Tractor & Machinery Operator Test flashcards
Tractor & Machinery Operator Test · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Differential lock purpose
- It locks the two rear wheels to turn at the same speed, restoring traction when one wheel slips. Engage at low speed on straight ground and disengage before turning to avoid driveline windup.
- Draft control versus position control
- Draft control senses implement pull and raises or lowers the hitch to hold a set load, useful for plows. Position control holds a fixed working height, used for mowers and transport.
- Independent PTO
- A PTO that can be engaged and disengaged separately from the transmission and remains driven when the clutch pedal is pressed. It keeps turning after the tractor stops, so shut it off before dismounting.
- Lugging the engine
- Running the engine below its torque peak under heavy load, causing high exhaust temperature, poor combustion, and possible stall. Select a lower gear so the engine stays near rated speed.
- Hand throttle use
- A lever that sets a constant engine speed independent of the foot pedal, used for PTO-driven implements. It must be returned to idle before dismounting to prevent unintended movement.
- Rear overturn cause
- Pulling a load from a hitch point above the drawbar axis converts forward pull into a rearward tipping moment. Always pull from the drawbar at or below the specified height.
- Daily walk-around inspection
- A pre-start check of fluids, tire condition and pressure, wheel nuts, guards, lights, SMV emblem, brakes, and steering. It is performed before every work shift, not weekly.
- Hot radiator cap hazard
- Opening a pressurized cap on a hot engine releases steam and boiling coolant that can cause severe scalding. Check coolant only when the engine is cold and the system is depressurized.
- Tire inflation by load
- Tire pressure must match the actual axle load from the manufacturer's load and inflation table. Unequal rear pressures cause uneven traction and pulling to one side under braking.
- Air filter restriction indicator
- A gauge that shows when the engine air filter is clogged. Service at the indicated restriction; a damaged element lets dust into the cylinders and causes rapid wear.
- Battery connection order
- When servicing a battery, disconnect the negative terminal first and connect it last to avoid sparks near hydrogen gas. Charging batteries produce explosive hydrogen.
- Tire rim explosion hazard
- Welding, heating, or striking a rim with a tire mounted can ignite trapped air or ignite the tire, causing an explosion. Deflate fully before demounting a multi-piece rim.
- ROPS and seat belt
- A rollover protective structure plus a fastened seat belt keeps the operator inside the protected zone during an overturn. A ROPS without a belt can eject or trap the operator.
- No-rider rule
- A tractor has one operator seat, so carrying passengers on the fender, hitch, or loader bucket is prohibited. Riders are a leading cause of run-over and fall fatalities.
- Safe starting sequence
- Start from the operator seat with the transmission in neutral or park, PTO disengaged, and clutch depressed on interlock models. This prevents lurching when the engine catches.
- Slow-moving vehicle emblem
- A reflective orange triangle mounted at the rear that warns drivers of a vehicle traveling below normal road speed. It is required on public roads in most jurisdictions.
- Three-point hitch categories
- Categories 0 through 3 are defined by pin diameter and lower-link spacing. A mismatched category causes link wear or a loose connection, so match the implement to the tractor.
- Drawbar pull point
- The drawbar is the only approved point for pulling heavy loads, at or below the manufacturer's specified height. Hitching higher increases the risk of a rear overturn.
- Check chains and stabilizers
- They limit side sway of the lower links so the implement cannot swing into the tires. Set them with enough slack to allow normal lift but without excessive lateral movement.
- Loader rated capacity
- The maximum load stated at a specified distance from the pin. Capacity decreases as the load center moves forward, so a bale spike may be rated lower than the bucket.
- Ballasting for loader work
- Rear ballast keeps the rear axle loaded and the steering effective when lifting with a front loader. Front weights are added when a heavy rear implement unloads the front axle.
- PTO speed ratings
- Standard PTO speeds are 540 rpm and 1000 rpm, reached at specific engine speeds. Exceeding the implement's rated speed can burst rotating components and cause fatal injury.
- PTO driveline overlap
- The telescoping shaft must keep at least one-third of its length overlapping and the angle under about 15 degrees. Too short a shaft can separate under lift and swing free.
- PTO entanglement response
- Stop the engine and disengage the PTO before helping an entangled person, then call emergency services. Never reverse the shaft; control bleeding with direct pressure while waiting.
- Hydraulic quick coupler seating
- Couplers must be clean and fully seated before pressure is applied. A partially connected coupler can blow off and inject fluid through the skin, which is a surgical emergency.
- Relieving hydraulic pressure
- Lower the implement, shut off the engine, and move the control levers through their range to bleed residual pressure before connecting or disconnecting lines.
- Slope travel rule
- Travel straight up and down slopes rather than across them. Turning on a slope or carrying a raised loader increases lateral overturn risk by shifting the center of gravity.
- Loader travel height
- Keep the bucket about 20 to 30 centimeters above the ground while moving. A raised load raises the center of gravity and blocks the operator's view.
- Tractor tire speed rating
- Tractor tires are often rated well below highway speeds, and sustained high speed causes heat buildup and failure. Observe the posted limit and the tire's rating.
- Runaway diesel shutdown
- Uncontrolled overspeed from ingested oil or fuel is stopped by cutting the air supply with an intake shutoff or CO2 into the intake. Do not stand in line with the exhaust.
- Rollover response
- If the machine tips, stay in the seat with the belt fastened and brace. Do not jump, because most fatalities occur when the operator is crushed outside the protective zone.
- DPF regeneration safety
- Active regeneration raises exhaust temperature, so perform it away from dry crop residue. Never park over straw or chaff during regeneration, since the heat can start a fire.