I remembered I had a quart of old Chevron 80W-90 gear oil that I never used for the past 30 years at least. Just got a B6100 off of my brother who had it for 15 hours of use in one year, has 2166 hours on it when I met him to pick it up. Changed the engine oil recently. I've been going through and changing all the fluids, got the front diff and axle cases along with the steering box today, all on that one quart of old gear oil. What a job getting the fill hole plug out of the diff, then I thought I messed up by draining the oil first. Next time, I'll remove the wheels first like I did before tackling the axle cases, those were easy. Had all the tools put away and the remaining oil as well, then remembered the steering box more than likely took the same stuff. Worked out, the one quart was enough do it all and best of all, $1.89. 
Since the tractors paint is faded, it was assumed there might be water in the steering box, but it was fine, no water.
I changed the coolant Thanksgiving morning, another fine job getting to everything, as I changed the hoses also. There is a reason I found out why the bottom hoses clamp is placed in a certain position, so the right side screen will go back. The system flush was real easy, place a container under the bottom hose and pour fresh water in the radiator. Some crud came out, guessing consolidated minerals? and the big surprise, a thin washer about rusted away, 7/8" ID. Factory goof? Looked like straight coolant was used, it was dark, so I'm sure it did the tractor good, replacing all the fluids.
I have the hydraulic fluid and transmisson fluid to change next, as soon as the dealer gets the filters in that were orderd two weeks ago. I thought the UDT was for equipment where oil for both the hydraulics and transmission use one common reservoir, but I see this has separate systems, except the rear lift arms for the three point system which should work off the tranny oil.
Hope everyone had a good Thanksgiving, I went camping, took a campstove top oven and fixed a sweet potato and a game hen, along with fresh cooked cranberries over another small stove, nice meal. No close relatives and mom passed last winter, so no place to go.
Duane
Since the tractors paint is faded, it was assumed there might be water in the steering box, but it was fine, no water.I changed the coolant Thanksgiving morning, another fine job getting to everything, as I changed the hoses also. There is a reason I found out why the bottom hoses clamp is placed in a certain position, so the right side screen will go back. The system flush was real easy, place a container under the bottom hose and pour fresh water in the radiator. Some crud came out, guessing consolidated minerals? and the big surprise, a thin washer about rusted away, 7/8" ID. Factory goof? Looked like straight coolant was used, it was dark, so I'm sure it did the tractor good, replacing all the fluids.
I have the hydraulic fluid and transmisson fluid to change next, as soon as the dealer gets the filters in that were orderd two weeks ago. I thought the UDT was for equipment where oil for both the hydraulics and transmission use one common reservoir, but I see this has separate systems, except the rear lift arms for the three point system which should work off the tranny oil.
Hope everyone had a good Thanksgiving, I went camping, took a campstove top oven and fixed a sweet potato and a game hen, along with fresh cooked cranberries over another small stove, nice meal. No close relatives and mom passed last winter, so no place to go.
Duane
