April 15, 2016

Mythbusters

You may have some concerns about Final Tier 4 (FT4) emissions. Our Mythbusters put common misconceptions about our FT4 engines to rest.

Myth: Newer John Deere engines sacrifice performance and durability to meet emission regulations.

Fact: Engine performance for EPA FT4/EU Stage IV meets or exceeds that of previous John Deere engines. At Deere, we've always used a building-block approach to emission compliance, systematically adopting new technologies and integrating them with our field-proven platforms. To meet stringent FT4 standards, we're building on our EPA Interim Tier 4 (IT4)/EU Stage IIIB solution with exhaust filters and selective catalytic reduction (SCR) to deliver the best combination of performance, efficiency, and reliability.

Myth: FT4 engines require more frequent oil-change intervals.

Fact: Oil-change intervals for John Deere PowerTech™ engines can be extended to 500 hours when using:

  • Diesel fuel with sulfur content less than 15 ppm (ultra-low sulfur diesel [ULSD] fuel mandated by the EPA);
  • John Deere Plus-50™ II or other oils that meet American Petroleum Institute (API) CJ4, ACEA E9, and ACEA E6 standards
  • John Deere engine oil filter

The initial oil-change interval with John Deere Break-In™ Plus oil also can be extended to 500 hours. Customers should use Break-In Plus for a minimum of 100 hours up to a maximum of 500 hours to properly break in the engine. The oil and oil filter should be changed at least once every 12 months, even if the hours of operation are fewer than the otherwise recommended service interval.

Myth: Engines with exhaust filters require a regular active regeneration during which fuel usage can increase.

Fact: A John Deere exhaust filter typically cleans itself through a process called passive filter cleaning. During normal operating conditions, the engine's natural heat breaks down trapped particulate matter (PM) and cleans the exhaust filter without impacting machine operation. If conditions (temperature, load, or speed) for passive regeneration cannot be achieved, then PM must be removed using active regeneration, also an automatic cleaning process. This requires injecting a small quantity of fuel into the exhaust stream for a short duration and elevating exhaust temperatures to clean the filter. Neither passive nor active filter cleaning impact machine operation under most conditions, and the amount of fuel used during an active filter cleaning is negligible.

Myth: Machine owners will have to frequently remove ash from their after-treatment systems.

Fact: In most cases, ash removal for John Deere DPFs is very infrequent. Ash service intervals for Deere DPFs are condition based, meaning the machine will notify the operator before service is required. After millions of hours of real-world use in machines powered by John Deere IT4 and FT4 engines at or above 175 hp, we've found that ash service is typically not necessary until the first engine overhaul. Machine application, regular maintenance practices, and type of lubricating oil impact ash service intervals.

Myth: John Deere FT4 engines have high internal combustion temperatures.

Fact: John Deere FT4 engines using cooled exhaust gas recirculation (EGR) and selective catalytic reduction (SCR) actually have cooler internal engine combustion temperatures than previous tiers. Cooled EGR engines do place more cooling requirements (higher heat rejection) on the cooling system. However, new cooling system designs and variable-speed fan drives meet these cooling needs as efficiently as possible. With the addition of SCR for FT4, optimized engine calibrations use lower cooled EGR flow rates than IT4, reducing the engine's heat rejection. This integrated system of cooled EGR, an exhaust filter, and SCR enables cooler engine combustion temperatures, higher power, higher peak torque, improved durability, lower diesel fuel consumption, and low DEF consumption.