D12 QUESTION HYD
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=119687
Printed Date: 29 Sep 2025 at 6:49pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: D12 QUESTION HYD
Posted By: tbran
Subject: D12 QUESTION HYD
Date Posted: 29 Feb 2016 at 12:34pm
LATE MODEL SYSTEM - HAS GEAR PUMP
lift arms drift up - can push them down or stop them with
about 100#'s pressure. At idle they do not raise.
Customer did all the things suggested - spool centered, draft
and position backed off,,,
Somehow we have system back pressure entering the passage
going to lift arms... any ideas?
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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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Replies:
Posted By: PaulB
Date Posted: 29 Feb 2016 at 1:48pm
The traction Booster valve is most likely stuck. It's a common problem with these tractors as the adjustment never get changed enough to keep the valve free, the same for the position control valve. Have someone move both lever and another look up from underneath. The valve plunger should follow behind the linkage.
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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Posted By: DiyDave
Date Posted: 29 Feb 2016 at 5:56pm
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My D-12 III has the same problem, its in the linkage, if ya try to adjust the TB, something makes it start acting up, so I just leave the TB alone, when using 3 point equip...
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