Abstract: A fluid actuator where an outside cylinder envelopes an inside cylinder producing four chambers, two for the power stroke and two for synchronization, for application where two or more cylinders are to drive a single load such that all cylinders advance at the same rate by cross plumbing synchronizing chambers. The combination is provided with valve means which opens at the end of each stroke to realign the actuators.

Abstract: Apparatus for harvesting, delimbing and cutting trees into sections is disclosed herein. The harvesting apparatus includes grapple means and cutter means on a mast which is supported on a boom of a vehicle. The delimbing and cutting into sections is accomplished with a separate frame that may be in the form of a trailer processor attached to the vehicle and positioned so that the mast and boom may be utilized for forcing the tree into engagement with a tree advancing mechanism on the trailer and the cutter means on the mast may be utilized to cut the delimbed tree into sections. The system is also designed so that the hydraulic circuitry for driving the vehicle may be used as the power source for the processor.