Farm Equipment - D17 Series IV Steering Control Valve Input Seal

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D17 Series IV Steering Control Valve Input Seal

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=212680
Printed Date: 02 Nov 2026 at 12:49pm
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Topic: D17 Series IV Steering Control Valve Input Seal

Posted By: conquest87tsi
Subject: D17 Series IV Steering Control Valve Input Seal
Date Posted: 02 Nov 2026 at 10:13am

I am in the middle of replacing the steering U-joints on my D17 Series IV. In the process, I realized that my primary steering system leak is coming from the Steering Control Valve Input Shaft Seal, item 3 in the diagram below. My manual says to overhaul the steering control valve, the front support needs to be removed. Can I replace this seal without completely overhauling the entire steering valve? The input shaft has "splines" on it that it appears would damage the seal on installation. I'm not sure why this part of the shaft is splined, since the force is transferred through the coupler via the roll pin.

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Replies:

Posted By: Alvin M
Date Posted: 02 Nov 2026 at 10:55am

You can replace the seal with out taking it apart I never saw a splined shaft if it is splined put tape on splines