Netstal HP1500/870 1990pd - Overheating!

[Fedorchuk Dmytro]

Good day to everyone!

Please help!

Once we bought this Netstal. It was working fine with a small chiller and there was no problems at all.

But at one time everithing was changed - machine started to overheat very fast and we cant cool it even with much bigger chiller.
I dont really understand anything in chillers power but I know for sure that our thiller can handle 3 200T machines
but cant handle this one Netstal.

Also servo valves started to work unproperly:

- clamping/opening servovalve doesnt keep mold in one position and mooving plate moves slowly.

- loading servovalve (MOOG) - it seems to me that exactly this one heats the oil. Also hydromotor cant keep rotation level
to load 300grams of PS.

Servovalve photo attached.

I ask anyone who knows something about this machine or about moog servovalve to give me some advice!!

[Pilot]

hi,
it looks, that you have a issue with one hydraulic valve in the circuit.
please check the valves with IR camera if is possible.
You have a oil heat up on it.
Valve is not fully closed.
It can be also on hydraulic pump.
Please check also all filters (suction, hi pressure, oil filter).

[Fedorchuk Dmytro]

If i hear hissing in the valve does it mean something?

[Pilot]

yes, if the machine is not moving, the hissing means oil leakage through valve. the oil is under pressure and it generete the heat (shear in the liquid)