I have 2018 s70 only 300hrs for home use. this is what I noticed after using it here and there . is it air in the hydraulic fluid? should I be concern about it? it also make some noice when using the bucket lifting up and down. sometimes, the noice disappear at low rpm . it is come and go. I also noticed jerky movement while lifting bucket up with weight higher than 3-4 feet off the ground. any thought or advice? the machine runs fine otherwise.
looks like air in the oil to me. check the suction hose between the tank and pump. s70's (as well as 453/463) have a tendency to suck air in from the hydrostatic pump steering shaft seals.