REFLECTOR: Hydraulic Fluid

[Rich Guerra]

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
>
>