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01-13-2009, 10:34

Post: 159388

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Kubota RTV 900 with Curtis Cab

I had an RTV a while back. Near as I can figure it burned about 3/4 of gallon of fuel an hour.

That's great economy but the down side is that is not a whole lot of BTU's spread out over time. Not much left over for the cab heater.

It is not a new problem. The original VW's ran fine in California but they had to add a supplemental gas fired heater for colder climates.

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01-16-2009, 10:33

Post: 159515

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Kubota RTV 900 with Curtis Cab

It would not surprise me one bit to find out that the surface area of the block and head is enough to cool the engine if the weather is cold enough.

I have been to Fairbanks in the winter and seen it so cold that the biggest gas hog V-8 barely cracked the thermostat.

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01-16-2009, 12:56

Post: 159529

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Kubota RTV 900 with Curtis Cab

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Originally Posted by 1mountainman | view 159517

The RTV struggles to get up my steep driveway, it's got to be in the hydraulic's.

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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01-16-2009, 13:55

Post: 159532

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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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It would not surprise me one bit to find out that the surface area of the block and head is enough to cool the engine if the weather is cold enough. I have been to Fairbanks in the winter and seen it so cold that the biggest gas hog V-8 barely cracked the thermostat.

It would not surprise me one bit to find out that the surface area of the block and head is enough to cool the engine if the weather is cold enough.

I have been to Fairbanks in the winter and seen it so cold that the biggest gas hog V-8 barely cracked the thermostat.