Hi Gurus!

I'm having trouble with a Komatsu transmission. Earlier it looses drive when engine runs approx. 1-2 minutes. Nowadays engine just revs and truck goes nowhere. I've checked transmission oil and it's in max-line, even little bit over it. Oil is quite dark and I don't know when it's last time changed.

Specs: Forklift KOMATSU FD30H-8, serial #210213, 4-cyl. diesel engine, automatic transmission, 4-wheeler, manufactured in mid-80's (?).

Any suggestions ? Can it be torque converter, clutches or worn oil pump? Has anybody a workshop manual / parts catalog in PDF? I have to test gearbox pressures but I don't know right ports or pressures.

Thanks for any help!

-Gary-