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Elmer or Baz - 780 Hyd. Problems

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TDK

04-15-2006 18:53:58




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I posted on 4-12 and both of you replied with questions. I answered the questions, but got no replies, probably because it's so far down the list now. Not only is the lift jumpy while lifting, it also jumps while holding the load up. And when lowering lift with load it works OK. When lowering without load, the spool valve sticks and must be pushed in by hand through the cover for the "rate of lowering" knob. When it does this it almost feels like it's not stickin but hyd. pressure is holding valve. Any help will be greatly appreciated !

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Baz

04-20-2006 01:51:28




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 Re: Elmer or Baz - 780 Hyd. Problems in reply to TDK, 04-15-2006 18:53:58  
I have reread your original message. The spool must not be sticking. I rebuild the valve chests and run them on our test bench. The spool can be moved by my finger with oil flowing and pressure on it. Oil pressure will not move the spool. You will need to remove the valve chest and sort the spool out.



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TDK

04-20-2006 19:58:31




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 Re: Elmer or Baz - 780 Hyd. Problems in reply to Baz, 04-20-2006 01:51:28  
It wasn't the spool sticking, but the lever rod dragging on the pipe that feeds trans. Evidently someone had removed or attempted to remove the valve at some time without backing out the bolt that holds the pipe.This bent pipe pretty bad. I appreciate your help, as well as Elmers.



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TDK

04-20-2006 19:55:38




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 Re: Elmer or Baz - 780 Hyd. Problems in reply to Baz, 04-20-2006 01:51:28  
It wasn't the spool sticking, but the lever rod dragging on the pipe that feeds trans. Evidently someone had removed or attempted to remove the valve at some time without backing out the bolt that holds the pipe.This bent pipe pretty bad. I appreciate your help, as well as Elmers.



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TDK

04-20-2006 19:55:02




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 Re: Elmer or Baz - 780 Hyd. Problems in reply to Baz, 04-20-2006 01:51:28  
It wasn't the spool sticking, but the lever rod dragging on the pipe that feeds trans. Evidently someone had removed or attempted to remove the valve at some time without backing out the bolt that holds the pipe.This bent pipe pretty bad. I appreciate your help, as well as Elmers.



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