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RTV Problems and Solutions
There are actually two intractable problems: Horsepower and Reverse gearing. First the gearing:
The listed top speeds in the forward ranges are: Low-10 mph, Medium-18 mph and High-25 mph. Now look at the speed range for Reverse.......15 mph. Who on earth needs to go that fast in reverse?
And why make reverse the same range and pulling power as the middle forward gear? What is wrong with going 10 mph max in reverse? Or even 5 mph? Why gear it so much higher than Low?
I did a lot of testing and spent too much money and time try to get around this engineering shortfall.
Bottom line is with this tall gearing and the power loss I experience a mile above sea level(it really needs a 30 horse engine), the RTV gets stuck too often. When I get into soft sand with standard size tires and the wheels sink ONLY 3 INCHES below the surface, the Reverse gears REFUSE to turn the tires.
Low/forward will dig them in deeper any time you want, but once you sink past the 3 inch mark in sand (OR SNOW!) reverse is gone. The wheels will not turn in any mode, 2wd... diff lock or 4wd.
I have gotten stuck going UPHILL in three inches of sand and it refused to back itself out going down hill.
I found a fix though..... smaller wheels. The factory turfs are only 21 inches tall and they reduce the overall gearing in Reverse just enough to make the wheels spin in almost any circumstance.
BUT.... there is no free lunch here. The turfs are virtually useless in snow and the top speed is reduced to about 21 mph. The ground clearance is so low that you can't run over a softball size rock without bouncing it off the skid plates so it is almost useless off road or even on bad roads.
Other tests: on a concrete slab, jam a 4x4 piece of lumber under the rears and that darn thing will smoke the tires in 2wd trying to climb it in reverse. Put it in Reverse 4wd and it will claw its way over the obstruction in 2 seconds. Take it 50 feet away and let it sink three inches into the sand and the tires will not turn.
The dealer has checked every function and pressure path in the transmission and found it is up to specs. Kubota told my dealer that they purposely limited the amount of wheel spin in reverse and I believe that is true.
If you really jam the wheels in any other gear it will kill the engine. In reverse the engine will run about 2500 RPM with the wheels locked up but it won't kill the engine. I think there is some sort of high pressure bypass built into the system that allows this to happen.
Anyway, it is all cleaned up and back at the dealer on consignment.
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RTV Problems and Solutions
Monkeyman... your machine was broken. Kubota did the right thing with you. Mine isn't broke, it just does not have the off road performance I need.
It will do just about anything I want on hard surfaces, it just gets into trouble in mud, sand and snow. Someone with a lot of flat acreage or a golf course will love it.
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RTV Problems and Solutions
I am sure my RTV would have pulled a hay wagon.... on a hard surfaced road, closer to sea level. I never had a problem with the low/forward range, unless I got in real deep sand and really buried it.
It is going away because it cannot handle its own weight in reverse.
I wish I could get it to the other coast too, between Art and Murf we could probably come up with something, at least on the transmission. The only thing that will cure the altitude problem is a bigger engine.
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