Hydro oil tank

[packy51]

I changed the hydro oil and filters three seasons ago on my 2019 54" SD Raptor. I have 50 hours till reaching 200 hours on the mower. That is the recommended time to change the oil and filters again. Everything has been fine but during these three seasons I've had to top off the oil (Castrol 20w 50) in the reservoir from time to time. I see no leaks anywhere. Are the hydros actually using up some of the oil during their operation?

 

[aldens]

Too be on the safe side change oil and new filters after 50 hrs. I don't believe sealed system should loose oil. Using Mobil 1 15W-50 fully synthetic.

 

[packy51]

Ok. I was following the schedule of doing the change after the first 75 hours and then every 200 after that. I'll change it before starting this season's mowing. I have 175 hours now.