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John - I purchased my current pump from Lancair in 2005.
My 90's-era pump frequently locked-up shortly after landing, becoming unresponsive to gear retract. Incredibly, shortly after landing, enough pressure built up in the high pressure circuit to open the high pressure switch, preventing retract. The only way to free it was to open a fitting to release pressure.
I returned the pump to Oildyne at least three times: the first time, I had the 'backpressure relief' installed, which did not correct the lock up. I returned it a second time, telling them about the lock-up. They 'bench-checked' and returned it, telling me there was no problem; but -of course- it continued locking up.The third time I told them "don't bench check it, just rebuild it"! They did so and, of course, it continued to lock up. From what I've read over the years, I suspect at least one-half of the older pumps had that problem.
Bill
----- Original Message ----- From: "John Cooper" <snopercod@comporium.net>
To: "Lancair Mailing List" <lml@lancaironline.net>
Sent: Tuesday, June 10, 2014 4:45 PM
Subject: [LML] Re: Oildyne Hydraulic Pump Rebuild?
Well this is a heluva note. I just called Michelle at Lancair and she informs me that since last October, Oildyne has stopped selling their power packs for use on experimental aircraft. It looks like I'm well and truly screwed.
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