2002sliverado
Member
I have a 1979 4640 that I use for various tasks which includes planting. I have a 12 row model 3200 Kinze planter equipped with an orbit motor driven centrifugal pump for liquid starter fertilizer and I have the choice of either using a hydraulic variable rate population drive or the factory ground driven chain drive, which is what I have been using simply because the hydraulic output on the 4640, I feel, has never been all that great. It raises and lowers the planter and hydraulic markers slower than what I would expect it to do, even when I am not using the liquid starter when planting soybeans. That pump does not seem to take a lot of hydraulic oil flow to operate it. Here are the figures when the hydraulic system was last checked when the tractor was in for some major repair work 3 years ago. 18 gpm at 1000 psi and 12 gpm at 2000 psi. Standby pressure was at 2000 psi and was turned up to 2300 psi.
My question has 2 parts. Aren't these volumes cited too low? I seem to recall seeing something about rated hydraulic flow on a 4640 being around 20 gpm, but I do not recall any more information on that. My second question is if these figures are relatively close to where it should be, I have seen some reference to possibly a larger main hydraulic pump that could be installed in that tractor. Is that something that could be done? Pros and cons to this?
In a closing thought. The figures I have seen on the hydraulic flow demands for the centrifugal pump to be around 2 or 3 gpm, and each of the two variable rate hydraulic drive motors being 2 to 5 gpm. If I want to use the full hydraulic capabilities of this planter, would I simply be best off purchasing a pto driven hydraulic power unit to operate these devices and leave the rest of them on the tractor's hydraulic system?
I am struggling with this issue because I tend to believe the main hydraulic pump is not putting out what it should.
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My question has 2 parts. Aren't these volumes cited too low? I seem to recall seeing something about rated hydraulic flow on a 4640 being around 20 gpm, but I do not recall any more information on that. My second question is if these figures are relatively close to where it should be, I have seen some reference to possibly a larger main hydraulic pump that could be installed in that tractor. Is that something that could be done? Pros and cons to this?
In a closing thought. The figures I have seen on the hydraulic flow demands for the centrifugal pump to be around 2 or 3 gpm, and each of the two variable rate hydraulic drive motors being 2 to 5 gpm. If I want to use the full hydraulic capabilities of this planter, would I simply be best off purchasing a pto driven hydraulic power unit to operate these devices and leave the rest of them on the tractor's hydraulic system?
I am struggling with this issue because I tend to believe the main hydraulic pump is not putting out what it should.
Untitled URL Link