Does the PTO SHAFT operate as per what you believe is correct ?
Is your 50 a Dual stage clutch assembly as per picture?
Drain oil from common HYD..TRANSS..DIFF CASE so as oil is below bottom threaded bore / hole...see picture..
Start Tractor...operate hyd lift controls and verify levers and operating as per picture....
Does your 50 have any after market auxiliary controls installed as to operate remote Cylinders / Rams?
Pics are from MF service manual..also of a MF 35 ..