Okay,now I understand.It is a production type machine and yes I do have info on these but failed to make the connection.Since we no longer have the 3CH,It was my partner's and he sold it to another member of the PM site,he might be very inertrested in the trip dog patterns.His PM site handle is (GFS,recently changed to Forrest Silas),I think and he now owns the 3CH we had here.He's on eheck of a nice guy and an avid and accomplished machinist.Now that I know what we're talking about I may offer some thoughts.The 3CH had a simple valve body somewhat like that of an auto transmission,although not nearly as complicated.Able,this might be part of the problem.Over many years of use it,like an auto trans,could have a valve sticking,weak valve spring or even a broken valve spring.I'll look at our production 1H info and see if I can find anything.After looking at the picture of the table again I'm not sure the trip dog patterns would be any good for the 3CH since it has double T-slots on the front of the table and takes a total of nine trip dogs IIRC.