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Date: Wed, 21 Oct 2009 07:47:33 -0400
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From: Lorn H Olsen <lorn@dynacomm.us>
Subject: Re: LNC2 Hydraulic Gear Operation Fix

Your assumption of my operation is not correct.  While the gear is up,  
HI pressure switch is SUPPOSED to be open. What you describe is how  
YOUR circuit works, not mine.

You are also forgetting that the Oildyne pump has thermostatic  
pressure vents that open at 1500 psi relieving the line(s) to the  
reservoir as necessary per factory specs. If you see 2000 psi, you  
have something wrong with your pump thermostatic relief valves.

Also, my module is is fully symetric and works equally for the HI and  
LO side.

Wolfgang
Wolfgang@MiCom.net

> From:	"Randy" <randystuart@hotmail.com>
> Sender:	<marv@lancaironline.net>
> Date:	Mon, 19 Oct 2009 13:37:35 -0400
>
> This looks like a relay that when it senses the Hi pressure switch  
> being open, while the gear is up, shorts and closes the Lo pressure  
> circuit. This will bypass the Lo pressure sensor when the sensor  
> opens from the hydraulic fluid expanding. This type of fix does not  
> stop the hydraulic fluid from expanding more and more as it heats  
> up. The hydraulic fluid expansion can damage the hydraulic system. I  
> have monitored this problem and have seen the Lo side exceed 2000  
> psi during this heat expansion in the summer months.
> If this relay sticks the Lo sensor circuit will be on all the time  
> regardless of the pressure sensor.
> The ONLY way to approach this work around for the Oildyne pump  
> problem is to REMOVE the pressure from the Lo side. Relieving the  
> expanding hydraulic fluid and put it back in the reservoir where it  
> belongs!!!!
> This type of "Fix" that simply bypasses the open Lo sensor and does  
> not relieve the expanding hydraulic fluid is insane and it's a  
> ticking time bomb for gear failure!!!
>
> Randy Stuart
> LNC-2