666 3 pt problem

You are talking about two entirely different systems between your loader hydraulics and the hitch.

Does the hitch stay up when you shut off the tractor?

Just to verify and to be sure, I would put a load on that hitch. Pull the seat, it’s frame and the square cover. Start ‘er up and try to lift the load and watch that oil in the reservoir.

If you don't see any leakage (artesian-ing of the oil), put a pump in 'er. Very easy to do and it won't take you 15 minutes.

Now, if you do by chance get sprayed with oil (grin), you just saved a bunch of money ‘cause you have either a bad relief valve, cushion valve or leaky cylinder. But, I really doubt this will be the case.

Piggyback pump is the weak point; and if it is “trying” to lift but just can’t handle a load, you’ve got a wobbled out pump. This is a classic “bad pump” symptom.

Allan

I don't know how to answer that.

When the hitch isn't being asked to lift (no demand), the hitch pump's oil is re-directed on thru to the remotes for use in that area in addition to the main pump's oil. This is called "full system pressure" (both systems tieing together).

However, that relief valve down in the reservoir is called the "lift system relief" and is tested by putting the total system into full pressure by moving the lift lever on past it's upper stop.

This by the way, is how you can still lift an implement cylinder even tho that front pump has went south on ya.

Now, since the relief valve is calibrated to pop off and 'dump' at 1800 lbs, I want to say yes, it must control both systems at the end of the day in a fashion. But there is also a 1600 lb pressure relief at the flow control valve too.

So, I'm just not smart enough to answer you; have always kinda fuzzy 'bout that "full system pressure thing and never really understood it.

Maybe someone will jump in and bail me out on this?

However, I do know that the front pump does not "help" the rear pump in the hitch duties at all. That rear pump is solely on it's own, as far as I know. If the hitch pump goes south, the front pump can't return the favor and get that hitch up (I've tried it on occasion and it won't work).

Allan

Glad ya found your trouble. End game is that it should be a heck of a lot cheaper than a pump would be too.

And you don't have to drain all that oil! :>)

Allan