Go BottomQuestion about Kubota HST operation
 | 8NFord
Join Date: Jul 2003 Posts: 29 Six Mile, SC 
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2003-07-10 59295
On the BX Series, does it hurt the tranny at all to ride around at less than full pedal on the transmission speed control. I mean is it like"slipping the clutch" when you are less than full pedal? This would not be good.
Thanks,
JD
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| DK35vince
Join Date: Feb 2002 Posts: 689 Western,Pa. 
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2003-07-10 59302
No,
Run the peddle where ever your power and speed are working best. ....
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 | Billy
Join Date: Oct 1999 Posts: 975 Southeast Oklahoma 
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2003-07-10 59303
wolbert is absolutely right. You can inch along if you want or go full peddle, it's up to you.
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 | jeff r
Join Date: Jul 2003 Posts: 428 burton. michigan
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2003-07-10 59305
Geee......isnt Hydro fun you gear guys??? ....
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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada 
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2003-07-10 59311
Well..... being a gear guy, with my BX I have a tendency to just push the pedal to the floor and adjust my ground speed with the hand throttle.
It's a little quieter that way. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2003-07-11 59320
Most HST's are variable displacement hydraulic pumps that drive hydraulic motors (there are variations on the idea). The range section of a HST is usually a conventional sliding gear design.
The speed pedal controls the volume of oil pumped. Less oil turns the motor slower, which means slower ground speeds. Slow pedal positions also are the equivalent of lower gears since the engine has to turn over more revs for the tractor to cover a given distance. When an engine lugs, the speed pedal may be reduced rather than increased like a gas engine accelerator, which is the equivalent of gearing it down.
There are no slipping or partially engaged parts to wear when operating low seed pedal and 'inching along' is what HST's are good at.
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2003-07-11 59325
Something that should be addressed is putting a high load on the the tractor at a low rpm. This is definitly a no-no! It wil cause damage to the hydro unit from oil starvation or cavatation depending on how you want to call it. This type action on a gear drive might also cause the engine to lug and an increase in the throttle and it goes away. ....
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| DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2003-07-11 59335
That is good info Art, thanks.
I usually run about 1/2 + throttle in low anyway. Hard to go much faster with rough ground and small wheels.
Kubota really needs to put a tach on this model. ....
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| jeff r
Join Date: Jul 2003 Posts: 428 burton. michigan
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2003-07-13 59448
For you guys that have a 3 range gear box on your HST it is possible to lug the engine by using low range #2 when your really need Low range #1. I know low range #1 is slower than slow , but it has the power you need when the going get tough and range 2 doesn't have the power to do the job. Going into a pile of dirt with the front loader IS NOT A JOB FOR RANGE #2!!! For some of you this won't make sense because you don't have a 3 range gear box, but for the guys that do it is REAL GOOD information. I hardly ever use Range 3 other than travel on the road at high speed on my B-2150. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2003-07-14 59452
Good points from Art and Jeff. Gear heads like myself can lug the engine and not do it any favours. People with HST can mess up both the engine and HST by lugging the engine. Well, I guess gear heads might not be doing clutches any favours using gears that are too high and rpm's that are too low.
I have four ranges and like Jeff I use 4th only when roading the tractor. Fourth range even in first gear at pro rpm is way too fast for any work I do other than getting down the highway. Gear do impose greater discipline than HST's because I can't infinitely vary ground speed in any range and I know better than to cut rpm in order to slow down. MY TX tes me I'm in the wrong gear before the engine lugs 'cause I'm going too fast.
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| Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2003-07-14 59454
Jeff if the soil is loose or if it's just a load of stone I do use medium range near full throttle. It gives outstanding feel of the the tractors traction and power. If it is tight then I use low range for the power. ....
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| jeff r
Join Date: Jul 2003 Posts: 428 burton. michigan
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2003-07-17 59657
I tried that Art many times in range 2....LOL.....it works but with me things happen so fast....mostly the load of dirt and stone go over the top of the bucket and the tires squeal on asphault. Speed kills....I like range #1 with 1900 rpm....low and slow for us conservative guys. ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2003-07-17 59674
My problem is not lugging the drivetrain, it's fixing the terrain afterwards. I live in an ancient river delta which means I basically live on top of a 65' - 80' deep sand belt.
If I try to scoop anything even close to packed in middle range on my 4310HSTC I get 4 holes under my 4 R4 tires faster than you could believe.
So instead it's 'low and slow', just like I fly.
Best of luck. ....
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| DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2003-07-17 59679
Murf, I have the same problem on the sand dune I live on.
Even the skimpy little "bar-turfs" on the BX will dig holes up to the axles if I am not careful.
The only thing that works well for me are turfs, the wider the better, and ballast. ....
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