Core Units: Safe Practice, Tools and Machinery Fundamentals
What the core units cover
Core units establish the baseline every agricultural mechanic must demonstrate regardless of specialty: workplace safety and risk control, manual handling, use of hand and power tools, workshop and field maintenance routines, basic welding and thermal cutting, small-engine fundamentals, and environmental and chemical stewardship. Questions test whether you can apply a procedure, not merely recall a label, so expect scenarios: a leaking hydraulic hose in a paddock, a tractor that must be locked out before a guard is removed, a two-stroke mix that will not start.
Concepts to master
Know the hierarchy of control and be able to rank controls: eliminate, substitute, engineer, administrate, then PPE last. Understand isolation and tag-out - de-energise, isolate, lock, tag, verify - and that removing a guard without isolation is never acceptable. Learn safe manual handling: assess the load, keep it close, bend the knees, avoid twisting, use mechanical aids. For tools, know the purpose and limits of each: a torque wrench is set and returned to zero; a cold chisel is never struck with a claw hammer; grinding wheels must match the machine's rated speed. For engines, know the four-stroke cycle and the difference between spark and compression ignition, plus fuel, air and cooling basics.
Traps that appear in questions
Distractors often place PPE first in the hierarchy, or describe "working carefully" as an adequate control. Another trap conflates isolation with simply switching off. Questions on two-stroke fuel ask for ratios and mixing order; questions on hydraulics ask about stored pressure and pin-hole leaks - never use a hand to search for a leak.
Rule of thumb
If a task requires reaching into a guarded or energised zone, the answer is stop, isolate, verify, then proceed.