Hi John, My first recommendation would to be to purchase a service manual if you don't already have one. The manuals are available from this web site. The 574/674 are basically the same tractor with D-239 engine but fuel pump on 574 is set to 52 HP and 674 is set to 62 HP and 674 may have larger rear tires. Re T/A (Torque Amplifier)- gives a change on the go Hi/Lo in every gear, gives the 674 16 FWD and 8 Rev gears. I believe on 674 it was an extra cost item and on new model 684 it was a standard item. You can tell if you have a T/A by having a lever on left side of steering column that looks the same as the throttle lever. Forward T/A is in HI(Direct drive), back towards seat T/A is in LO range.
Re PTO shaft not turning that is a good sign. Yes that is PTO clutch pack you see.
Re clutch inspection plate is sheet metal plate on bottom of bell howsing closest to rear of engine. I believe 2 bolts is correct plate.
The tach cable goes along left side of engine and behind the fan and over towards left font side of engine there is a "L" shaped tach drive assembly that is screwed into the timing gear cover.
674 is a great tractor and D-239 German Diesel is a great engine. Just one caution and that is REMEMBER to RELEASE the BARKING BRAKE before driving the tractor. Newer 95 Series and above tractors have replace parking brake dash light with a flashing light when parking brake is engaged.
Have a great retirement and enjoy your 674. I have spend many hours in the seat of a 674/684. Always will to help if I can.
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