Hydraulics and fluid type!

[Arber]

This is embarrasing, I didn't think about the correct fluids so I went ahead and replaced them with normal (Sae 90 hydraulics&gearbox) 20w50 for the engine (Like on a MF 135). Well as it turns out my Ford model is from earlier types and doesn't have a shared sump meaning I ran my hydraulics on straight sae 90 gear oil for about 3-4 hours before I realised that my lift arms started to shake as they went up !
I don't see any burst O rings or oil leaks granted I didn't really lift anything during that period I just drove around, what type of damage should I expect if any and could it have possibly done any harm to the pump!?

I later found out the correct Oil type for it is actually 20w30 UTTO.

 

[oldnslo]

You probably didn’t hurt anything if you didn’t use hydraulics to lift a load. The thicker oil potentially starved the pump some but at low pressure should not have damaged anything.

Drain and refill with proper oil should be good to go.