Combines 73c 74c vs 973

late build 973 heads will operate identicle to a 73C. The 73C has the feederhouse opening big enough for later TX machines and for CR_CX combines. To make the header hight work with CR_CX machines the wire harness and switches must be changed over to the potentiometer's that the 74C head has as standard. The 73C has full fingered augers but that can be installed on later 973 heads also. The only real difference in the 73C and a 973 is the reel and reel drive. The 973 used a chain drive while the 73C has a direct coupled hyd motor. I think the auger slip clutch was also changed from the 973. The 74C comes standard with potentiometer header hight sensors. I think they also shortened the length between the sickle and the auger floor from older models. They do make an electrical conversion to allow 74C heads to be used with TR machines.

Thanks for the info.

Some guys with 73C (rigid) platforms had a terrible time with them they would not feed evenly. the incoming grain would throw over the top of the auger in the center, usually from the same side. they fought it continually. NH people tried everything including changing the curve of the floor. Here's the solution I used. There are two sprockets on the platform auger drive shaft. I changed from the big sprocket to the small one to slow up the platform auger. That solved the problem for me.It seems the platform auger is running faster than the feederhouse chain. This worked for me. In fact I did the same thing on my 973-30 with the newer full fingered auger and it works great.