1655 rear end oiling/filter

I changed the oil and filter in the transmission/rear of my 1655 this weekend. I last did this ~5 years (700 hours?) ago. The filter I took off looked like it had never had oil in it. So I started the tractor with the filter off and no oil came out. What does this mean? Oil level is right to the plug, and tractor runs well with a quiet transmission.
Josh
 
Does not sound good! The early 1655 tractors used a countershaft driven lube pump. Later tractors used a chain drive pump. Now I would keep the transmission in the lower neutral and used those gears as well. Drain the oil out and remove the plug where the screen is and at least see if the tube is there.
 
   There is a lubrication pump in the transmission to supply oil to the input shaft, differential and the PTO.   Output of the pump goes through the filter and you have none!
   Early 1655 tractors, the pump was driven off the back of the countershaft and very last production had a pump that was driven by a small roller chain about the size of a bicycle chain.   In either situation you are going to have to remove the hydraulic system to correct.
 
So are the chain driven units more likely to fail, or less? This issue makes me want to add a pressure gauge to the trans lube on my 50 series tractors. Bummer Josh!
 
I am planning to pull off the hydraulic cover at the end of the week. Can I use the tractor about 2 hours in the meanwhile? It is setup much better for spraying than the other tractors. Or does it need to sit until fixed? Is it likely the pump failed or tube has come loose? I think this is an earlier tractor. Thanks,
Josh
 

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