We pushed our heavy duty pallet jacks to the limit—1,000+ hours in an extreme cold storage application test, emptying 1,300 trailers, moving 50,000 pallets and transporting 105,000,000 lbs. of freight—without lubrication or service. Just the dependability that you’d expect from a world-class manufacturer like Yale. Of course, we don’t recommend you treat your trucks this way. Always follow recommended maintenance intervals.