A turf aerator is provided with three aligned aerator shafts having aerator devices mounted thereon. The innermost shaft is mounted in a frame for free-willing operation and the two outer shafts are each connected to a motor through selectively controlled hydraulic pumps which in turn are connected to hydraulic motors for driving the outermost shafts selectively or simultaneously with the innermost shaft being mounted for free-willing operation.
1. A turf aerator comprising a frame, motor means for driving the aerator, first, second and third aerator shafts rotatively mounted in said frame in axial alignment with each other, each having a plurality of tines mounted thereon for aerating the turf, said second aerator shaft being disposed intermediate said first and third aerator shafts and mounted in said frame for free-willing operation, said second aerator shaft including at least a first tine assembly and a second tine assembly independently, rotatably mounted thereon and drive means operatively connected between said motor means and said first and third aerator shaft for selectively driving either the first aerator shaft or the third aerator shaft or both the first and third aerator shafts simultaneously, the first and third aerator shafts drivable at different speeds by the drive means to assist in turning the turf aerator or traversing a slope.
2. A turf aerator as set forth in claim 1 , wherein said motor means has an output shaft, first and second hydraulic pump means operatively connected to said output shaft, first and second hydraulic motors operatively connected to said first and second hydraulic pumps and drive means operatively connecting first and second hydraulic motors to said first and third aerator shafts, respectively.
3. A turf aerator as set forth in claim 2 , further comprising first and second control levers mounted on said frame and operatively connected to said first and second hydraulic pumps respectively for controlling the operation of the pumps which in turn controls the operation of the motors which in turn control the rotation of the first and third aerator shafts.