Please help...Massey Ferguson 44C/Hanomag B11C Transmission Advice? Service Manual?

Good Evening Gentlemen...I'm a Hanomag/MF Newbie who's having real trouble with my mid 70's Massey Ferguson Hanomag 44C Wheel Loader with about 5k hours. Initially, it had been leaking oil and I assumed it was engine oil but it was not. The next time I started it, it would not move an inch and I have no Getriebe/Gearbox oil pressure, so I shut it down. The Transmission dipstick reads full but I don't know if this is the transmission, gearbox, torque convertor, etc.

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Please help...Massey Ferguson 44C/Hanomag B11C Transmission Advice? Service Manual?

Please help...Massey Ferguson 44C/Hanomag B11C Transmission Advice? Service Manual?