where to start with early 4000 hydro issue

well i came home with a tractor the other day.
for the most part it is a 62 4000 industrial, light duty, power steering, 3 point hitch, pto, loader, etc. the thing runs great, but leaves some to be desired in other departments.

i am handy, worked on cars all my life (within reason) but the extent of my hydraulic experience is just with brakes.

where should i start?

what i do know is that it has fluid, and it appears the pump is primed, i pulled the plug off the top of the nose of the pump and when i turn the tractor over i get a little squirt. has fine bubbles in it there, but not at the dipstick.

when actuated the hitch levers twitch, though it is hardly noticeable, and i mean hardly.

where should i put a gauge to check PSI and make sure pump output is good?

i assume the pump is shared with the power steering, which works well.

what are the simple things to go for? the fellow i got it from was convinced, or trying to convince me it was just the relief valve.
is the hydro system on this the same as the 65+ i found an online manual for those, though the scans are poor...
thankyou, any help is appreciated.
sorry for what is probably a novice question...

Most likely a sticking unload valve. Search the archives, as this has been discussed literally dozens of times.

nless some custom work has been done.. ps pump should be on upper front right side of engine.. hyds pump for lift is lower right back of engine.

I agree with bern.. if you have flow but no lift. think unloader first.. and move on from there. there are of course other possibilities. if it is a stuck unloader.. you have no way to test pressure yet, as it is dumping to sump.

is the hydro system on this the same as the 65+

Click to expand...

No, the 4 cylinder 4000 hydraulic system is the same as the earlier hundred and '01 series. It is not like the later 65+ 3 cylinder thousand series.

thankyou Sean.

thanks, you are correct, the PS pump is up off the lefthand front of the engine.

i guess i will chase down the unloader valve first. take care.

thankyou Bern, i will search the archives. i am still trying to figure out this forum.