Farm Equipment - F2 rock door concave for corn and beans

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F2 rock door concave for corn and beans

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=197589
Printed Date: 25 Sep 2024 at 1:37am
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Topic: F2 rock door concave for corn and beans

Posted By: Jason n
Subject: F2 rock door concave for corn and beans
Date Posted: 07 Oct 2023 at 5:24pm

Can I let the concave on the rock door of my f2 for corn and soybeans instead of removing it for corn and replacing it for soybeans??? What are any negatives of having it on the door all the time?

Replies:

Posted By: DrAllis
Date Posted: 07 Oct 2023 at 6:50pm

Only way I ever ran an F-series was 1-3-5 which means 1 is on the door for everything.

Posted By: AC7060IL
Date Posted: 07 Oct 2023 at 11:30pm

Which cylinder rasp bars are installed in your F2?
-Standard 1/4” rib spacing?
-Or Aggressive 1/2” rib spacing?

Posted By: Jason n
Date Posted: 08 Oct 2023 at 12:50am

I believe they are the standard rasp bars

Posted By: AC7060IL
Date Posted: 08 Oct 2023 at 7:45am

Standard rasp bar is kind-of its “negative” that you ask about. It can thresh ok. But agressive rasp bars allow far greater capacities.

Anyway, with standard rasp bars try placing a “well worn” (1/2 as tall?) concave in door (#1 position) & leave it for all crops(corn,soy,cereal, etc).
F2 offers 6 concave positions. Like DrAllis says, use 1,3,5.

1,3,5 usually offers best results?
More importantly, what’s your F2’s other settings that you use for its cylinder heights & cylinder speeds per crop??

Posted By: SteveM C/IL
Date Posted: 09 Oct 2023 at 12:42pm

The claim was that bar on door in corn causes extra vibration and wear on latch. Have done both and have no data to support claims either way. Maybe after thousands of acres?

Posted By: Jason n
Date Posted: 10 Oct 2023 at 5:09pm

I'm running 20" pulley as fast as it goes (tach doesn't work) clearance at 1/4" later in afternoon I can slow cylinder down as it starts cracking beans