Medium and Heavy Trucks
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I believe the hydraulic tank is on the right side of the machine and is located above the pump. That system will not have any issue getting oil to the pump.
It is common for these pumps to crack the rotor if they are are run out of oil. If the pump was make noise when it quit. It likely went dry.
Install a pressure gauge on the pump line to see if any pressure is there. I am not sure you have a tap to access it on these old machines, it may need a lollipop adapter to test pressures. These are still available from the dealer.
Either way, the best way to know what happened is to remove the pump for inspection.
If you need more help on this, please post the full machine serial number with your reply.
Yes, it is the large pump. You will see the big suction line connected to it. A small line will connect to the valve in the tank.