international 404 lift arms not working

My 3 point lift arms will not move since I changed the fluid,filter etc. I did this in stages...I drained all the old hyrdaulic oil,repaces the filter ( which was not even working as all the parts were loose in the canister)this I did about six months ago.
I installed a new carb & got it running & was going to hook up the bushog & try under load. I then remembered I only put 6 gallons of oil in ....so I added the gallon #7...checked the fluid level plug ...no fluid in sight. I added another 5 gallons ...1 gallon at a time checking the level plug each time ....never did get fluid out of the level plug.
Questions...where all the extra fluid gone & why will my lift arms not work?
 
I have not checked the rear end...not sure how to do that.I have narrowed the not lifting to the pump I think as there no fluid in the intake or outflow lines.
 
Do the tranny and hydraulic system share the same sump on a 404... my 424 has SEPARATE sumps for tranny oil and hydraulic oil... the hydraulic reservoir is in the 3-point lift unit main casting.
 
I think the 404 has a common sump...the manual calls for 7 gallons.
I think my problem has to do with the hydraulic pump ...
 

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