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Hydra-Mac Hydrostatic Charge Oil Pressure Questions
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<blockquote data-quote="Condor" data-source="post: 33261" data-attributes="member: 1887"><p>Hi, it's been awhile since I posted on this and thanks to all who helped so far. To update, my oil temperature is staying very cool, staying below 125F. I did some case drain flow tests, which were all at idle, with warm oil. At idle, it maintains full charge pressure with no load. Unfortunately, since both hydrostatic pumps are "stacked" together, they both share the same case drain. At idle, the case drain from the pair of hydrostatic pumps took about 50 seconds to pass about 2 quarts. I was able to test case drain flow to each hydrostatic motor independently, each one took over 3 minutes to fill the hose to my jug, indicating I had almost zero case drain flow from the motors. One could conclude problems with the hydrostatic pumps. Now my delimma is obtaining parts for these old obsolete Cessna hydrostatic pumps. I have contacted Eaton Tech support (who bought out Cessna) who stated there are no parts available. I have been working with a Hydramac vendor who got me rotating assemblies, seals and gaskets, but as of this date, is having trouble obtaining the correct plates that mate up to the rotating assemblies. The vendor is still attempting to locate these plates but it been months. Please note, the wear plates are not replacable in these pumps, the rotating assembly mates up to the pump housing plate. Before disassembly of the machine, I am research my options. I understand there it's possible to re-finish my existing plates by surface grinding, lapping, and other processes unknown to me. Can anyone suggest a shop that can perform this service? Thanks so much, Joe</p></blockquote><p></p>
[QUOTE="Condor, post: 33261, member: 1887"] Hi, it's been awhile since I posted on this and thanks to all who helped so far. To update, my oil temperature is staying very cool, staying below 125F. I did some case drain flow tests, which were all at idle, with warm oil. At idle, it maintains full charge pressure with no load. Unfortunately, since both hydrostatic pumps are "stacked" together, they both share the same case drain. At idle, the case drain from the pair of hydrostatic pumps took about 50 seconds to pass about 2 quarts. I was able to test case drain flow to each hydrostatic motor independently, each one took over 3 minutes to fill the hose to my jug, indicating I had almost zero case drain flow from the motors. One could conclude problems with the hydrostatic pumps. Now my delimma is obtaining parts for these old obsolete Cessna hydrostatic pumps. I have contacted Eaton Tech support (who bought out Cessna) who stated there are no parts available. I have been working with a Hydramac vendor who got me rotating assemblies, seals and gaskets, but as of this date, is having trouble obtaining the correct plates that mate up to the rotating assemblies. The vendor is still attempting to locate these plates but it been months. Please note, the wear plates are not replacable in these pumps, the rotating assembly mates up to the pump housing plate. Before disassembly of the machine, I am research my options. I understand there it's possible to re-finish my existing plates by surface grinding, lapping, and other processes unknown to me. Can anyone suggest a shop that can perform this service? Thanks so much, Joe [/QUOTE]
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Hydra-Mac Hydrostatic Charge Oil Pressure Questions
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