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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
440B Jumpy Hydraulics
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<blockquote data-quote="OldMachinist" data-source="post: 4341" data-attributes="member: 437"><p>I have a 453F that used to act just like yours. I replaced all the hoses, o-rings and put a rebuild kit in the pump and fixed it. I suspect that the pump kit and the o-ring at the hydraulic tank outlet fitting were to blame.</p><p>To check for air in the system if your machine is similar to mine and has a filter block. You can remove the filter drain plug(The pressure at that port is less than 100 psi.) and install a valve and clear hose long enough to reach the oil tank breather port. Start the machine and open the valve if the problem is air cavitation you will see bubbles. This will return the oil to the tank with out being sucked right back into the pump and also seemed to temporary fix it on mine until I shut it off and let it sit for awhile.</p><p>Let us know how it works out</p></blockquote><p></p>
[QUOTE="OldMachinist, post: 4341, member: 437"] I have a 453F that used to act just like yours. I replaced all the hoses, o-rings and put a rebuild kit in the pump and fixed it. I suspect that the pump kit and the o-ring at the hydraulic tank outlet fitting were to blame. To check for air in the system if your machine is similar to mine and has a filter block. You can remove the filter drain plug(The pressure at that port is less than 100 psi.) and install a valve and clear hose long enough to reach the oil tank breather port. Start the machine and open the valve if the problem is air cavitation you will see bubbles. This will return the oil to the tank with out being sucked right back into the pump and also seemed to temporary fix it on mine until I shut it off and let it sit for awhile. Let us know how it works out [/QUOTE]
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