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Bobcat 763 C Changing flow rate
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<blockquote data-quote="TriHonu" data-source="post: 81798" data-attributes="member: 897"><p> <table style='width: 100%'><tr><td><span style="font-size: 10px">Quote:<br /> <strong>Bobcat_Ed</strong> - 'I have one other question on the backhoe side there is a third quick coupling I believe it to be a overflow return line is this ever used in my situation? Thanks, Ed'</span></td></tr></table><p>I have never seen a skid steer backhoe attachment with a 3d line. </p><p>Normally a third line is a case drain line. Case drains are used on hydraulic motors that need to reverse frequently. The motor has drain ports behind the seals so any oil that gets forced past the seals is allowed to drain back to the tank. Without the drain, seals can be "blown" when the flow is reversed.</p><p>You will most commonly find case drains on High Flow skid steer attachments utilizing a hydraulic motor. You don't commonly see them on low flow motors.</p><p>What model is your backhoe? Have you traced the line and located its source?</p><p> </p><table style='width: 100%'><tr><td><span style="font-size: 10px">Quote:<br /> <strong>Jerry</strong> - 'Check valve would not help since the aux valve is closed after angling the plow. It would have to be a two way relief of some sort between the two angle cylinders. Since the aux valve is closed the most damage you could do is blow a hose but there may be a set-up for this out there.'</span></td></tr></table><p>Been there. I caught the end of blade on a frozen drift. Most of us don't think about how much leverage there is from the end of the blade to the cylinder pivot point. If you impact load one end of the plow you create a large pressure spike. I didn't blow a hose on the plow, but it did find weak spot in the rubber line at the base of the boom pivot. Of course it was the outer line... </p><p>Most inexpensive way would be two pressure relief valves vented to atmosphere or you could add (2) additional tee fittings and two hoses. Since both cylinders are single acting you could "vent" to the opposite cylinder.</p></blockquote><p></p>
[QUOTE="TriHonu, post: 81798, member: 897"] [TABLE] [TR] [TD][SIZE=2]Quote: [B]Bobcat_Ed[/B] - 'I have one other question on the backhoe side there is a third quick coupling I believe it to be a overflow return line is this ever used in my situation? Thanks, Ed'[/SIZE][/TD] [/TR] [/TABLE] I have never seen a skid steer backhoe attachment with a 3d line. Normally a third line is a case drain line. Case drains are used on hydraulic motors that need to reverse frequently. The motor has drain ports behind the seals so any oil that gets forced past the seals is allowed to drain back to the tank. Without the drain, seals can be “blown” when the flow is reversed. You will most commonly find case drains on High Flow skid steer attachments utilizing a hydraulic motor. You don't commonly see them on low flow motors. What model is your backhoe? Have you traced the line and located its source? [TABLE] [TR] [TD][SIZE=2]Quote: [B]Jerry[/B] - 'Check valve would not help since the aux valve is closed after angling the plow. It would have to be a two way relief of some sort between the two angle cylinders. Since the aux valve is closed the most damage you could do is blow a hose but there may be a set-up for this out there.'[/SIZE][/TD] [/TR] [/TABLE] Been there. I caught the end of blade on a frozen drift. Most of us don't think about how much leverage there is from the end of the blade to the cylinder pivot point. If you impact load one end of the plow you create a large pressure spike. I didn't blow a hose on the plow, but it did find weak spot in the rubber line at the base of the boom pivot. Of course it was the outer line... Most inexpensive way would be two pressure relief valves vented to atmosphere or you could add (2) additional tee fittings and two hoses. Since both cylinders are single acting you could “vent” to the opposite cylinder. [/QUOTE]
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Bobcat 763 C Changing flow rate
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