Farm Equipment - D12 series 2

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D12 series 2 - 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=165093
Printed Date: 07 Apr 2026 at 11:36am
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Topic: D12 series 2 - Hyd.

Posted By: Burl
Subject: D12 series 2 - Hyd.
Date Posted: 16 Oct 2019 at 6:03pm

Hope I can make this clear. Tractor is D12 series 2 - Ser.# 3159 . Has indp. PTO , live hyd. pump with two out ports . One is lift and back one controls Power Booster . The original control valve has been replaced with single two way (Cross brand ) valve. The hyd. lines are in shambles , the way I recieved it. Want to clean up the mess . NOW- can the PB be usable with this set-up ? Looking at manual I dont see how without factory 3 port control valve. If there is a way, please inform me. If that is to crazy , what do I do with the PB pressure line . Can it be plugged ? It produces pressure full time . Got the bright idea to take out idler gear but it wont pick up prime.
This subject had been brought up before but I did not see remedy . Any body know what can be done ? Thanks

Replies:

Posted By: Charlie175
Date Posted: 17 Oct 2019 at 5:40am

Traction Booster I think you mean?

Do you need this feature? Do you still have the control rods that operate the traction booster valve?

The factory control valves tend to leak over time and once pitted on the inside, won't seal. People replace it with an off the shelf unit to maintain 3 point lift use but lose the TB feature.

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Charlie

'48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD

Posted By: Burl
Date Posted: 17 Oct 2019 at 7:37am

Yes , TB, not PB .Dont know where I got that. I am sure the old valves went bad and were replaced . I removed all the TB parts. Only thing to delete is pressure line from pump . Prev. owner ran TB line to front port on lift valve which really just pluged it off. I quess that this is an OPEN hyd. system. I think this is bad. How do I dump this pressure? Thanks