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Kubota RTV 900 with Curtis Cab
Murf,
As they say, "There's more than one way to skin a cat". I've personally never tried it, but that's what they say.
A diverter valve, like the one I posted earlier, can be used in many different configurations. It can close off the flow of coolant to the heater core, or to the engine...depending upon how it's plumbed in.
I looked at the one I posted a link to, and it appears that the hose fittings would be too small to connect to the radiator hoses.....so you're right.....that one probably wouldn't work the way I had intended it to.
What I was trying to accomplish, was to divert all or most of the water in the radiator circuit, through the cab heater core instead........in essence converting the cab heater core to a small radiator....bypassing the main radiator altogether.
1mountainman,
I find it hard to believe that the thermostat isn't opening at all. My little 21hp Kubota engine will overheat if I'm not careful, even at temps well below zero. I have to carefully monitor the engine temp when I block off all of the air passing through the radiator.
I'll stop back after I get the driveway cleaned out.
Joel
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Kubota RTV 900 with Curtis Cab
I like your thinking. Now that you put it that way I understand what you meant. I even thought about "disconecting" the radiator and using the heater core as the radiator, your idea would be better to accomplish same as it would be no-mess just flip a lever. Lots of different good ideas to ponder. And you are probably right the thermostat is openning , but ever so slight.
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Kubota RTV 900 with Curtis Cab
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The RTV struggles to get up my steep driveway, it's got to be in the hydraulic's.
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The problem referred to in the above quote is not about engine temp, it's about power.
Basically the RTV is puny. It is rated at about 22 HP but it is hooked to a power hogging transmission. Up at my altitude it only makes about 16 HP on a hot day and I figured it takes about half that HP to just run that very complex HST.
I would bet money that if someone put an RTV on the dyno it would get 10 HP or less at the wheels.
BTW, make sure you have Super UDT in your machine. In my experience regular hydraulic fluids will rob even more power from the RTV.
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Kubota RTV 900 with Curtis Cab
Rankin, what is your opinion on why the hydro sucks up power? My experience has been very positive with hydros. In fact, as was discussed a few years ago, hydros were working their way into the over-the-road semi truck market replacing the entire gear transmissions. They found great gains in fuel economy.
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Kubota RTV 900 with Curtis Cab
The RTV does not have a standard tractor HST.
Unlike a tractor HST, it has to shift itself through the speed ranges so it has more bypass valving and circuitry and is very heavy.
The RTV weighs 2000 pounds. That's 400 pounds heavier than the Kawasaki diesel mule and 600 pounds heavier than the much larger Honda MUV. I'm thinking all that extra weight is in that huge transaxle.
Kubota sez the RTV transaxle is a modified version taken from the B7800, but the RTV is 250 pounds heavier than a base 7800.
The Kubota mechanics who tried to get more power out of my RTV said it has a lot more widgets and gizmo's (tech talk) inside the HST. My RTV would stall the HST if I chained it up in snow.
Actually it would be a fine set-up if it was hooked to a 40 horse power plant.
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Kubota RTV 900 with Curtis Cab
1mountainman, just wondering and it always address sorry; how long are you driving at the time?
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My experience has been very positive with hydros.
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Jeff, the proof is in the 'putting'. The 'putting' of the right foot down on the accelerator that is!
As an example, my Kubota (at home) has a ~40hp engine. I also have a turbo diesel SmartCar that makes ~40hp.
The tractor will run at about 25 mph on flat land. There is a short but rather steep hill between me and my airport, it slows to ~15mph going over that hill.
The SmartCar will easily run to 85mph (where it hits the speed limiter) and will go over that same hill without downshifting and will easily clear it at any speed I like without losing any speed.
The tractor has MUCH deeper (overall) gearing, and has gobs more torque. It is also a HST drive.
The SmartCar is an automtic transaxle.
BTW, my previous 'personal tractor' was only a 35hp model, and climber that same hill FAR better. It was a gear (GST) drive.
From what I've read the OTR trucks use a hybrid drive. It uses a CVT to get to speed then locks it as a solid gear drive. The economy comes from eliminating bad drivers, not the mechanics of it.
Best of luck.
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Kubota RTV 900 with Curtis Cab
Murph, what your thinking on why the coolant flows through the HST? to help warm it in the winter or cool it in the summer? Mostlikely the answer is both
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Kubota RTV 900 with Curtis Cab
Murf the one I saw was in a heavy equipment mag. It looked like a big pump hooked to a big hyd. motor. Don't recall anything about locking up or a CVT.
Kenny: "just wondering and it always address sorry"
What the heck are you on, man? Is it something in the water down there or lack of? (It IS a lack of SOMETHING!)
And don't Murf-it and blame your spellchecker 'cause you are waaaaaaay beyond needing a spellchecker!
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Murph, what your thinking on why the coolant flows through the HST?
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I'd be surprised if it was for heating, a typical HST makes more than enough heat of it's own, and usually warms faster than the engine does. The friction and load makes them start to heat up the minute it begins rolling.
They probably thought it was easier to use it as a cooler than trying to add a second seperate circuit and cooler to it.
Jeff, the only two I've seen were a CVT (by Volvo if memory serves) and a semi-auto that was computer controlled, much like a bigger version of the 'bota GST system, an automated hydraulically operated clutch and gear shifter all in one.
Maybe Kenny is fine, maybe you need a 'redneck-checker', whad'dya think huh? 
Best of luck.
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