Hey everyone its been awhile since i rebuild an accumulator bottle, so i rebuilt this hydac 4l bottle on a older putz. everthings great except i am leaking oil from spacer and bottle. i put a new split ring, new bag, then new oring, backup ring spacer then locknut i only tighten a little with spanner wrench. i tried tighten that only made it worse. what did i do wrong any help would be greatly appreciated  ! 

What is the nitrogen pressure at after the rebuild? Maybee it might need a bit more precharge if its down to seal the o ring of the bladder against the housing

i charged to 90 bar and waited 30 mins and it was low so i filled it again to 90 bar then waited 1 hour and checked again. it is holding right at 90 bar. but i will check again today

So, is it leaking hyd. Oil or is the gas pressure not holding? If oil is leaking out, you probably have a oring, that was squeezed out of place during assembly, or some dirt that could prevent forming the seal. If the gas is leaking, check your schroeder valve, if that is good, you need to replace the bladder again

no just oil i replaced that oring twice. how tight do you usually tighten the locknut?

Make sure you use a spanner wrench, and tap it with the hammer; since you are dealing with o-rings that create the seal, it needs to be tight, but not overtight,