560 killed new hydrualic pump HELP

Summary: New pump, fluid, O rings, Gaskets, inspected everything, reasemble, everything work for a short time and now nothing.

well i just got done going through the hydra-touch system with Tele-a-depth. i took everything apart, ran it through the parts washer blew all the passages out with air. i double and trippled checked the orface that has a screen (size 31) as well as the piston to make sure it wasnt stuck. i did all of this since i changed the pump, fluid and filter..the org pump went out and the fast hitch wanted to float where ever it wanted to when it was working. There were some times it was still under high preasure with the new pump so i moved the levers to run the fast hitch up and down and to get the air out of the lines, at one point it was pulling the tractor down so hard it would make the tractor stumble and shut the tractor off. Made more adjustments and put everything back together. Hooked to the field culitivator and it lifted it no problem. drive to the field let it down and everything is working great!! come to the end of the field and go to raise the tool and NOTHING... NOTHING but one hot headed guy that was ready to throw a match at it..!!! GRRR is there anything i missed? i've been using IH's online parts cataloge which is a great help. any input would be great..

The pump may or may not be toast now, can't say. When you get her running you have to establish that it does not stay on demand and it is most likely to do that after it has completely warmed up. Did the .031 orfice actually have a hole that size. If it has or had a check ball in them they will pean that hole shut and the seat is hardened so very difficult to drill out. The ones that had check balls had a cross drilled hole for a roll pin to hold the ball in. Provided you have no other reason for system staying on demand, like bent or missing roll pins where you switch from single to double action, the problem is unduoubtly caused by wear in the hitch teledepth valve land that controls the passage to the orfice. What I have done over the years is to progressively drill the orfice size out until I get a system that quickly responds to lever movement but does not stay on demand. Neutral regulated pressure should run about 30 to 60 psi, not over 100psi. You need to install a gauge right at the pump and observe it as tractor is being worked in the field until you reach these conditions unless you feel your able to readily determine it by ear. They will get so hot you can fry an egg on the housing and of course ruin all 0-rings , seals through out .

pete,

the orfice was marked 31 and it has a screen on the end of it. it has never had a check ball installed in the orfice port. should i remove the screen to allow more flow? every time i've had it apart i have cleaned it and made sure i could see through the orfice. When i first pulled the orfice out (due to org pump going out) the screen was smashed in on itsself. i desoldered it cleaned it and resolded it back on and made it just like new..(new one was over $50.00)

when i first fired it up it had very good responce from the system to the control levers. when it was making whining sound it was also making a pulsating sound and the 3/4in hose that goes from the pump to the hydra-touch system would pulsate with the pump after it warmed up from working ground and i had no responce. just went back to the field and fired it up and i was able to lift the cultivator.

The tractor has around 1300 hours on a working tach, did you see the wear on the tele-a-depth system around these hours? i could not find much slop/play in the linkages.

Don't remove the screen, and to clean them just cut the end off a bit, blow it out good and then roll the end back up a bit. Some tractors gave problems when new and then they improved the teledepth valve so it usually wasn't until they had a lot of hours on them that they would go on demand and stay there. The only way you can tell if wear is a problem is if the .031 orfice will not keep system off demand, (neutral if you will) after system is warmed up. Of course if you get the orfice too large it will not go on demand to lift load. If orfice is not screwed in tight it will leak around threads and not go on demand. I would sure want a gauge in pump outlet to observe pressure and pulsations. Those hitch valves can drive you crazy.