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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
453F Air in Hydraulic system
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<blockquote data-quote="OldMachinist" data-source="post: 3040" data-attributes="member: 437"><p>Okay here are the rusults of my pressure tests.</p><p>Charge pressure 80psi steady. Service manual says 75-85psi</p><p>Hydraulic system was 1350psi book says 1195-1245psi.</p><p>System pressure was tested at aux. quick coupler like the book says.</p><p>I adjusted system pressure to specs.thought that might have fixed it but problem returned as soon as I drove it around some and the oil warmed up. Pressure was probably off from me cleaning relief valve.</p><p>The service manual I have has two different pages saying where to check the charge pressure. One dated 5/97 and a revised page from 9/97 the results above are from the revised location using the charge pressure switch port. The page from 5/97 says to check it at the filter block drain port. I checked it at the drain port also and the pressure was 120psi. But I'm assuming the revised location is what they really wanted.</p><p>I had a tee with a valve and a piece of clear tubing in my test line below the gauge so that I could see what the oil looked like at both loacations and at the drain port I had good flow with lots of air. The switch port didn't seem to have any flow at all.</p><p>Well I'm done working on it for awhile until I can think of anything else or somebody suggests something.</p></blockquote><p></p>
[QUOTE="OldMachinist, post: 3040, member: 437"] Okay here are the rusults of my pressure tests. Charge pressure 80psi steady. Service manual says 75-85psi Hydraulic system was 1350psi book says 1195-1245psi. System pressure was tested at aux. quick coupler like the book says. I adjusted system pressure to specs.thought that might have fixed it but problem returned as soon as I drove it around some and the oil warmed up. Pressure was probably off from me cleaning relief valve. The service manual I have has two different pages saying where to check the charge pressure. One dated 5/97 and a revised page from 9/97 the results above are from the revised location using the charge pressure switch port. The page from 5/97 says to check it at the filter block drain port. I checked it at the drain port also and the pressure was 120psi. But I'm assuming the revised location is what they really wanted. I had a tee with a valve and a piece of clear tubing in my test line below the gauge so that I could see what the oil looked like at both loacations and at the drain port I had good flow with lots of air. The switch port didn't seem to have any flow at all. Well I'm done working on it for awhile until I can think of anything else or somebody suggests something. [/QUOTE]
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453F Air in Hydraulic system
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