Thanks for your advises, Daniel.
I understand that the prevous owner have contacted Cat service in Chile but they didn´t find a solution that change the electric motor every time it failed, with the last one with the fan included.
I agree with you about the high pressure in the hydraulic system, may be because a bad relief valve regulation or a bad calculation of the pump / electric motor rate.
As you mention, if we change the pump for a smaller one it can mean driving problems in a small rooms, like our cold storage.