Tools, Equipment, and Maintenance
This domain tests safe selection, use, inspection, and maintenance of hand and power tools and small equipment. Expect questions on guarding, lockout, abrasive wheels, powder-actuated tools, compressed air, and routine maintenance that keeps equipment reliable.
Inspection and guarding
- Inspect tools before use: cords, plugs, guards, switches, hoses, and blades. Remove damaged tools from service.
- Guards stay in place. Never defeat an interlock or remove a guard for a quick cut.
- Disconnect power and lock out before changing blades, bits, or wheels, and before clearing jams.
- Match the blade or bit to the material and to the tool's rated speed.
Specific tool hazards
- Abrasive cut-off wheels: ring test before mounting, use the correct guard, never grind on the side of a cut-off wheel, and wear a face shield.
- Powder-actuated tools: only certified operators, inspect before use, wear eye and hearing protection, and never drive into a material that allows through-penetration.
- Gas-powered cut-off saws produce carbon monoxide; never run them in enclosed spaces.
- Compressed air must not be used on skin or clothing; it can force air into the body. Cleaning with air requires reduced pressure and PPE.
- Hand and power tools expose you to vibration, noise, and silica dust; use wet cutting, dust extraction, and hearing protection.
Maintenance and equipment care
- Follow the pre-use check and the scheduled maintenance: grease points, filters, belts, hydraulic hoses, and tire condition.
- Inspect hydraulic hoses for cracks, chafing, and leaks; a pinhole leak can inject fluid under the skin, which is a medical emergency.
- Store fuel safely, refuel with the engine off, and clean up spills immediately.
- Record maintenance and damage so the next crew knows the condition of the equipment.
Worked example
A gas cut-off saw is binding in a concrete cut. The operator shuts the saw off and lets the blade stop. The blade is inspected for damage and the correct blade for concrete is confirmed against the saw's rated speed. The guard is checked and the water supply is confirmed for dust control. The operator restarts outside the cut, lets the blade reach full speed, and finishes the cut wet. Any cracked blade is scrapped rather than reused.
Traps that cost marks
- Removing a guard to fit into a tight space.
- Using a cut-off wheel for side grinding.
- Skipping lockout when changing a blade because the job is small.
- Using compressed air on clothing to blow off dust.