Perplexed - Page 4

PaulS · #31 06-19-2014, 06:41 PM

Yes I should have known that the shaft would not hook up. I guess I am picking at straws due to the expense of the pump. I thought all along that maybe there was air in the system as I cannot conceive of how the system can purge itself especially the steering cylinder. Will do some more testing and looking tonight but my hopes are dimming. Will the pump from the one you have fit our needs.

Oak · #32 06-19-2014, 07:42 PM

The one I have is completely ruind. The shaft is damaged and the po machined out the charge pump trying to repair it. Have you contacted Rich?

PaulS · #33 06-19-2014, 10:32 PM

We changed guages to one that max's out at 600. We first tried in the top implement relief hole and got no pressure at all. We then switched to the middle hole between the hydro valves on top this hole just has a plug in it. There we got about 180 at idle and got about 340 at full throttle. There was no difference in pressure when we operated the rear lift lever or turned the wheel. We also rechecked the plumbing and all seems good there.

J-Mech · #34 06-19-2014, 11:48 PM

I'm sure the charge pump is bad. You might go ahead and pull it off and just make sure it isn't something that can be easily fixed. Like a broken o-ring on the back, or the small key on the shaft.

PaulS · #35 06-19-2014, 11:52 PM

Ok will do but why do you not answer your phone. Lol I suppose you don't want to talk

cengleman · #36 08-23-2014, 07:50 PM

Not sure if this was solved, but I just did a power steering unit rebuild on my 2072 and had a similar problem. I was very meticulous and assembled it according to the service manual.

I got it all back together and had no power steering, no hydraulic lift. I finally figured out the picture I had drawn of the hydraulic lines was drawn with all four wheels on the ground. I reinstalled everything with the tractor vertical (front wheels up in the air) and must have drawn my picture upside down. Somehow, I had the lines switched. Switched them to the proper placement and the it immediately worked.

However, the hydraulic cylinder for the mower deck works fast when raising the deck, but very, very slow when lowering now. Still trouble shooting that one.

PaulS · #37 08-24-2014, 11:10 AM

Yes my 2072 hydro problem(s) have been solved. We had hooked up all the lines exactly the same way they were when we got it. As it turns out we had two lines reversed also. At the time I was having computer problems and could not download the pics I needed to be sure I had things hooked up properly. When I did get the pic of the routing diagram of all the hydro lines found out that the pressure line and the return line were switched. Switched them to their proper locations and viola we had power steering and working rear lift. The power steering is fantastic when using the Johnny Bucket. My rear lift seems to be working well also. We lowered it and I stood on the lift arms and it lifted me like nothing. Right now it sits in the garage partially dismantled to fix a hydro leak at the cork gasket where it meets the tranny. Did you try to hold up the arms while lowering them with the hydro. It sounds like you are not getting hydro down power. Check that line for kinks and be sure it is hooked up properly.

Oak · #38 08-24-2014, 11:44 AM

Another thing to check is make sure your levers are centered in the dash cutout. If you don't get the spool valve in the same location you won't have as much travel in one direction with the levers.

PaulS · #39 08-25-2014, 10:55 PM

As a final note after we got the system fixed we had a different hydro unit and it was leaking. We replaced the cork gasket as that is where it was leaking and after all the work to replace it we still had a leak. Yesterday we took it apart again and replaced the cork gasket again using the black sealant and that darn thing still leaked at the gasket. As a very last resort we replaced the hydro with the one that was in it when we got it. This time we used the ultra grey sealant and after assembly had to wait till this evening to try it. I filled the tranny and temp hooked up the battery and fired it up. I tested the whole works and everything operates and after about 5 minutes shut it off and no leaks. We may have solved our problem but still have no clue why one hydro leaks and the other does not. Both are out of a 2072.

J-Mech · #40 08-25-2014, 11:00 PM

More than likely, it wasn't the gasket that was leaking.

On a side note, you shouldn't need to put any sealant on that gasket. Cork gaskets are meant to be installed dry. My experience: they only leak it if isn't installed dry. Sometimes even with sealant (silicone) they will leak. Reason: it makes the gasket slick and it "slides" out when compressed instead of smashing like it's supposed to.

I hope you didn't plug the hydro drain hole with silicone......