The safe configuration at the end of work: machine on firm level ground, bucket or attachment lowered to the ground, controls neutral, lock-off engaged, parking brake on, engine stopped and key removed.

The final steps that prevent unauthorised use or movement after shutdown, including removing the key, locking the cab, engaging the lock-off and fitting any anti-theft device or immobiliser.

A walkaround after work to look for new damage, leaks, loose fittings or track problems, and to record anything found. It catches faults while they are fresh and feeds the next pre-use check.