Group A: Mobile Plant Equipment
Core knowledge for mobile plant
Group A covers excavators, loaders, dozers, rollers, skid-steers and similar machines. You must understand pre-start and post-start inspections, fluid and tyre/track checks, safe operating envelopes, load charts and rated capacity, stability and centre of gravity, ground conditions and slope limits, exclusion zones and pedestrian separation, spotter and signal protocols, and shutdown/parking procedures. Know the difference between a service brake, park brake and retarder, and why articulation, oscillation and counterweight affect tipping.
Traps in questions
Distractors often suggest travelling with a raised bucket or load, slewing over people, or using the bucket as a work platform - all wrong. Another trap is the travel direction on slopes: on most rubber-tyred loaders the loaded bucket is kept low and uphill, but the exact rule depends on machine type, so read what the stem specifies. Watch for questions about seat belts and ROPS/FOPS: they are required whenever the machine is fitted with them, even for short moves. Ground pressure and soft ground questions often hide the correct answer in "reduce load or use mats", not "drive faster".
Worked example
A loader must descend a ramp with a full bucket. Rule of thumb: keep the load low, travel in the correct gear for grade control, keep the heaviest end uphill, and maintain a spotter if visibility is restricted. If a question offers "raise the bucket for visibility", reject it - visibility does not override stability.
Rule of thumb
Low, slow and controlled: load low, speed low, and never move people or lift them with the bucket.