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Message: <blockquote data-quote="OldMachinist" data-source="post: 9303" data-attributes="member: 437">After having the system open to replace the pump there will be alot of air in there. How long did you run it to try and clear the air? Here's how I was told to purge the system.Run throttle about half way slowly drive forward on a level suface and lift the bucket almost to the max. You don't want to max it out because then the relief valve will open. Tip the bucket slowly down and up while bringing the boom down. Again you don't want max it out in ether direction. Do this five or six times then let turn it off and let it sit for a couple of hours and try it again. If its better do the purging again until it runs like it should. The suction and system return line are connected together on this machine and any air that gets in is recycled thru the pump. If this doesn't clear the air from the system then air is still being sucked in or the anti-cavitation valve needs cleaned or replaced.The anti-cav valve is on the front of the valve body. It is the large plug above the tilt spool.  Take it out and clean it. You should replace the oring and backup washers too. It gets torqued to 35-40 ft lbs.More than likely the suction/return hose is leaking. Like I said in my earlier post the suction hose is at the bottom of the hydraulic tank behind the battery. It is nearly impossible to do anything but check it for leaks with engine in the machine. You need to clean all the oil and gunk from around it and let it sit overnight to check for a leak. Even a very small leak on the suction side will allow a lot of air in to the system. When your in there cleaning around it try to see it will move any at all. If its loose its sucking air. You can try to tighten it but I found no way to do this with the engine in place.Good Luck</blockquote>

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