Smaller displacement Tier 4 engine matches Tier 3 power in heavy duty lift trucks

Sources: Hyster Co., Greenville, N.C.; CP staff

Hyster engineers’ disassembly and in-depth examination of a Tier 4 Cummins QSL9 engine—powering one of the manufacturer’s Big Trucks series forklifts for nearly 10,000 hours—revealed major components, fuel system, turbocharger and block to be in near-perfect condition after three years in a heavy duty application. The results suggest a Cummins Inc. Tier 4 package could complete 20,000 hours of operation before an engine overhaul may be needed, which is equal to the life-to-rebuild of the larger 11-liter QSM11 Tier 3 engine in a similar duty cycle.

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