My units are from the early 1980s, mostly, but for the 2500 series stuff
thas is more recent. Nothing leaks. About the only place that _could_ leak
would be where the top fastens to the tank, or where extenders connect to
one another. And, since there is no pressure in there, there would be no
reason for leakage.

I am examining my 2521 tank as I type this. Magnet drive, but that should
not matter any. You never fill a tank up to where it would leak out the
filler opening even when it is on its side. I used to have a 1500 series
tank, but did not like it when compared with the 2500 series. I tried to
give it away, but no one wanted it, so I threw it out. Sigh.

There is a rim around the outside about 1/2 inch down from the top edge of
the tank. The top is black with a red cap and a red attachment ring. The
bottom edge of the top has many springy fingers about 1/16" apart and about
7/16" wide. When the top is on properly the gingers seem to grip the rim on
the top of the tank. There does not appear to be any seal or o-ring there to
need replacing.

Is the funnel in there properly?

OTOH, the explanation that that much chemistry is attached to the materials
and the tank seems implausible; some, yes, but 140ml?!!!

Could you be attaching the top incorrectly?

Fill the tank to the top with water and stand it up somewhere very dry, and
see if it leaks, and _where_. I would not expect it to.

Those lifts do tend to become leaky with age but then you should see
your chemicals seeping out of the lift's housing somewhere. There is
some kind of a gasket in the 2-way contraption that switches between the
inlet and outlet. I've tried to repair this myself a few years ago but
that only made matters worse.

On a more general note: you'll want to think twice before you start any
attempt at doing your own repairwork on a Jobo. As solid as all their
machines appear from the outside and from handling them, once you open
any of them you'll be wondering how this could ever work at all.

I'll never forget the first time I opened an ATL-1: if I had made this
from stuff gathered at various DIY supply stores, I'd have been mighty
proud of myself. But as a commercial product sold for the equivalent of
a decent second-hand car...? A trifle odd, to say the least.

Ralf

I would start by by checking the red washer in the lid of the tank.
You could also try a "dry run of the processor by draining the water
out of the water jacket and no film in the tank. Put the tank in the
processor, turn on the agitation motor and fill the tank with water.
From there it's a matter watching for where the water is leaking from.

You do want to make sure to set the temperature control to the lowest temp
so the heaters don't come on.