Ever use ground pressure sensing for auto header height with a MacDon? - Page 6 - The Combine Forum
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post #51 of 73 (permalink) Old 12-21-2018, 06:42 PM
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That is a standard thing on ALL Lexions! No matter how old.

On the Joystick the Lift button left side is ground comp.and right side is cuttingheight.
If you tap it it short left it will go down to the preset setting you have to do.
Correct. To clarify terminology to a wider audience:

The Left button is AHHC (Active Height Control)...based on the lift pressure and/or the sensors on the head. Ground comp. (follows the ground)
*flex heads
*pickup heads
*Any other head with ground sensing sensors
*Heads running on wheels

The Right button is RTC (Return to Cut) --based on feederhouse angle position only.
* Rigid heads with no sensors
* corn heads with no sensors

It is amazing how differently "wheat" farmers and "soybean/corn" farmers see these two operations. "Cutting height" to a grain farmer is RTC; "cutting height" to a soybean farmer is AHHC.... Then different companies use different terminology.


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post #52 of 73 (permalink) Old 12-22-2018, 09:43 AM Thread Starter
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Originally Posted by Jeff-C-IL View Post
It is amazing how differently "wheat" farmers and "soybean/corn" farmers see these two operations. "Cutting height" to a grain farmer is RTC; "cutting height" to a soybean farmer is AHHC.... Then different companies use different terminology.
Itís confusion of terminology Jeff, when using AHHC the return to cut setting is actually return to not cut! Strictly headland turning.

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post #53 of 73 (permalink) Old 12-22-2018, 12:08 PM
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Terminology is SOOO much fun. As one of the manual writers for Headsight, you really have to work hard to find terms that "everybody" understands. I've had customers call and say 1) "Your manuals are the best that I've ever seen" and 2)"Your manual is the worst pile of ****, makes no sense" ---- about the same manual, on the same day!!!

We have a nice long constantly growing list of "right" and "wrong" ways to call things. (That has nothing to do with political correctness....)

During calibration, "Put the head on the ground" seems to be a simple statement, right?? These are all actual customer interpretations:

1) Just touch the cutterbar to the ground
2) Lower the head to operating height (middle of cutterbar stroke)
3) Just touch the sensor tips to the ground
4) Just touch the snoot tips to the ground
5) Pull head over a ditch and let it all the way down (sensors not touching)
6) Set the head down on a surface with a mound in the middle.

And every one of those guys had a perfectly logical reason for doing it that way. For instance, #6---trying to find a "hard" surface he pulled out on a crowned road. or #5, anybody run a CIH 2388 "Full Cal" ?

So --"Fully lower head on a flat level surface".

And that's just one statement! Now throw in regional differences, or translations--and some days I need a nice padded room.....
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post #54 of 73 (permalink) Old 12-22-2018, 12:40 PM Thread Starter
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At least Claas has cal procedure idiot proofed, having to hold up or down header control as instructed on screen.
The floating up of MacDon headers the biggest pita.
If only you only had to cal just once...
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post #55 of 73 (permalink) Old 12-22-2018, 04:39 PM
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Jeff, your story made me laugh. That is some good stuff.

Agree Don with the Macdon and the RE calibration.

Again when calibrating the MD FD70, I like to unhook header driveshaft during cal. I also like to fully extend reel to make it "heavier". You can also cal with crop on the header. I also like to cal with the feeder blocked up in the lowered position, to prevent baring down on header. Doing this can result in a very successful calibration with great operating performance. The worst thing on the FD70, or any header, is having the cutterbar float up when raised during calibration. Extending the reel and adding crop weight can help prevent that.
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post #56 of 73 (permalink) Old 12-22-2018, 07:21 PM
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I don't like calibrating because it puts so much down pressure on the head.
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post #57 of 73 (permalink) Old 12-22-2018, 10:18 PM
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Agreed, thats why I used to unhook pto, and better yet, block the feederhouse up from pushing down on header. Blocking the feeder also results in better performance.
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post #58 of 73 (permalink) Old 12-23-2018, 09:19 AM
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I use blocks but With a macdon fd70 at what height do you block the feederhouse , a-b-c-d on the face angle and 1-2-3-4 on the height gauge?
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post #59 of 73 (permalink) Old 12-23-2018, 09:47 AM
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Just put the tilt in mid-range and block the yellow portion of the feeder up when the header adapter has fully collapsed=D You want the header height potentiometers to travel their full range during calibration, but without the combine prying down and away from the header. A good cal will result in a nice, quick, smooth drop rate and good performance while following the ground.

Also, just like the CNH 1020 header, the MacDon cable for height control is barely acceptable for good height control. The cables are so long, and slow to react with age. Sooner or later, the cables fail from dust, moisture, etc. 2011 here and mine have broke twice now. Still broke and I probably won't fix them. Point is, using the Headsight lateral tilt kit eliminated the need for the cables, as the Lexion doesn't use the factory cables and pot for height control. Furthermore, this kit allows lateral tilt on the MacDon.
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post #60 of 73 (permalink) Old 12-23-2018, 10:23 AM
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Seedcleaner do you feel the lateral tilt has helped when cutting on the ground with a fd70?

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