FD-75 drops too fast on new to me 750tt - Page 2 - The Combine Forum
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post #11 of 33 (permalink) Old 06-12-2019, 07:53 AM
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One thing that hasn't been mentioned on this forum, is your header height potentiometer working properly on the header? Does the number indicator move smoothly on the header if you manually raise and lower it on the ground? Does the bar graph on CEBIS move smoothly from 50 to 100 and correspond to the header indicator? If not, it could be chaff buildup or a sticky cable on the header possibly.

Accumulators do need to be set fairly close for good performance.

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post #12 of 33 (permalink) Old 06-12-2019, 08:30 AM
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That video shows the head moving WAY to fast to be normal. Much faster than I remember on other Lexions. Typically, on any combine, we tell customers to set manual raise rate to ~4-5 seconds, manual lower rate to 5-6 seconds, auto lower 6-8 seconds. I'd guess you are closer to 2 seconds both ways! No way you will be able to cal that head properly moving at those speeds. That has to shake the whole combine!

I am in agreement with you that bounce is due to the head moving too fast hydraulically, not the sensitivity. I'm actually surprised you were able to stop it by turning down sensitivity. I have my doubts that a leaking seal repair could cause this, unless he caused a problem fixing it.


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post #13 of 33 (permalink) Old 06-12-2019, 08:31 AM Thread Starter
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Originally Posted by seedcleaner View Post
One thing that hasn't been mentioned on this forum, is your header height potentiometer working properly on the header? Does the number indicator move smoothly on the header if you manually raise and lower it on the ground? Does the bar graph on CEBIS move smoothly from 50 to 100 and correspond to the header indicator? If not, it could be chaff buildup or a sticky cable on the header possibly.

Accumulators do need to be set fairly close for good performance.

Yeah sensor seems to be good. I can manually adjust it anywhere on the screen, and when not jumping it stays within +-5 on the left bar gauge. When jumping though the gauge bounces from probably 20 to 100.
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post #14 of 33 (permalink) Old 06-12-2019, 08:32 AM Thread Starter
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That video shows the head moving WAY to fast to be normal. Typically, on any combine, we tell customers to set manual raise rate to ~4-5 seconds, manual lower rate to 5-6 seconds, auto lower 6-8 seconds. I'd guess you are closer to 2 seconds both ways!

I am in agreement with you that bounce is due to the head moving too fast hydraulically, not the sensitivity. I'm actually surprised you were able to stop it by turning down sensitivity. I have my doubts that a leaking seal repair could cause this, unless he caused a problem fixing it.
Thanks Jeff, ill order the fitting i need to be able to charge the accumulators today, and go from there.
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post #15 of 33 (permalink) Old 06-12-2019, 12:36 PM
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That video shows the head moving WAY to fast to be normal. Much faster than I remember on other Lexions. Typically, on any combine, we tell customers to set manual raise rate to ~4-5 seconds, manual lower rate to 5-6 seconds, auto lower 6-8 seconds. I'd guess you are closer to 2 seconds both ways! No way you will be able to cal that head properly moving at those speeds. That has to shake the whole combine!
I’m just confused now.
From the video how can you tell raise/lift rates are too fast? I can't, need full range vid.
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After talking with my dealer tech, we adjusted my top line down to -35 and the bounce was eliminated.
Exactly, raise and lower speeds are almost irrelevant if Cutting Height Adjustment (CHA) is too sensitive.

Really talking two different things here, Jeff’s talking complete range travel times, you are concentrating at cutting height control height position.
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post #16 of 33 (permalink) Old 06-12-2019, 01:06 PM Thread Starter
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Im just confused now.
From the video how can you tell raise/lift rates are too fast? I can't, need full range vid.

Exactly, raise and lower speeds are almost irrelevant if Cutting Height Adjustment (CHA) is too sensitive.

Really talking two different things here, Jeffs talking complete range travel times, you are concentrating at cutting height control height position.
When running on the ground now it seems all right at this setting. But getting there onto the ground is too quick and both manual up and down full ranges are way too fast
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post #17 of 33 (permalink) Old 06-12-2019, 04:38 PM
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Don, I've actually spoken to Jesse about this on the phone, so I probably am basing some of my thoughts off that. Most important is the fact that he can't CHANGE it. Changing the numbers on CEBIS don't change how fast the head drops or raises--in manual or in auto. That is a huge red flag that something is wrong--beyond the head hopping.

Yes, the numbers I gave are for full range; however, I disagree the video is not clear. That head is moving up and down way to quickly, even for just in the height range. Being with Headsight, I look at a lot of "ahhc videos" and to me, its like somebody is running the video at 2x or 3x speed over normal. The only other time I saw something that looked like that was on Gleaner S series machines that had uncontrollable hopping. Sure, turning the sensitivity way down may stop the hop, but it will also make it very non-responsive to changing terrain in the field. Thankfully, the MacDon head may be the most forgiving head out there....

I do hope that checking accumulator pressure may help matters. However, I can't think why incorrect accumulator pressure would make it so you can't adjust the manual raise and lower rates. Very interesting to find out what happens.

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post #18 of 33 (permalink) Old 06-12-2019, 05:52 PM Thread Starter
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Sure, turning the sensitivity way down may stop the hop, but it will also make it very non-responsive to changing terrain in the field. Thankfully, the MacDon head may be the most forgiving head out there....
I picked another couple tank fulls today and noticed that this is already happening. Im picking very slow already at 2.5-2.8mph as its tough and we are baling the straw, but noticed coming over a bridge that its very slow to drop the head on the other side. I have to be under 1.5mph for it to follow the ground correctly.
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post #19 of 33 (permalink) Old 06-12-2019, 06:06 PM
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Jeff I’ve often wondered if Class uses feeder house position in any way for influencing AHHC?
Reason I ask is the best cal I ever did was rather than blocking feeder I pulled feeder faceplate (hydraulically) all the way back, then you have to unplug angle sensor or it will auto center on cal, also have to significantly back float springs as center of gravity shifted back so much. You actually have to tilt MacDon header forward or feeder base will hit ground before header floated all the way up which you have to have.

You end up running closer to center feeder house readings in field conditions.
It’s a lot of farting around to do but it worked well. Need header recognition so all that farting around would be a one time deal!

Last edited by Don Boles; 06-12-2019 at 08:14 PM.
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post #20 of 33 (permalink) Old 06-13-2019, 12:21 PM
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Did I stump ya Jeff?

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