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Central New York | Update for tonight - thank you for all the information provided so far. I'll try to answer the questions above.
First - I went over after work and started the tractor to move it near the shop and pressure washer. 1st I verify that the dump valve rod is connected and working properly. Then, cold start and I have no warning light and the TA works normally. In 3rd low with the TA in high I can step on the brake to the point the tractor almost stalls and it does not drop to low. Shifting high to low works normally. Would this be possible if the TA was failed? It seems that if it was leaking oil internally from a seal it would do it regardless of temperature.
After the wash by the time I move it near the shop the light is starting to flicker in high. Attach a pressure gauge to the sensor port and restart the tractor and see 10psi in high and low. Stepping on the brake drops the pressure to a hard 0. Putting the handle in between does not measurably raise or lower the pressure.
Next I pull the flow divider spool per gd856. The spool is not stuck but is a little sticky and not smooth. The spring is on the inside (farthest away from the plug that holds it in). The spool shows some light scoring and I can't tell if the hole in the end of the spool has oil in it or a piece of debris. I haven't found the small plug underneath it yet. I will finish that and test after I put the spool back in; should it be lightly sanded with 400 to smooth it up?
I will also check the pressure in the morning when everything is cold again, but it did not take much warming to bring the light on and shut down the TA.
jalopy - thanks for the information about the transmission brake and the MCV pump. Maybe I can adjust it to help with shifting out of neutral - I did see an arm in that MCV pump area and wondered what it did. Also - the oil level was at the bottom of the stick, not the bottom of the add line (my fault). It took about 7 gallons to bring it up to the full mark, and I've added 5 additional gallons over that. I won't run it unless I have to, but I've got nothing planted yet due to weather.
Jim Naden - I'm a little confused by what you wrote. If the steering pump on my tractor was weak and it supplies oil to the MCV would I also notice steering and/or brake weakness? I understand there isn't a pump mounted to the MCV and see the steering pump under the tractor. Thank you for the diagram and the other page - I've ordered a service manual but it's not here yet. Since my steering, brakes, and seat are working normally that would lead me to think the pump is ok?
I've attached pictures of the pressure at idle and 1800rpm and also a picture of the spool valve.
 (IMG_5794.JPG)
 (IMG_5793.JPG)
 (IMG_5797 2.JPG)
Attachments
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 IMG_5794.JPG (116KB - 125 downloads)
IMG_5793.JPG (136KB - 135 downloads)
IMG_5797 2.JPG (81KB - 123 downloads)
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IH 3588 hydraulic warning light, TA issues help (details)
