I think it has a ford motor. (150 hp) 190 bu grain tank, 6 row combine. A TR-86 is a better combine for a little more money. TR-75 was made in 1980 to 1985. TR-85 is the same as a TR-75 but a Cat motor.
I owned two TR-75's both had Cat engines. I refused to drive them because of the noisy engine sounded like a concrete mixer with few rocks in it. I much prefer the Ford engine. I would suggest a TR-86 with ford engine. The threshing and cleaning capacity of these machines exceeds the clean grain elevating capacity- so watch it in high yielding corn. be sure to get the high capacity bubble up auger. you have picked the right combine. It far exceeds the 6600 in capacity and RElIABIlITY.