How do you drain hydraulic fluid on Massey furguson 1440 v?

On the right hand side below the seat - in line with the front of the rear tire is a plug. If your tractor has a hydraulic filter it is just behind the filter. The plug may be painted yellow. If changing the fluid, you should change the filter as well. Your owners manual should explain all this - if you do not have a manual you should get one.