Umweltschutz und Kraftstoffeffizienz - Environment and Fuel Efficiency
This domain asks a practical question: can you run a tractor economically and with the least possible impact on soil, air and neighbours? Marks are lost by candidates who treat fuel saving as a matter of driving slowly.
Exhaust after-treatment
Modern tractors use an SCR system with AdBlue (urea) to cut nitrogen oxides, plus a diesel particulate filter. Both need care:
- Use only the specified AdBlue quality (DIN 70070 / ISO 22241) and never top it up from a dirty can; contamination destroys the catalyst.
- Short trips, low load and long idling keep the filter cool, so regeneration is interrupted and the warning lamp appears. A loaded run at working temperature completes regeneration.
- Never ignore an emissions warning: a derated engine in the middle of harvest is worse than an early workshop visit.
Fuel-efficient operation
- Engine speed, not road speed, burns fuel. Where the implement allows it, use the economy PTO (540E instead of 540, or 1000 instead of 1000E) and reduce engine rpm while keeping the required PTO speed.
- Ballasting and tyre pressure decide how much power reaches the ground. Too much ballast wastes fuel moving weight; too little causes wheel slip that destroys the tyre and the fuel bill.
- Gear and throttle: work in the highest gear that holds the load without labouring; avoid full throttle at low load.
- Idling: switch off for waits longer than a few minutes, except where the handbook requires a cooling-down period (turbo).
- Planning: combine trips, avoid unnecessary transport runs, maintain filters and injectors.
Soil, water, noise
- Avoid working wet soil that will compact; compaction costs yield for years.
- Refuel with a drip tray away from watercourses; keep absorbent material on the machine; report spills.
- Hydraulic oil leaking from a quick coupler contaminates soil - fix leaks immediately and use biodegradable oil where specified.
- Keep the exhaust and engine covers clean and avoid unnecessary revving near houses; noise limits and quiet hours apply.
Worked example
A farmer spreads slurry at 540 PTO rpm with the engine at about 2100 rpm. The same pump gives full output at 540E with about 1500 rpm. Choosing 540E keeps the work rate yet cuts fuel use noticeably over a long day. Reasoning: PTO output depends on PTO shaft speed, not engine speed, so the extra engine revolutions only produce noise, heat and consumption.
Traps that cost marks
- Believing idling saves fuel on a cold morning; it only adds wear and emissions.