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John Deere Tractors Discussion Forum
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Re: 4440 Hydraulic Update/Question

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Tim S

11-26-2012 18:38:18
68.75.23.93



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Your right WTW, and just about any farm you go to will have at least 1 or 2 SCV's slobbering or leaking through. I don't use the set up tool I set them by back feeding shop air pressure into the coupler, then I put them on my test bench and pressure test them working a 3X8 cylinder mounted in the bench at 2250PSI.

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WTW

11-26-2012 19:17:08
204.12.185.249



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 Re: 4440 Hydraulic Update/Question in reply to Tim S, 11-26-2012 18:38:18  
Tim, I find this interesting! I too have not used the adjusting plate for "many" years. I tell the green horns when they ask me how I can do that, If you understand how they work and know what you are doing I can get them closer to spec than they can with the tool. I check them with air pressurre after I set them. I set the older ones very simlar to the way you are in the photo. The last dealership I worked at we had a test stand to prssure check them with full operating prssure applied. I always wrote anual service specials to service these as like you said about every farm that had JD tractor around had one that needed attention. Still the best hydraulic control valve JD ever had in my opinoin.

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Tim S

11-26-2012 19:40:08
68.75.23.93



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 Re: 4440 Hydraulic Update/Question in reply to WTW, 11-26-2012 19:17:08  

here is pre wrote script discribeing my test stand...... To sum it up a bit, I have a 30hp motor spinning a jack shaft at 2,000 rpm"s with a pump on the left end that stays put, I have a shifter that puts it in or out of gear, and the valve between them shuttles the oil to one pump or the other, the other being a pump that will be tested,,the pump that stays put is for providing oil pressure when I"m testing components ..clear as mud,,,there is a charge pump below driving directly off the motor ,,there is a pressure gauge and flow meter on the cabinet to test the pump....there is a manifold at the lower part of the cabinet to hold the couplers in place, the left end is pressure, then the next(pale green) 2 are for testing SCV"s, they go on up to the top of the cabinet to a 3X8 cylinder mounted to a frame,,the next 2 couplers (the yellow ones) go up to a actual 4020 steering motor mounted at the top of the cabinet to test steer valve operation, I mounted a direction needle mounted where a front end would be, the next set of couplers (the brown ones) are for testing brake valves.. then the end coupler (the Blue one) is for return, a truck oil tank,for oil, an old oil cooler off a 7700 hydro for a cooler,,a nifty holding fixture on the far right, and a stainless bench to catch any oil and send it to my waste oil tank,,, mail me and I'll tell you more about it..

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