How can I tell oil pump is oiling top Tacsew T111-155

[DennisT]

I just got a Tacsew T111-155 that was stored is a shed for 10 years. It was mostly dusty but uncovered with the oil pan off.  I cleaned it up, manually oiled it and put oil in pan.  It sews great with the small sample of material I have tried so far.  The hook is definately oiling as I needed to reduce the flow to eliminate oil in feed dog but of course the oil does not need to lift as in the top oil circuit.  I cannot see anything happening through the bubble window on top nor in the clear return line ( I think) underneath.  I have played with the bypass hole opening and totally closed it, removed screen, inspected the pump impeller and made sure the vertical oil line was open by blowing a air through a straw.  I'm testing by running 2000 rpm on my servo motor for a few minutes at a time.  Any insight will me helpful.  This stuff is new to me. 

Edited June 9, 2018 by DennisT