Dubbya Are
Member
Still fighting the hydraulics on my M-600 Bobcat.
When first started and cool it seems to work fine, after it warms up it starts getting slow and jerky and will finally quit lifting at all ... let it set awhile and it will lift again. I have rebuilt the main valve spools, variable speed valve, variable speed piston, new hydraulic pump .... I'm pretty sure now I'm dealing with air in the system ... I've found when it gets jerky I can raise the lift cylinders to the top a couple of times and it will work again for awhile (pushing air out I assume) Cylinders will slowly drift down also (haven't rebuilt any cylinders .. no outside leaks) Anyone ever dealt with this problem or any thoughts on where the air is entering from ... Thanks in advance for your thoughts and help.
When first started and cool it seems to work fine, after it warms up it starts getting slow and jerky and will finally quit lifting at all ... let it set awhile and it will lift again. I have rebuilt the main valve spools, variable speed valve, variable speed piston, new hydraulic pump .... I'm pretty sure now I'm dealing with air in the system ... I've found when it gets jerky I can raise the lift cylinders to the top a couple of times and it will work again for awhile (pushing air out I assume) Cylinders will slowly drift down also (haven't rebuilt any cylinders .. no outside leaks) Anyone ever dealt with this problem or any thoughts on where the air is entering from ... Thanks in advance for your thoughts and help.