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Emission Evolutions

Emission Evolution for Off-Road Equipment

What did Bobcat do from Stage I to Stage IV?


Stage I: we reduced Nitrogen Oxide (NOx) emissions from diesel machines
Stage II: we focused on reducing NOx, Hydrocarbons (HC) and Particulate Matter (PM)
Stage III: we achieved a major reduction of PM and a further reduction of NOx
Stage IV: we have reduced NOx levels dramatically and have further reduced PM again.



The following table shows the magnitude of the reduction of emission levels from Stage I to the current Stage IV:

Engine output P CO HC NOx PM
56 ≤ P ≤ 130 kW   in g/kWh 
Stage I (1999) 5.0 1.3 9.2 0.70
Stage IV (2004) 5.0 0.19 0.4 0.025
Emission reduction (in %)
from Stage I to Stage IV
0% -58% -96% -96%

As the emission values and the demands for compliance vary according to engine horsepower, the extent and type of change to our machines have varied considerably.

However, a number of core improvements have been applied to all our equipment, including: turbo-charging, optimisation of the engine combustion system, and use of High Pressure Common Rail (HPCR) fuel injection systems.