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Prime mover Hydraulics
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<blockquote data-quote="Tazza" data-source="post: 73495" data-attributes="member: 82"><p>POssibly even try having the machine on blocks, remove a hose from each drive motor and operate the levers, see if you get oil out.</p><p>The pump should be a piston pump, so even if they installed the wear plates (if fitted) it will still generate pressure, but possibly not enough. So i can't see that they have messed up with putting it together. Have you checked for any rotation marks on the pumps to confirm that the engine is rotating it that way? just to be sure. If the gear/vane pump was backwards it could cause this issue, but if your lift and tilt work, it seems it's rite.</p><p>Charge pressure, you *may* be able to check it at the filter, there may be a pressure sensor either on the pump or around the filter that you may be able to tap into and install a manual guage.</p><p>Most systems on skid steers are pretty well the same. Oil goes from the main hydraulic pump to the control block, out to the oil cooler/filter back to the hydrostatic pump to generate charge pressure, the rest goes back to the tank/main hydraulic pump.</p><p>Could a hose be wrong? are you getting oil to the oil cooler/filter? is there a hose from the cooler to the pump?</p><p>Sadly i have never worked on one of these, so i'm working from what i remember of bobcat machines. It's a good guide, but there are always subtle differences.</p></blockquote><p></p>
[QUOTE="Tazza, post: 73495, member: 82"] POssibly even try having the machine on blocks, remove a hose from each drive motor and operate the levers, see if you get oil out. The pump should be a piston pump, so even if they installed the wear plates (if fitted) it will still generate pressure, but possibly not enough. So i can't see that they have messed up with putting it together. Have you checked for any rotation marks on the pumps to confirm that the engine is rotating it that way? just to be sure. If the gear/vane pump was backwards it could cause this issue, but if your lift and tilt work, it seems it's rite. Charge pressure, you *may* be able to check it at the filter, there may be a pressure sensor either on the pump or around the filter that you may be able to tap into and install a manual guage. Most systems on skid steers are pretty well the same. Oil goes from the main hydraulic pump to the control block, out to the oil cooler/filter back to the hydrostatic pump to generate charge pressure, the rest goes back to the tank/main hydraulic pump. Could a hose be wrong? are you getting oil to the oil cooler/filter? is there a hose from the cooler to the pump? Sadly i have never worked on one of these, so i'm working from what i remember of bobcat machines. It's a good guide, but there are always subtle differences. [/QUOTE]
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