Thanks for responses. The 773 is defiantly leaking hydraulic fluid. The leak is draining hydraulic resoivor at the rate of a couple gallons over two hours of operation. I followed the idea of lifting the cab, and moved around the foot pedals and forward/reverse( system under pressure) and we saw no obvious high volume leak, except lines that lead to the aux - hydraulic lines, which under pressure leak a little ( drips only). The fluid is gathering under the engine mounts and running out the right side. In adddition, a second area can be seen, With seat up, I did see fluid gathering below the seal where the hydrolic pump and the vale body meet. A couple or regular rubber hoses( not high pressure) hoses are near here and have 90 degree fittings that turn and enter the housing below the the pump.
Cleaning it is a good idea.
A mechanic spotted the leak that comes from the aux lines and stated they would not cause leaking unless the aux hook ups were used, yet fluids does drip from them while under pressure. I considered capping off this line from its origin below the seat. So ? What manuals would you recommend I find ? parts, repair manual, ? where is the best place to order. Number is 509640472. unit has 2600 hours. Thanks for the input.