Go BottomHorsepower of B7500
 | Duane Pearl
Join Date: Posts: 1 
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2001-02-12 24161
I am certain that when I took delivery of my new B7500 last september that all the literature I read on the tractor stated that it had a 21 horsepower engine... Why then, is there a sticker on the side of the engine block that rates the engine at 23.5 hp? Are these two numbers reflective of measuring the horsepower at different points in the drivetrain? What then, would be the actual hp rating of my B7500? By the way, just rolled 50 hours this week with no major glitches up to this point. There was an inconvienient "jerk" in the hydrostatic tranny a few months ago, but was taken care of. This tractor has been the best money I have ever spent... can't imagine life without it now.
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2001-02-13 24172
tractortips.com, which is my usual source for specs, doesn't list the B7500--too new I guess. The difference between the two HP's mentioned is about right for a typical difference between engine and PTO HP. There are various definitions for HP, and various places in the drive train that are sometimes speced. However, PTO HP is the rating most commonly used. Perhaps the smaller rating you recall actually was PTO HP. ....
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| Todd
Join Date: Posts: 1
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2001-02-13 24191
In Kubota's liturature they list Gross and Net engine Horsepower. These seem to differ by only 1 to 2 HP and might account for the difference. I honestly don't know if my B2710 has 27 Gross or 27 Net engine HP, but it only has 20 at the PTO. I think the 7500 has 16 or 18 at the PTO, but that will vary some between Hydro and Gear drives, gears being more efficient than a viscous coupling. ....
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| Duane Pearl
Join Date: Posts: 1
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2001-02-14 24234
I asked my dealer when I went up to get filters what the 23.5 hp rating was. He seemed to think that 23.5 is what the engine actually dyno's at, and that 21 is an under rated figure for Kubota's literature on their equipment. I wonder if all the manufacturers under rate their equipment like this? ....
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2001-02-15 24254
The numbers on the engine are the gross engine horsepower for industrial applications. Kubota engines are used for many different purposes and applications. The numbers you saw is the rating for those application. You have a 21 horsepower rating on the gross horsepower on a B7500 tractor. ....
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| KlayW in MI
Join Date: Posts: 1
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2001-02-15 24270
DP, What was the fix for the tranny trouble? ....
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| mbjacobs
Join Date: Posts: 1
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2001-02-16 24273
SAE gross horsepower: A production engine's actual power available at the flywheel or output shaft (usually crankshaft) as tested with an absorption dynamometer. It differs from SAE net horsepower in that many of the accessories (such as alternator, water pump, etc.) are not attached.
SAE net horsepower: The brake power (power available at the flywheel or output shaft -- usually the crankshaft) of a fully equipped engine fitted with all the accessories necessary to perform its intended functions unaided. ....
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| Duane Pearl
Join Date: Posts: 1
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2001-02-16 24284
Well, clay, after weeks of researching different kubota dealerships and with some help from the fellas here at the ctb, I found out that the jerk was being caused by by an excessive amount of spring pressure inside of the two hydraulic valves located underneath the plastic cover beneath the seat (one for forward, one for reverse). My dealer at first was unable to figure out the problem, but after prodding their local rep., decided that each of those springs needed to be shortened by 1 turn. We had a heck of a time getting the one plug out of the valve because paint had ran down inside... I ended up taking the whole valve to work and tapping a small 4-40 hole about .100" deep in the plug and making a small puller out of a 4-40 screw and some tiny washers. When we finally got the valves apart and cut the springs, we found that no real change occurred in how the transmission acted. To sum it all up, the rep finally told us that if all else failed, to just take the springs completely out. So that's what we did and the thing works just as smooth as glass now. I think I understand the theory behind the springs and why the valves are even there... to have a "creeping" mode and a traveling or pulling "mode".... but we never could get them adjusted right, so now, basically the tractor is always in traveling mode... but with as smooth as the pedal is, you would never think it should be any different than it is right now. It wasn't a problem that would ever have hurt anything or damaged the internals of the tractor in any way, it was just a little uncomfortable. And it definitely wasn't enough of a problem to ever make me think that I didn't buy one of the best and well built tractors on the market. ....
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| KlayW in MI
Join Date: Posts: 1
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2001-02-16 24297
Thanks for the info, I remember something about this a couple of months back but never heard the results. My 2710 would on occasion have simular symptoms but rarely. The 7500 is a 2 speed tranny, high and low isn't it? ....
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| Duane Pearl
Join Date: Posts: 1
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2001-02-17 24302
Yes, the B7500 has only a high and low range... To tell you the truth you couldn't hardly feel the "jerk" in low range, but it was pretty significant in high range. The only way you really felt it in low range was if you were pulling a load. It was also more pronouced when the ambient temp got down around 20 or 30 degrees. I am sure Kubota is aware of this little glitch... if you dig deep enough you'll find info about it like I did... I wonder if someday they will offer a new set of valves that will actually be able to do what the original ones were intended to do. I doubt it... I don't think it is a common enough problem, nor is it damaging to the tractor in any way. ....
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