Randy, IMO hp of an engine is not as important as having a pump that has the proper gpm as you mentioned. Are you thinking if having a pony engine with a pump just for the tiller. More info needed and maybe a pic. ✌ Harry
My thoughts are to pick up a used 444 or 446 and use the tiller on the equipment it was made for. I’m sure you’ll be so happy with a Case GT. ✌HarryWell my 2072 has a rear pto straight from the transmission, but not sure if that approach is feasible right now. I know this case tillers use "engine oil" not hydraulic oil. So my thought was to mount an hydraulic pump and gas engine coupled together with "spider" coupler, have a small resevoir, and a bypass valve to engage and disengage tiller as needed, all mounted (not sure yet). Just not sure if i can get by with a smaller HP engine like 3-5 Hp?
I know cubcadet has tillers, but this Case tiller is in really good shape, and i thought if i could make this work, since i already have it.
This is actually a pretty straightforward problem, although it requires referencing a few tables/documents. You can calculate the horsepower needed for hydraulic work using the following formula:My research has told me i need a 8.5 to 9.5 gpm hydraulic pump to run tiller, (correct me if I'm incorrect), just not sure what HP engine is needed to run pump for tiller along with oil resevoir.
Look for the hydraulic manuals, there are drawings that show the oil flow for various configurations of Case GT's. A rear PTO valve was optional equipment. The standard tractor the oil went from the pump to the TCV then to the drive motor then to the cooler and back to the tank. Adding the PTO valve changed the plumbing, by going from the pump to the PTO valve then to the TCV. So no the flow is NOT split between the wheels and tiller.You shouldn't need ALL 8.5 GPM since the 400 series tractor the tiller was designed for has a pump that's 8.5gpm total split between driving the wheels and the tiller. Just make sure the pressure is right for the tiller motor, not sure what pressure they run at stock.
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So how does that work then? If it isn't split between the tiller and the wheels then when running the tiller the wheels shouldn't move right? The wheels have to take some sort of flow away from the tiller sort of like running a pair of light bulbs in series, the first one will get dimmer if the voltage is constant. In my mind you can equate hydraulic flow like water flow through a system and that typically follows pretty closely to the same principles as electricity. At least that's what I was told when I took my fluids class and fluids lab, high pressure systems like a hydraulic system may behave a little different than what I'm thinking.Look for the hydraulic manuals, there are drawings that show the oil flow for various configurations of Case GT's. A rear PTO valve was optional equipment. The standard tractor the oil went from the pump to the TCV then to the drive motor then to the cooler and back to the tank. Adding the PTO valve changed the plumbing, by going from the pump to the PTO valve then to the TCV. So no the flow is NOT split between the wheels and tiller.
So no the flow is NOT split between the wheels and tiller.
That's a great point @Gordy ! I think it's a common misconception just because mentally it's easy to think of the flow being split between the two hydraulic motors. In actuality, it's the pressure that gets split between the two motors.So how does that work then?.
This is the approach some Cub Cadets uses to run tiller(3206 model for example) I believe the Case tractors have a relief valve set at 2100 psi which is fairly low as hydraulics go. As another person correctly responded it's the flow you need.Get a PTO driven pump. Install a lube reservoir and set it up as a stand alone unit. When you put it on your tractor the only time it runs is when you engage the PTO. No need for a flow valve or pony motor. Keep it nice and simple.