John Deere has upgraded its skidder product line with a new lock-up torque converter option for the 640H and 648H Skidders and a standard brake declutch on all direct drive skidders. "With the lock-up torque converter, skidder operators will get a significant increase in productivity in the woods vs. a standard torque converter," said Elizabeth Quinn, skidder product marketing manager at John Deere. "The more a skidder operates in lock-up mode, the more work it will get done – the lock-up torque converter increases the power that reaches the ground."

Deere's lock-up torque converter stays locked during shifting and through a wider range of ground speeds than competitor units. This keeps machine momentum through shifts and helps ensure a smoother ride. In a productivity comparison, a 648H Skidder with the lock-up option moved 24.4 percent more tons/hr under maximum load than a unit equipped with a standard torque converter.

"That's an additional three truckloads of logs going to the landing each day, assuming a usual 14 truckloads per day," Quinn said. The 648H with lock-up torque converter achieves its productivity boost without an increase in horsepower. It continues to be rated at 184 hp with six forward and three reverse gears, but more available power is now delivered to the ground, particularly in lower gears.



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