Does anyone possibly have a service manual on this machine. Hydraulics won't unlock to operate. Suspect pilot control valve or solenoid issue.
Is this a wacker neuson? If so post serial number
SER# AD00664 Mod#G3003 IT SAYS MUSTANG ON IT. Maybe it's before Wacker took over?
That is a WN machine that was cross branded by Gehl/Mustang under an agreement they had at the time. The most recent excavators are built by Yanmar for Mustang/Gehl.