Hi Warren, is there plenty of oil in transmission? I am assuming since you changed filter and fluid that the hydraulic pump has lost prime. The other possibility is the pressure plate splines have stripped and PTO shaft is no longer turning to drive hydraulic pump. If you have an air compressor with a nozzle tip, you can try removing the hydraulic dip stick and applying some air pressure in the dipstick hole while running engine about 1500 RPM and working steering wheel or hydraulic loader valves. If that doesn't work, place a clean bucket under MCV valve where hydraulic filter is located. On bottom left of MCV should be the high pressure hydraulic line to the steering system, loosen the nut on the line a couple turns with engine running and that should let air out of the system and hydraulic pump to prime.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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