TimBuck2
Bronze Member
I have a 30 year old Gravely zero turn mower with very little time on it (about 350 hours). I finally decided to change out the hydraulic oil and filter. I used what I had on hand for oil - Walmart SuperTech tractor transmission and hydraulic oil.
It took a while for the system to fill up (judging by falling level in in the intake side of the tank).
I believe all the air pockets are gone. The machine is up on jack stands, and the wheels are turning.
However, when I tried to run them full speed there is too much resistance in the hydraulic pump, and the engine starts to die.
The manual calls for using 20W-50 oil. I can't find any info on the viscosity of the SuperTech. If I can assume it is in the ballpark of by Kubota UDT specs, I am thinking it is something like 50 on the very pleasant 70 degree day
Anyone know whether this symptom is from too the oil being too viscus, or not viscus enough?
Any ideas appreciated before I start all over and see if the right oil was the right way to do it.
Thanks, Tim
Thanks.
It took a while for the system to fill up (judging by falling level in in the intake side of the tank).
I believe all the air pockets are gone. The machine is up on jack stands, and the wheels are turning.
However, when I tried to run them full speed there is too much resistance in the hydraulic pump, and the engine starts to die.
The manual calls for using 20W-50 oil. I can't find any info on the viscosity of the SuperTech. If I can assume it is in the ballpark of by Kubota UDT specs, I am thinking it is something like 50 on the very pleasant 70 degree day
Anyone know whether this symptom is from too the oil being too viscus, or not viscus enough?
Any ideas appreciated before I start all over and see if the right oil was the right way to do it.
Thanks, Tim
Thanks.