The 621F wheel loader from Case Construction Equipment provides up to a 10% increase in fuel economy while delivering faster acceleration, quicker cycle times, and higher travel speeds. The loader evolved from the company’s E-Series machines, but to meet Tier 4 Interim emissions standards, the F-series uses selective catalytic reduction (SCR) technology, which results in lower temperatures in the exhaust system while optimizing combustion. Case Construction Equipment. 866-542-2736.