Farm Equipment - D Grader Power Steering

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D Grader Power Steering

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=211260
Printed Date: 17 Sep 2026 at 2:11pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: D Grader Power Steering

Posted By: Pgriswd
Subject: D Grader Power Steering
Date Posted: 03 Jun 2026 at 1:43pm

Hello all,

I am putting a Char-Lynn torque generator on a D grader. I was thinking tapping in the existing hydraulic system and would the system have enough pressure/flow for the added load?

Thanks.

Replies:

Posted By: DrAllis
Date Posted: 03 Jun 2026 at 5:07pm

Those old systems needed 3 GPM to work. I'm thinking 1200 to 1500 psi. You'll need what they call (back in the day) a priority valve or a flow divider valve. The hyd pump sends 100% of its oil to it first. It then sends the first 3 GPM (adjustable flow) to the power steering system out the priority port. The remainder of whatever flow the pump can deliver then goes out the secondary flow port to your machine/implement valves.

Posted By: Pgriswd
Date Posted: 03 Jun 2026 at 7:34pm

Great and thanks Dr. Allis. I will look into a “priority” valve.