REFLECTOR: Hydraulic Fluid

[Jack Prock]

Hi,

For anyone with questions about the Velo Hydraulic pumps, the guy
at the manufacturer to talk to is:

Bryan J. Anderson
Oildyne Division
Marketing Product Manager
Direct: 763-531-3513
Fax:  763-535-6483
Mobile:  763-229-7859

He is very friendly and very knowledgeable. He can answer any question you
have.

Jack Prock



----- Original Message ----- 
From: "Rich Guerra" <rich at rguerra.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>;
"ChuckJensen" <cjensen at dts9000.com>
Sent: Monday, May 25, 2009 10:18 PM
Subject: Re: REFLECTOR: Hydraulic Fluid


> Chuck,
>
> I had to rebuild the pump that was bypassing internally last year.  I
> never got around to posting pics of it and posting part numbers on my
> site.  Sorry.  The shuttle assembly is replaceable without tossing the
> rest of the pump.  Was ~$72 versus $$$$ for an entire new unit. You
> might confirm with factory exact info but my notes are as follows:
>
> The power section Part number is 642283, listed as "Adapter" and it
> cost $72.07.  The important part is that it has the "LB" shuttle in it
> for the "108AMS19-CLB-1VT" pump.
>
> You can get a new sump kit there too for a small cost if the old one
> is too grungy to salvage.  It has a nicer cap as I recall.
>
> Order it from: Western Fluid Power, 2759 South 300 West-H, Salt
> Lake City, Utah 84115.  Talk to Boyd Ottenstein at 801-486-6589.
>
> Hope this helps!!
>
> Rich Guerra
> Velocity XL RG N724X
> http://www.rguerra.com/velocity/
>
>
> > Update:      After trying/checking most everything, including
> > topping off the reservoir and checking the dump valve, which I
> > suspected was good because once I got the pump to prime and pump the
> >  mains up, the pump would shutoff and the valve would hold just
> > fine.   And, when the dump valve was opened, the mains and nose gear
> > came  down and dropped in place as expected.  Yes, the continuously
> > running pump is characteristic of an open dump valve, but that
> > appears not to have been the issue.
> >
> > When I removed the reservoir, I was surprise/shocked to find 100-150
> >  cc of milkish white liquid in the bottom of reservoir with black
> > globules suspended or settling in the milkish layer below the
> > stratified hydraulic fluid.  I assume the separated milkish layer
> > was water with hydraulic fluid emulsified in it from the vigorous
> > pumping.  Everything else seemed to be in order, but in looking at
> > the check balls with a magnifying glass, the surface looked like the
> >  surface of the moon, with craters and pits covering 15%-20% of the
> > surface.  The roto-gears, which pump the hydraulic fluid all appear
> > in good order, so it was mostly likely pass-by of the check valves.
> >  Given how corroded they were, it's surprising it worked as long and
> >  well as it did.
> >
> > The source of the water is a bit of a mystery.  Ken Mishler had the
> > reservoir off and cleaned when he was doing repair work over at
> > Malcolm's about two years ago.  He reported finding the same milky
> > garbage in the bottom of the reservoir.  One must assume is comes
> > from setting outside, but most of the last two years, it's had a
> > cover on it.  Very surprising that it could accumulate that volume
> > of water under those circumstances, but there's no other credible
> > explanation.
> >
> > I looked at replacing the entire unit or rebuilding the pump.  If
> > the factory has a repair kit in inventory, I'll probably go that
> > direction as the balance of the parts all appeared to be in A-1
> > condition.  In the mean time, I'll give USelessAir some of my money
> > to make a trip to Buffalo on Wednesday and hope to have good results
> >  to report on Thursday or Friday when I put things back together.
> >
> > Ken's recommendation was to use only 5606 fluid, though google
> > searches and other sources seem to indicate a lot of people having
> > used ATF successfully, with very few reports of any problems.
> > Oddly, 5606 is as cheaper, or cheaper than ATF, so it's not much of
> > a sacrifice to stay with the first line stuff.  Thanks for all the
> > ideas and comments.  It's always helpful to have second, third and
> > fourth thoughts.
> >
> > Chuck Jensen
> >
> >
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