Date: Mon, 14 Dec 1998 00:54:22 -0500
From: Marvin Kaye <74740.231@compuserve.com>
Subject: Re:LC20 Hydraulic Power Pack
Sender: Marvin Kaye <74740.231@compuserve.com>
To: Lancair Mail List <lancair.list@olsusa.com>
Message-ID: <199812140056_MC2-636A-F7BE@compuserve.com>
Mime-Version: 1.0

          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>
Posted for "Angier M. Ames" <alphadog@nii.net>

Figure 14-4 in the manual shows the master relay, both high and low
pressure
relays as well as the hydraulic power pack all attached to a plate which is
then grounded to the battery - terminal. Does it make sense that all these
items require a common ground? I don't think so.

The power pack itself has both a large red and blue lead and a smaller gage
black lead. The manual very clearly states in more than one place that this
black lead should be cut off close to the case and taped since it is not
used.
I had a discussion this week with the folks at Oildyne and they thought
this
instruction was most bizzare. Apparently, there is a thermal switch inside
the
case to protect against overheating and this is the ground wire for this
circuit.

Maybe I'm missin something here but I don't understand any need to ground
the
case of the master relay or the power pack. My inclination would be to
ground
the cases of BOTH the high and low pressure relays ONLY via connection to
the
thermal switch black lead coming from the power pack itself. This way, if
that
thermal switch breaks, the relays would lose current and shut off the power
pack.

Does any of this make sense?


On another issue, could one of you LC20 builders identify a use for part
#R6.
The package description says "spring 9" PC compression"

Thanks,

Angier Ames