Farm Equipment - D17 Hydraulic lift arm pump

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D17 Hydraulic lift arm pump

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=169042
Printed Date: 19 Jul 2025 at 5:02pm
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Topic: D17 Hydraulic lift arm pump

Posted By: Cob jobber
Subject: D17 Hydraulic lift arm pump
Date Posted: 12 Mar 2020 at 7:14am

Hiya all
My pump relief valve starred knocking last year..and so I thought the hold lever perhaps was not all the way down etc.. (in fact that did correct the problem initially) But since then the pulp continued to do the same thing...now the pump is basically always on..
I've looked over the linkage and had the pump out a time or two..
I've even had the pump apart..and back together. .same thing..always on..
I'm wondering what knowledgeable hands might know about this..
Thank you

Replies:

Posted By: DrAllis
Date Posted: 12 Mar 2020 at 7:18am

Traction Booster linkage under the belly missing or not adjusted properly.

Posted By: MACK
Date Posted: 12 Mar 2020 at 7:24am

Are the lift arms always up? If they are, I would guess traction booster linkage needs adjusted. MACK

Posted By: Cob jobber
Date Posted: 12 Mar 2020 at 7:25am

I wI will mess around with it.. (all the parts for the traction booster are there)

Posted By: DrAllis
Date Posted: 12 Mar 2020 at 7:26am

The Owners manual explains how to adjust that linkage to the proper setting.

Posted By: Cob jobber
Date Posted: 12 Mar 2020 at 7:27am

Yes..the lift arms are always jammed up..
I actually took the pump out last summer..beings that I didn't think it was a great thing having the relief valve screaming all the time

Posted By: MACK
Date Posted: 12 Mar 2020 at 7:51am

If linkage is ok, I would say a spool valve is sticking. MACK

Posted By: Cob jobber
Date Posted: 12 Mar 2020 at 7:44pm

When I had the pump apart..the spool valves had to be tapped out
Notsure the best way to free em up

Posted By: Cob jobber
Date Posted: 12 Mar 2020 at 7:45pm

Perhaps some new o rings

Posted By: Cob jobber
Date Posted: 12 Mar 2020 at 7:46pm

Perhaps some new o rings

Posted By: Cob jobber
Date Posted: 12 Mar 2020 at 7:47pm

Does anyone here have a diagram, they could spare?
I have the book..but it's not too clear

Posted By: MACK
Date Posted: 12 Mar 2020 at 9:22pm

Put spools in drill press or lathe and polish with emery clothe. MACK

Posted By: Cob jobber
Date Posted: 12 Mar 2020 at 10:32pm

Ok..I'lltry that. .lightly of course. .

Posted By: DrAllis
Date Posted: 13 Mar 2020 at 7:24am

Yup. Go ahead and take that pump out one more time !!! You haven't acknowledged properly adjusting the Traction Booster linkage underneath the tractor, which takes all of 5 minutes.