PSI Engine

Take control of fuel usage and lift truck performance with the PSI engine.

Engines with Yale® Flex Performance Technology™ feature adjustable performance modes that allow you to maximize performance or fuel economy to fit your specific application requirements

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Adjustable Performance Modes

  • Custom-designed for Yale by Power Solutions International
  • Extended service intervals
  • Reduced periodic maintenance requirements
  • Improved operator ergonomics


  • 30,000 hours of testing
  • 17,000 hours of driving
  • 300 hours of multi-axis stimulation testing
  • 14,500 hours of engine dyno testing



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