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Mike,
I did your test today. I've had Lorn's 4 second clackety clack a couple
years ago. A couple other spurious / erroneous faults in my hydraulic
system had never produced a culprit behond adjusting the up / down
pressure switch set screws (except the free fall valve which has been
replace). Anyway, I saw 4 seconds the first time and 8 seconds the second time I
did your test. I get the impression I am one of the many that have my
spool valve installed backwards. Please tell me it's a no brainer to reverse it on my work bench. Would
love to here the gory details. Spare no text as I am a bear of a wee
little brain.
Larry Henney N360LH LNC2 IO-360 B1
16XS Ft Worth, TX
I've posted this before: A simple test to check if your spool valve is okay is to put the plane on jacks and raise the gear. With the gear 95% up, put the switch back in the down position. The pump should stop and reverse immediately, and the gear should start back down. If the pump just stops and then delays before reversing, then the spool valve is probably in backwards. Depending on the pressure switch settings, and the low-side pressure relief-valve setting, the delay may be a few seconds to maybe 10 or 20. In my case, it was closer to 20.
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