Found this on the Portland OR Craigslist.

portland.craigslist.org/grg/hvo/5945536838.html

Is there a turbo lurking under that hood?? did i see the oil filler for a oil clutch ??? and nice tin ... tempting just a bit pricey to get it this side of the pond from that side of the US

The filter showing on the back looks to be for hydraulic system. Wet clutch on 9u has no filter as such,just a screen that is removed cleaned and replaced. I am looking for the hydraulic pump. Not on the front of crank,nor on the rear of transmission,have seen small pumps where the generator runs but this has what looks to be a generator in place. So where is the pump?

I'd suspect the pump is belt driven and mounted below the generator.

When I zoomed up on the generator side picture I can see the hydraulic lines hanging behind the oil filters and going down below the generator. Looks to be either belt driven as OM said or perhaps crankshaft mount if they found room.

I believe what Chesire Cat was referring to in his post was the oil clutch FILLER, or breather, which indeed can be seen below the starting engine almost in the middle of one of the hog panel squares. I agree the filter on the back is for a hydraulic system and I would agree with O-I-H that there are lines running towards the front of the tractor. Pretty clean looking ol gal and typical of PNW farm cats turned bulldozers.

BP