lml@lancaironline.net Mailing List Archive

Thanks for the facts Lorn.

During the building process I could see lots of failure modes in the system. As a backup I ran a heavy wire from the + battery post thru a 50 amp circuit breaker, thru a high current push button switch to the down wire on the pump. The idea was that I could pull the primary system breaker and use the button to lower the gear if the motor and hydraulics were operational.

A brief push of that button would unlock the system.

Regards,

Bill Hannahan

wfhannahan@yahoo.com

From: Lorn H Olsen <lorn@dynacomm.us>
To: lml@lancaironline.net
Sent: Wednesday, February 1, 2012 7:33 AM
Subject: [LML] Re: 320/360 Hydraulic Pressure Switch

Again,

My Oildyne internal pressure switch came (set by Oildyne) at 1,500 PSI. How do I know? I parked my plane on the ramp at Newport News, Va in the evening. The temperature was 40°F. 3 days later, when I was going to take off. The temperature was 80°F. I looked at my pressure gauges. Both the up and down were at 1,500 PSI. I had to crack a nut in a hydraulic line to release the pressure. The gear would not go up or down, at this pressure. The emergency dump valve would not release, at this pressure. The pump would not run at all, at this pressure.

Now, I have Wolfgang's high pressure adapter in the system. It runs the pump whenever the pressure is high on both the up and the down side.

There is no speculation here. Just the facts, mam.

--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,800 hrs, N31161, Y47, SE Michigan

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