Ford 9N 3-point problem

[Soundguy]

wow, you resurected a 3 year old post to post your new question.

Many people will likely NOT see it.

In any case. you say you have rebuilt your pump, including a new relief valve.

have you pressure tested it? IE... chain lift arms down and plumb a gauge into the test port at the rightfront of the base of the pump using an ORB fitting. . that port is NOT pipe thread.

My guess is you are not building pressure int he pump due to ill fitting parts valves/springs..e tc.

 

[Stimw]

I rebuilt one of those pumps once and I don't remember if it was on the 8 or the 9-N that I owned. ???
That Scotch-Yoke pump is the WEIRDEST hydraulic pump that I have ever seen!! What were they smoking??

 

[Bob419n]

There is a threaded port at the right front of the pump that is connected to the tube that feeds the cylinder. can i pressure test it from there? and how much pressure should it have?

 

[Soundguy]

There is a threaded port at the right front of the pump that is connected to the tube that feeds the cylinder. can i pressure test it from there? and how much pressure should it have?

Just like my post #11 said... ( i'll re-quote it here since it was not read or ignored )

have you pressure tested it? IE... chain lift arms down and plumb a gauge into the test port at the rightfront of the base of the pump using an ORB fitting. . that port is NOT pipe thread.

1500-1700-psi is expected pressure.

 

[Jerry/MT]

Chances are the control valve is not moving properly when commanded by moving the lift lever up. The valve could be sticking or the "T" shaped valve actuator rod is broken or is not in the sockets on the "H" control fork. I'm assuming you have no leaks in the system and that sounds like a good assumption since you say it drops 3-4 inches in 24 hours. That implies pretty low system leakage. Also see my post above.