Hydro static fluid / drive problems

   / Hydro static fluid / drive problems
  • Thread Starter
#11  
Is the Power-Trac a piston pump, piston motor type system? I just confermed today that the pump on the swinger is an old saurer sundstrand hydrostatic pump. I only used John Deere Hy-Guard in my Deere compacts and just a tractor hydraulic fluid in the Magnatrac. It has a simple gear pump that isnt too picky on what oil is used.
 
   / Hydro static fluid / drive problems
  • Thread Starter
#13  
Well, yesterday i drained the system again and this time i undid all of the lines i could and worked all the cylinders back and forth manually to get all the fluid out i could, and i loosened the lines to the hydrostatic pump. I know its virtually impossible to get all the old fluid out of all the nooks and crannies. I refilled the system with ISO 46. I called NMC and thats what they recommended. Now with draining all the lines and components, and filling with new oil and running for the first time, the oil looked foamy. Is that normal since there is a lot of air in the system? The oil still looked a bit pink but not as bad. Hydraulics are a major pain to mess with when theirs contamination involved.
 
   / Hydro static fluid / drive problems #14  
If you have foamy fluid, then you are introducing air into the hyd system.
 
   / Hydro static fluid / drive problems #15  
Who or what is NMC?
 
   / Hydro static fluid / drive problems
  • Thread Starter
#16  
They are the company that bought out the swinger loaders back in 92. They renamed them NMC last year. Hear is a link to their site. NMC-Wollard
 
   / Hydro static fluid / drive problems #17  
If it worked before you drained the hydraulic system the first time, that would lead me to think it runs on motor oil, not hydraulic fluid.

First step is get a manual for it.
 
   / Hydro static fluid / drive problems
  • Thread Starter
#18  
xfaxman: The Oil that was in it was so badly contaminated with water, that I dont think it was working right. Like I said before I called and spoke with someone at NMC-Wollard about what kind of oil to use and they told me ISO 46. I also ordered the manuals for it, but they haven't come in yet. Im pretty sure the pump and motor are wore and could use a rebuild. Is there a reputable place to order parts for Sauer / Sundstrand?
 
   / Hydro static fluid / drive problems #19  
Im pretty sure the pump and motor are wore and could use a rebuild. Is there a reputable place to order parts for Sauer / Sundstrand?

Sauer Sunstrand became Sauer Danfoss and is now just Danfoss. There should be reputable rebuilders for this product in your area. If this is the older 20 series products they are semi-obsolete but I believe the majority parts are still available for rebuilds.
 
   / Hydro static fluid / drive problems #20  
I solved my foaming problem by replacing the oil seal on the Aux. oil pump. It was sucking air in. Was a cheap fix thankfully. Still using dextron oil just fine
 

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