Hello everyone,
This is my first post even though I have searched the forum and got help many times before. There is a thread that is almost identical to my issue. It is this one.
http://ift.tt/2iDgTSs
I have read it through a few times and I am still a little confused about the final conclusion for the issue. I would really appreciate if someone could post a schematic for the remote section and the loader valve. In the original thread I read:
1:Machine serial no says you have pressure reducing valve AND regulating valve.
Regulating valve controls 80psi back pressure to loader pilot circuit What is meant by controls 80psi back pressure to loader pilot circuit. By "loader pilot circuit" would that be between the remote and loader valve? Like there is always 80 PSI on all sides of the spool that increases when you pull a function to 550 PSI?
2:This was TightGTP post when he found the problem. Tight GTP was the original poster. ok so i was finally successful yesterday. after i changed the bad check valves, which were completely disintegrated, i still could not get the hydraulics to work. so at that point i swapped the main relief in the control valve with a known good one. still i could not get the unit to work, so i put the old one back in. at that point i replaced the hydraulic pump. then the headaches began. after all the troubleshooting i came back to the relief valve, come to find out the plunger inside had gotten chewed up and there wasn't much left. so the combination of the check valves and the hyd pump going bad took out the relief valve. so after flushing as much of the system as i could and replacing the relief valve and all is well again. i swapped the main relief in the control valve with a known good one. Is he referring to the relief on the loader valve?(Equipment valve?) So .... am I thinking right when I say, the valves were being stroked but the pressure to the loader control valve was so low it did not function? That after all the work the issue was not even in the pilot (remote) circuit? That circuit was in fact working well and the equipment pump was no good as well as the main relief?? Why the crazy issues with the pressure at the remotes? The steering pump should have kept them constant if the new check valves were working. That is even if there was zero at the loader control valve the steering pump would have held the pressure constant to the pressure reducing valve. Am I wrong? Am I missing something or misunderstanding?
I have replaced both check valves and cleaned the pressure reducing valve. No joy. Hoping to gain as much knowledge before jumping back in to it.
Want to thank everyone in advance for any help. I have considerable education and experience with hydraulics. If I could look at a hydraulic schematic I think it would be a great help. This forum seems to be the only place on the net that offers some good information on this loader.
This is my first post even though I have searched the forum and got help many times before. There is a thread that is almost identical to my issue. It is this one.
http://ift.tt/2iDgTSs
I have read it through a few times and I am still a little confused about the final conclusion for the issue. I would really appreciate if someone could post a schematic for the remote section and the loader valve. In the original thread I read:
1:Machine serial no says you have pressure reducing valve AND regulating valve.
Regulating valve controls 80psi back pressure to loader pilot circuit What is meant by controls 80psi back pressure to loader pilot circuit. By "loader pilot circuit" would that be between the remote and loader valve? Like there is always 80 PSI on all sides of the spool that increases when you pull a function to 550 PSI?
2:This was TightGTP post when he found the problem. Tight GTP was the original poster. ok so i was finally successful yesterday. after i changed the bad check valves, which were completely disintegrated, i still could not get the hydraulics to work. so at that point i swapped the main relief in the control valve with a known good one. still i could not get the unit to work, so i put the old one back in. at that point i replaced the hydraulic pump. then the headaches began. after all the troubleshooting i came back to the relief valve, come to find out the plunger inside had gotten chewed up and there wasn't much left. so the combination of the check valves and the hyd pump going bad took out the relief valve. so after flushing as much of the system as i could and replacing the relief valve and all is well again. i swapped the main relief in the control valve with a known good one. Is he referring to the relief on the loader valve?(Equipment valve?) So .... am I thinking right when I say, the valves were being stroked but the pressure to the loader control valve was so low it did not function? That after all the work the issue was not even in the pilot (remote) circuit? That circuit was in fact working well and the equipment pump was no good as well as the main relief?? Why the crazy issues with the pressure at the remotes? The steering pump should have kept them constant if the new check valves were working. That is even if there was zero at the loader control valve the steering pump would have held the pressure constant to the pressure reducing valve. Am I wrong? Am I missing something or misunderstanding?
I have replaced both check valves and cleaned the pressure reducing valve. No joy. Hoping to gain as much knowledge before jumping back in to it.
Want to thank everyone in advance for any help. I have considerable education and experience with hydraulics. If I could look at a hydraulic schematic I think it would be a great help. This forum seems to be the only place on the net that offers some good information on this loader.
No Hydraulics to lift the bucket Case 621 loader.
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