Hydraulic fluid.

[DONALD Oldaker]

I HAVE A massy Ferguson 50D INDUSTRIAL backhoe loader ser#9A353170 what kind of hydraulic FLUID do I use

 

[Midniteoyl]

Without owning one (but do own a 3400 industrial and had a TF-30), both of those and several places on the internet recommend GL-1 80/90 Sulfur free Mineral Oil.

Tractor Supply has it, as well as other places like NAPA: https://www.tractorsupply.com/tsc/p...actor-all-mineral-90-transmission-fluid-2-gal

I believe your MF 50 takes ~6 gallons.

 

[ddbtdd]

I HAVE A massy Ferguson 50D INDUSTRIAL backhoe loader ser#9A353170 what kind of hydraulic FLUID do I use

Before you buy anything, call MF and find out what they recommend. You can then decide between the MF product or match up the fluid to your preferred brand