Opening up a new topic here, since this is important stuff, but the old topic was on the 880CF. Don would it be appropriate and possible to move relevant posts to this thread?
Originally Posted by bigtimeoperator
What stubble height range are you able to achieve with that setup? Are you only using knife angle to change the cut height? Does tilting your knife forward cause more down pressure on head which subsequently causes feeder to lift (with AHHC active)? Are you referring to the white float pressure gauge on the header that houses the AHHC as your 1-2 height scale? At these settings are you cutting wheat that is relatively uniform in height across the field or are the hills shorter/draws longer?
Our durum is down quite bad and find we are leaving anywhere from 2-6'' stubble. On Case combines, 2013 FD70/2014 FD75, I've just been running manual height, knife angle at A-A.5, gauge wheels at 2nd notch from top. Cutting this short and in manual in unrolled, hilly, rocky ground is very stressful, unnerving and takes the fun out of combining. I'm going to play with mine some more to see if I can get AHHC to achieve similar results to manual operation.
We're running a Case 2152 with a 7120 and a 2162 with a 7230. Both work in AHHC mode.
Yes the white height indicator is on the header adapter itself. What we do when we first switch to wheeled mode is to set the wheels to the third position usually. Then make sure our main springs are the right tension. We lower the header manually until the white height indicator on the header adapter reads about 2. If the wheels' shocks are compressed to about the half-way position, that's good. Tip shouldn't matter at this point but mid-way is fine. Then we calibrate the header, probably about mid-tip. Say B or B and a half. After that we lower the header back down to its wheels and when the white header indicator reads about 2 we press the auto height button on the console to program that in. After that it just works with resume and shift-resume. And as you tip or untip the header, the combine will adjust the feeder height automatically, as well as compensate for terrain.
I think we normally cut wheat at 6-8", usually with tip about B. It's always pretty darn uniform especially as the header floats along semi-independently of the combine itself. Especially when we cross pivot ruts. Combine can rock a fair amount and the header just stays put. That's one of the things I like the most about having the suspension in the combine adapter. And we can tip the header down to D and scrape in the crop when necessary, and the header continues to contour automatically. If the crop is really lodged we might have to move the wheels to send position. But we picked up an entire circle last year lodged flat. Except for rocks we never worried at all about things as the header floated along over hills and dales just as expected.
Hope this helps some. I can't think of anything else special we've done. It's just always worked on our 2162 and 2152 headers. We run a Case 7120 and a 7230 combine.
Owing to the recent rain the combines aren't out right now, but I think as you lower the header, once the height sensor on the adapter starts to move and become active (as the wheels start to take weight), the combine switches modes on the header height display from feeder position to header position somehow. I'll have to take a look next time we are in the field, which will be soon hopefully.