jeff9366
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- Joined
- Jan 14, 2011
- Messages
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- Tractor
- Kubota Tractor Loader L3560 HST+ ~~~~~~~~~~~~~ 3,700 pounds bare tractor, 5,400 pounds operating weight, 37 horsepower
YOOPER DAVE
Tier IV Emissions Confusion
Are new tractors with <25hp Tier IV emission exempt ?Tier IV Emissions Confusion
The demarcation is 19 kW engine power output = 25.4794 horsepower.
While Tier IV exempt, tractors with <25.4794 horsepower comply with relatively loose Tier II emission requirements.
Some mfrs note no pollution filter is needed, but tier 4 compliant.
Most manufactures can meet Tier IV requirements without a Diesel Particulate Fillter up to about 27 horsepower via engine design and injection timing.
(Diesel Off-road emission standards are uniform in developed world.)
Then there is a horsepower gap.
Beginning about thirty-three horsepower most tractors have Diesel Particulate Filters.
If there is no DPF there is an alternative incendiary technology to burn off very fine particulates (soot). Sometimes exhaust heat is elevated all the time, sometimes periodically.
Diesel particulates must be burned. THERE IS NO FREE LUNCH.
Tire wear and tire replacement will cause as many headaches and more expense than DPF for most long term compact tractor owners who comprehend their tractor's Operator's Manual and follow DPF procedures.
Many small property users regenerate only once per year. This creates regeneration procedure uncertainty in itself. (Regeneraton occurs every ~~60 engine hours. Non-commercial users average 80 engine hours of tractor use per year.)
Last edited: Jun 29, 2019
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