B7100 what is this mystery trans/PTO box

[aransas42]

I have a B7100D 6 speed manual trans with a hydraulic blade.

There is a mystery box mounted on top of my normal transmission that feeds the blade hydraulics and has a lever on the side. It also has a diagram showing various combinations of "creeping speeds" vs. High Low settings.

I assume that this means the lever works in conjunction with the High-Low lever somehow.
The lever has 3 positions.

Does anyone know what this mystery box is called and what it does?

It seems that it not only feeds hydraulics to the blade, but also affects my transmission gears.

I can not find any mention of this option in any Kubota manual. But, it looks like a genuine Kubota part.

Why would Kubota create 1 addon component that serves hydraulics to the blade and adds extra gears??

Can you refer me to the proper Kubota manual?

Thanks for any light you can shed on this.

 

[NIdaho]

Well I just sold my B7100DT (1981 vintage) and it did not look like your pictures. I had the little beast for 15 years so I am pretty familiar with the levers. Left side is PTO Speed select. Bottom Right is 2 wheel/4 wheel drive. Right middle is the High/Low Range for the Transmission. I am not sure what the top right lever is. This picture looks totally different than mine. Where do the hoses go? Is this a model B7001 (Gray Market) instead of a B7100