Equipment Identification, Pre-Use Inspection, and Preventive Maintenance
Equipment Identification
Group machines by what they do
Questions in this domain are usually about matching a machine to a task and its cycle.
- Track dozer: pushes and rips; primary use is pioneering, bulk pushing, spreading, and backfilling. It is not a fine-grading or hauling machine.
- Wheel or track loader: loads trucks, stockpiles, and carries material short distances; bucket capacity and dump clearance drive the choice. A track loader excavates better in soft ground; a wheel loader travels faster.
- Scraper: loads itself (or is push-loaded), hauls, and dumps in layers - a complete load-haul-spread cycle for medium hauls. Elevating scrapers self-load in friable material.
- Excavator: boom, stick, and bucket; digs below grade, loads trucks from above, trenches, and handles rock with a breaker.
- Backhoe (tractor-loader-backhoe): a loader bucket on one end and a hoe on the other; a utility machine for small digs, utility work, and loading.
- Motor grader: long wheelbase, adjustable moldboard on a circle; shapes, crowns, ditches, and fine-grades.
Supporting and specialty machines
Compaction equipment (smooth drum roller, padfoot/sheepsfoot, plate and rammer), haul units (rigid and articulated dump trucks, articulated haulers for soft or steep ground), water trucks, and telehandlers/cranes for lifting. Note frame type (rigid vs articulated) and undercarriage (track vs rubber tire) because they set the machine's traction, speed, and turning behavior.
Traps in questions
Expect swapped roles: a grader described as a compactor, a loader described as a trenching machine, or a scraper described as a fine grader. Another trap is confusing a backhoe with an excavator, or a track loader with a dozer. Read the described task, not the machine name.
Rule of thumb
Match the machine to haul distance: loaders for very short cycles, scrapers for medium hauls, and trucks for long hauls.
Pre-Use Inspection and Preventive Maintenance
The walk-around sets the tone for the shift
A pre-use inspection is a documented, systematic walk around the machine before it moves. Work from a checklist and from one side of the machine to the other so nothing is skipped. Typical items: fluid levels and condition (engine oil, coolant, hydraulic oil, fuel), leaks and weeping hoses, belts, battery and connections, air cleaner, tire condition and pressure or track tension and undercarriage wear, cutting edges and teeth, pins and bushings, safety decals, fire extinguisher, and the structural condition of the ROPS/FOPS.
Then check the operator station and the functions: seat and seat belt, horn, backup alarm, lights, wipers, mirrors and cameras, gauges and warning indicators, service and parking brakes, steering, and the lockouts. Operate the attachment through its full range in a clear area and watch for drift, unusual noise, or sluggish response.
Preventive maintenance
The core idea is interval-based care: grease fittings, filter changes, oil sampling, coolant condition, and correcting small leaks before they become failures. Clean machines run cooler and let you spot leaks. Record everything; defects are written up and the machine is tagged out if unsafe.
Traps in questions
Three classic wrong answers: checking for hydraulic leaks with a bare hand (use a piece of cardboard or wood - pinhole injection injuries are severe), opening a hot radiator cap, and crawling under a raised blade, bucket, or machine supported only by hydraulics. Another trap is the operator who skips the walk-around because the machine was run the day before, or who repairs a defect and never records it.
Rule of thumb
Budget roughly 10–15 minutes for a full walk-around, and remember the rule: if you would not sign your name to the machine's condition, it does not go to work.