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wjohn 
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Joined: 19 Jan 2010
Location: KS
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 Topic: Gleaner Concave Bar Offset Hole Direction
Posted: 14 May 2025 at 9:52pm |
On the older gleaners with the bolt-in channel style concave bars, does it matter which direction they're installed? The holes are offset to one side.
The concave on the door looks like it only clears some nearby screw heads by flipping it one direction, so I am planning on carrying that over to the other concaves. My CII manual says nothing about it so it must not be important?
Picture of one concave one direction, and the other concave with the holes opposite.
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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DrAllis
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Joined: 12 Sep 2009
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Posted: 14 May 2025 at 9:59pm |
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Short side forward so the channel doesn't get lifted up off the floor.
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tbran
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Posted: Yesterday at 8:30am |
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They look a tad worn... From the factory they had 5 concaves - for hard to thresh crops - we always pulled #2 and #5 out for corn and soybeans. The beauty of the conventional Gleaner - can run 1 2 3 4 or 5 bars depending on degree of threshing needed. CII and M/M2 same cylinder.
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When told "it's not the money,it's the principle", remember, it's always the money..
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wjohn
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Posted: 14 hours 44 minutes ago at 10:04pm |
 DrAllis wrote:
Short side forward so the channel doesn't get lifted up off the floor. |
That logic makes sense. I can't do that with the one on the rock door though due to clearance to the nearby screws (picture below). I will flip the other ones on the concave door the way you describe.
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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DrAllis
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Posted: 14 hours 36 minutes ago at 10:12pm |
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Cut off the concave ends just enough so you can. You do not want to run them backwards
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wjohn
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Posted: 14 hours 27 minutes ago at 10:21pm |
tbran wrote:
They look a tad worn... From the factory they had 5 concaves - for hard to thresh crops - we always pulled #2 and #5 out for corn and soybeans. The beauty of the conventional Gleaner - can run 1 2 3 4 or 5 bars depending on degree of threshing needed. CII and M/M2 same cylinder. |
They are slightly worn. I got a set of 5 new ones from my dealer and mine are down a good 1/16" or so, but the owner/manager said they still had life in them and I should just run them.
They're chewed up in a few spots from rocks too. The owner of the combine before me had concaves 3, 4, and 5 in... Nothing on the rock door, so it probably wasn't kicking open as often as it should and the rest of the concaves took the brunt of it when he was combining soybeans. I'm putting them back in the 1, 3, and 5 positions since a few guys around here have said they don't have issues with wheat left in heads, and then they leave can just use the 1,3, and 5 positioning for soybeans. If it doesn't work out I'll have to install the new set of 5. I assume mixing and matching new/worn concave bars wouldn't be ideal with the varying cylinder clearance.
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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wjohn
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Posted: 14 hours 26 minutes ago at 10:22pm |
DrAllis wrote:
Cut off the concave ends just enough so you can. You do not want to run them backwards |
Interesting and thanks for the insights. I can probably take just enough off of the corner with a grinder to clear the screw heads.
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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tbran
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Posted: 2 hours 23 minutes ago at 10:25am |
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While you are at it would be a good ideal to "0" the cylinder. Run the cylinder down until it touches the concave bars evenly on both sides. Then reset the gages on the left and right to "0" as well. Now you know the true clearance.
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When told "it's not the money,it's the principle", remember, it's always the money..
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