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South Georgia | Okay, according to Phil Jensen's catalog (by the way, thanks, Phil), the 6500 model max rpm is 1200. Your motor probably idles that fast or faster, and probably wouldn't hold a real steady rpm at idle, anyway. So, that's out. The 4101 series is the highest max rpm rating, and it's only 2600, so still probably only about half throttle. I don't see which rotation they are, and I don't see an option for a reverse rotation in this catalog, either. Still, a XL model is about $270.
We used to use roller pumps to spray herbicides at plant. One year we started adding a dry flowable micronutrient, and started going through those stupid pumps faster than you could blink. I rebuilt several of them, and they still weren't worth anything. A 'rebuild' is just new rollers, but if the 'spider' or whatever you call the part that holds the rollers, is worn, too, so the spray apparently leaks back past it. Now, I'll admit, I was using the regular cast 'cheap' roller pump, but I was only running it at 540 rpm, and it still wouldn't last but a couple of days.
Next year I bought a turbine pump (sort of like a centrifugal, but it runs at only 1000 rpm), and have had no trouble since. Used it for over a year, then finally had to put bearings in it. Only real problem was, since it's not a positive-displacement pump, it wouldn't prime. After screwing the strainer off several times to get it to prime, I drilled and tapped a 1/8 pipe thread hole in the top of the pressure side of the pump, and ran a small line back to the top of the tank, so the air can vent out of the pump. Now the spray can flow into it, and it's 'primed' before I ever turn it on.
As for foaming/heating, no problem. My Deere 6700 has a centrifugal pump, and I always switch the agitation off when the tank gets down to 100 gallons or so. As long as you 'choke' it down on the pressure side of the pump, no problem. If your bypass currently goes into the top of the tank, you may want to put it back in the bottom, to cut down on foam.
Again, looking in Phil's catalog, the model 9203 centrifugal comes in either rotation, pedestal mount, and costs either $248 or $254, depending on which way you want it to turn. Not suggesting you buy it from him, as I haven't personally bought anything from him, but I just got a catalog from him last week, and it was close at hand for reference purposes.
The only thing we've got any more with those wretched roller pumps is a hooded sprayer, and that's only because it's got two separate wet systems on it. If I knew of an easy way to drive 2 of the turbine pumps off the PTO shaft, then those two would be gone, too. (Working on an idea, I just haven't gotten around to it yet.)
Adrian
P.S. I hate roller pumps.
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