68 930 CK Hydraulic Issue

Dalet · Mar 18, 2012

Sorry for the long winded story.
I have a 68 930 that I took to the shop about 10 years ago when I was using it for farming. I spent about 1500 to get the hydraulics all working as I was going to use it for round bales and running the haybine. Well, I got it back in November 2002, and put it in the shed. I quit farming in 2003 and its been sitting since.<br>I threw a battery in it and sure enough it fired right off, but of course the hydraulics work as good as they did when I took it to the shop so many years ago. <br>

Anyways, the pump seems to be cavitating. Anyone know of a reason for this? I have flow, but no pressure.

DKase · Mar 18, 2012

Get a 4' hyd hose and install a quick coupler on one end that will fit your remotes. Plug it into any remote and run the flow from the hose into the dipstick hole where you put oil in. It should run a full flow of pure oil with no air in it. You can run it into a gallon can and time the flow. In the can you will be able to see how much air is mixed with the oil. Any air in the oil means that it is leaking into the suction line into the pump. If the flow is low it could be the suction screen plugged. It should fill a gallon can in about 10 seconds at an idle.

Dalet · Mar 18, 2012

Thanks for the response DK. The oil is full and clean. The tractor has extensions on the outlets, so I pushed in the ball and it sprayed all over the tire and wall of the shed. Its foamy, so that is why I was think it was cavitating. I shouldn't be able to push in the ball with my finger while its idling though either. There isn't any pressure.

DKase · Mar 19, 2012

There should not be any pressure there unless you activate the valve.

Dalet · Mar 19, 2012

Sorry for not explaining myself clearly. I pushed in the ball with my finger and then hit the lever for that hose and it shot out. If I would have the proper pressure on the pump, it should have pushed the ball shut, my finger isn't that strong.

I pulled the tank off and am ready to tear into the valve body next. I have the service manual and it shows an exploded view, so I guess that's the next step.

Brokengun · Mar 19, 2012

Dalet take a hydraulic coupler/male end off a cylinder and screw a 2000 or larger pressure gauge into it and then plug it into the hydraulic outlet activate/move the hydraulic lever and then tell us what the pressure is.

There is a good chance the seal for the pump has dried out and it’s not sucking oil or a little moisture in the system has caused a problem.

Let us know what you find out.

I’ve had this problem several times with my 930’s more than likely it’s an easy fix that will just take a little time to work out.

P.S. what did they do (replace) to (on) the tractor hydraulics’ 10 years ago?

Dalet · Mar 20, 2012

Thanks for the response Brokengun.

It shows less than 100 psi on the gauge. Barely moves the needle, but shoots out the fluid.
I have the receipt in the file somewhere, but I know the pump was replaced and the valve body was gone through. I will have to keep looking because I know the receipt is here somewhere. It is one of those things that is just eating away at me why it won't work!

One other thing I noticed but it wasn't the issue was when I took off the pump, there were 2 gaskets. I thought maybe the thickness of the one gasket was enough to pull in air on the rubber washer inside that is squished. Scraped off the gasket that stuck to the tractor and left the new one on the pump. No joy. Oh well, still staring at it.

mopar66701 · Mar 21, 2012

slime covering the screen on the sump. mine did it. foamy fluid is all i got and no pressure. tore the back end off and cleaned it now its good.

Dalet · Mar 22, 2012

(quoted from post at 23:50:34 03/21/12) slime covering the screen on the sump. mine did it. foamy fluid is all i got and no pressure. tore the back end off and cleaned it now its good.

When you say tore the back end off, did you split the tractor? Can you get at the sump from the pump opening?

68 930 CK Hydraulic Issue

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