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I addressed the problem by installing a (legacy?) three way dump valve. That added a return to the reservoir to bleed off pressures. Works perfectly, but was a minor hassle. I would have happily paid a few hundred for a simpler solution.
Matt
On Sep 21, 2009, at 10:33 AM, Lorn H Olsen <lorn@dynacomm.us> wrote:
I have determined that the problem is caused when the hydraulic pressure at both switches is high enough that not only does the pump not run but also high enough that when the dump valve is opened the pressures are still not relieved to be below the pump run setting. eg. If I fly high and the temperature on the ground, after landing, is 60 degrees farenheight more than the temperature in flight, the gear won't go up on the next flight.
An EE friend of mine, after seeing our hydraulic system schematics, talking to Lancair and talking to Oildyne, has come up with 3 solutions to the gear not going up and/or coming down. I am out of town and haven't had the chance to see the solutions. Would anyone be interested in a kit that solved the problem for $200 to $400.
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Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,615 hrs, N31161, Y47, SE Michigan
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