Posted by Bob Huntress on March 09, 2012 at 23:23:53 from (184.41.97.44):
In Reply to: Re: Shermanbackhoe posted by Hydraulics on March 09, 2012 at 22:32:10:
Air or any gas, compresses, and is bad to have in a hyrdaulic system. For a small system, such as a small backhoe, I would put the hose fittings to the cylinders on loosely, start at one end of the first cylinder (the side of the cylinder where the piston is), with the pump operating start sending fluid thru the line, until you have a solid air free hydraulic fluid and tighten the fitting. If you are starting with one of the double acting, which the major ones are, apply enough pressure to move the ram to the other end of the cylinder, and repeat for that end of that cylinder. Do this for each cylinder that has been removed from the system. The remaining air will be very little which should easily cycle thru. I've done some big system where you tighten one end of the hose and start pouring hydraulic fluid into the other end.
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