750 jd 3pt will not work

[tking]

I have a john deere 750 tractor, several months ago the rubber section hose on the low pressure hydraulic line busted. It took me some time to replace the rubber hose, so after taking the old hose off, the line stayed open for a month or so, until I put the new hose on, I did not use the tractor during this time, now after replacing the hose, and refilling the system with new hydraulic oil, the 3 point lift will not work,the lift was slow before the hose busted , but now it will not work at all. Can some one tell me what may be going on or what do I need to check.

 

[beenthere]

:welcome:
Can't tell you for sure, as I'm not sure just what you explained. But from what I can gather, you may still have some air in the system and might need to bleed the air off (or cycle several times to push the air out).
How much new oil did you have to add?
No mention of a FEL working or if there is one.
Be sure the 3 ph lift control valve is open (controls the speed of the lift).

Was the tractor operated at all after the line busted?

 

[tking]

Good evening, Super Member, before I discovered the hose had a hole in it I was operating the tractor, after replacing the hose, I put approx 4 gallons of oil back in it, according to the dip stick the oil is full. I do have a low volume of oil coming from the pump in the low pressure line, going into the rockshaft housing input line, but I don't have any oil, going from the rockshaft housing, to the rockshaft control valve. Also it has a valve set up for a frontend bucket but I don't use it the valve is old and rusty.