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hill881

Hooked up implement valve now hydrostatic has not power

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hill881

I hooked up an implement lift valve and now the sunstrand 90-4620 hydrostatic does not have enough power to load tractor on to a trailer.  If I unhook the valve the hydrostatic has all kinds of power.  Is there something that Im missing or do I have the hose hooked into the wrong ports?  Does anyone have a diagram on how the hose hook to the hydrostatic and what ports.

Edited by hill881

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CasualObserver

First welcome. :WRS:

Next... pictures of how you have it set up will help.

And third... is this a hydraulic lift you are adding to a tractor that didn't have it before?  Did you add the "implement kit" parts to the hydro? There are two little pieces that make up a relief valve that have to be put in the port when you add a lift to a non-equipped tractor.

I'm going to edit your topic to add some tags. This will bring up additional posts at the bottom with related topics that have been covered in the past.

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hill881
IMG_0735.thumb.JPG.9a2045d618e3b80ffa35cIMG_0736.thumb.JPG.a7e42bd17b6b570cf574cIm not sure if this tractor ever had hydraulic lift on it before or not Im doing this for the owner of the tractor.  I believe it did not have it on before.  I did not add the implement kit to the hydro, ( did not know there was such a thing).  I have some pics as to how it is hooked to the hydro now.IMG_0733.thumb.JPG.90b1883746f3362c4d108

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hill881

Heres the model number and serial number of the tractor also if that will help

Mod# 1 0410 7
Ser# 851975

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wheeledhorseman

I've been looking at a couple of manuals for you - the photos are very grainy but from what I can see you've hooked up to the right ports. The photos are so poor though and it's difficult to tell. Also been reading the section of the sundstrand manual which covers the hydrogear like yours though in nothing like the detail provided for the later piston-piston type.

From my limited experience with the later type I'd hazard a guess that the charge relief valve (both types have these) isn't seating properly. The result is that when the impliment lift control is in neutral position, pressure in the main transmission is being lost. It's not being lost when the outlet port is blocked off.  I think you could test this theory by moving the lever to send the ram to the end of its travel but hold the lever there and see if power is restored to the drive system.

This is a wild guess and I'm sure others will chip in if I'm off the mark. Problem with hydrogears is that they aren't very serviceable.
 

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Trouty56

Generally that hose from the back comes right up over top and runs beside the hose that connects on the top.  There is a little spring and cone that installs in port in the front of the unit about where that cutout is on the side panel in that third pic.

screenshot.thumb.jpg.2c95d625cd6633b637b

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hill881

I have bottomed out the cylinder and the power does come back to the hydrostatic.  I will look at the charge pump relief to see how this looks.  Thanks for the help.  If anyone as any other suggestions let me know.

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