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Kubota RTV 900 with Curtis Cab
I don't know jack about an RTV other than seeing them on the lot, is there a way to capture some of the heat off the HST cooling system / radiator and duct it to the inside of the cabin?
We did that with a full sized farm tractor and it made the cab so hot we had to run it with the windows open!.
Best of luck.
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Kubota RTV 900 with Curtis Cab
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I think a lot of people responding aren't graping what I am bringing across, the engine doesn't even get hot enough to make the temp guage move, yes it works as well.
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I suspect if you got a remote temp. probe on a multi-meter you'd find the problem is not that the engine and HST isn't getting hot.
The gauges are notoriously finicky. They only read in a VERY narrow range. The needle doesn't even move for the first couple hundred degrees (i.e. -20° and 150° are the same place) then the gauge rises rapidly above ~160° to the maximum of ~220°.
In other words the gauge only reads a narrow, probably 60° range of temperatures.
Put an aftermarket unit on and I'll bet you see there's a difference.
Best of luck.
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Kubota RTV 900 with Curtis Cab
Joel, forgive me, I don't think I've had enough coffee yet this morning. 
How exactly would stopping all flow to the heater help him with his problem of not enough heat in the cabin?
All Asian made diesels seem to have very efficient cooling systems.
Our Kubota's take a good amount of work to warm them up too, even a prolonged fast idle won't do it, you must WORK them for 10 minutes or more. In our case roading to the work area is more than enough. Even with grill covers in place they almost never run as warm as they do in warmer weather. Despite that though, they do in fact warm up.
I suspect in this case though it's just too much cooling and not enough work.
Best of luck.
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Kubota RTV 900 with Curtis Cab
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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
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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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