Hydraulic Press Machine

[Odumx]

What are the possible causes for the plunger of a hydraulic press not to go up

[tonyav]

Possible that the piston is bent.

[johnk]

When you say go up is it drawing in fluid or pushing it out?

[waterboatman]

Not enough fluid.

[waterboatman]

It's just started raining, :o{

[Canis_Lupus]

Whilst I concur with Waterboatman about low fluid level, but if this is two way cylinder (i.e. pressurized in both directions, 2 pipes 1 in and 1 out) then you must also consider what state the cylinder oil seals are in.