Buying a Tractor with a Tier 4 Engine: 5 Questions to Ask

Farm Industry News
Jodie Wehrspann

The Nebraska Tractor Test Lab’s Roger Hoy offers this list of questions to consider when buying your next 174-plus-hp tractor:

Selective Catalytic Reduction (SCR) systems 

  1. How much diesel exhaust fluid (DEF) is required?
  2. What is the cost of DEF?  (This number varies significantly when you compare buying the jugs that contain several gallons with buying in bulk.)
  3. Will I need an additional pump and tank to store DEF and possibly an additional supplier?
  4. Because DEF is a consumable fluid, how can I compare the total consumable fluid cost of a SCR system to both a Tier 3 system and a diesel particulate filter (DPF) system for various farming operations?
  5. If I choose an EGR/DPF system now, will I have to deal with DEF anyway when final Tier 4 is introduced in 2014?

Exhaust Gas Recirculation (EGR) systems 

  1. How often will active regeneration occur in various farming operations?
  2. How much incremental diesel fuel will be expended in active regeneration?
  3. Can I continue using the tractor as I like during an active regeneration or will productive farming operations be affected during regenerations?
  4. How can I compare diesel fuel costs to traditional Tier 3 systems and the SCR systems that use both diesel and DEF?
  5. If I choose a DEF system now, will I have to deal with a DPF system anyway when Final Tier 4 is introduced?