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[QUOTE=oldchevy1;197169] I have a JD 650 which I believe is a rebranded Yanmar. I have had air get into my hydraulic lines because I have a whole somewhere in one of the lines. Anyway, sometimes when I park my tractor for a while and then start it up, the hydraulic activited devices will not work. I end up having to bleed the air out of the lines by loosening the big nut on top the hydraulic unit that sits just under the seat. With the tractor running, I loosen that nut with a breaker bar and right size metric socket. You can hear the air escaping then suddenly with a sputter it will spit out a mixture of air and hydraulic fluid. I quickly tighten the nut after the fluid starts flowing out. I have learned to pack the area surrounding the nut with mechanic rags to catch the spray. I also put a catch basin under the tractor directly under the seat. It will make a huge mess, but it will allow me to operate the hydraulics. When I mean spray, it sprays everywhere. Use old clothes and eye protection. I have started replacing hydraulic lines trying to fix the problem with air getting into my system. [/QUOTE]
Thanks that might be it because I did loosen that fitting when I replaced a seal in the front of the transmission. I will try that and see if that will fix it. Thanks.

Hydraulics Won t Work
Yanmar Tractors
Replies 6 Post by victory51