Phantom Hydraulic Leak

[truck854]

I recently purchased 90/92 Bobcat 763. I was running it for about one hour doing light work and suddenly all the hydraulic oil ran out the hole in the bottom of the skid pan. I have lifted the cab and can not fine any bad hoses or where it was leaking. I have put more oil in and it does not appear to be leaking thus I still cannot find a leak.. Any ideas of why it dumped all the oil or where the leak might be? HELP?

 

[Tazza]

If oil is leaking out but you can't see it, it will be in the chain case.
Either the motor carrier seals that are behind the drive motors are bad or the case drain filters are plugged up causing pressure to build up and push past the seals.