You have my tractor! It's proper designation is B7100DT, the DT being for dual traction if it's 4x4. It's a B7100E if not 4x4. I bought mine at an auction about 7 years ago.
I have managed to acquire an owner's manual for the second generation
B7100 -- they didn't make them between 1983 and 1990 -- which has HST. The old tractors did not have a ROPS. You can and should get one from the Kubota dealer. It will add about 150 lb. to the back end of the tractor and save your skull if you roll it -- at least if you have the seat belt on at the time.
I just use normal tractor fluid in mine. The fill is on the transmission tunnel in front of the seat. The brand is not so important as having it meet the standards in effect at the time your machine was new. I don't think any tractor hydraulic oil on the market won't do that. The loader and tranny use the same reservoir, strange as it seems with the manual box.
I use 80w gear oil in the front diff. There are grease zerks on the front wheel boxes for keeping those filled.
Among other useful things, there is an adjusting bolt under the seat to regulate the speed of the drop of the 3 point and an adjustment at the base of the steering column in the front center of the operator station to take some of the slop out of the steering if needed. You can adjust your rear wheel track by loosening the large bolt on the hex axle clamps inside the wheels and sliding the wheels in or out as needed. There is a pin that indexes the wheel in holes in the axle. Your PTO works only when the clutch pedal is out, but the tranny could be in neutral or any other gear or range. I have 3 speeds on the PTO, which I think is standard. I find the 1st one most useful for bushhog work, using it in conjunction with 2nd gear while running the engine more or less wide open. The inner pedal on the right foot rest is a differential lock. The 4wd lever is also in that area, as is the range selector, which is marked with a rabbit and a turtle on the fender.
You can use 10W-30 year round in the engine, but make sure it's labeled "heavy duty", which means suitable for diesel engines.
There are grease points and adjustments scattered all around the thing. Give it a good going over, top and bottom, with a rag to clean things off and figure out what you're looking at. Keep it oiled and greased, wash it once in a while, and it will last a long time. Mine has somewhere over 2000 hours on it (the PO disconnected the hourmeter).
It can be tippy on hills. My loader is strong enough that I can lift the unweighted rear of the tractor off the ground while trying to pick up something too heavy. A load in the bucket will tend to make it lift a hind leg while crossing downhill slopes, even with loaded tires and 120 lb of concrete on the lift arms.
The rear lift can just about pick up my Huskee 48" bush hog, which weighs about 400 lb. If I reach back and grab the top link, it will lift and hold it. I use a 72" rear blade, but the manual says it should only have a 60". The 3 pt. lift capacity is supposed to be 400 lb. at the ends of the arms. The farther back the center of mass is, the less it will lift.
I hope this has helped some. Contact your dealer and ask for a service tech who has been around a while. He'll know more about it.
