Hydraulic Valve Question D Roadgrader
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=153697
Printed Date: 25 Aug 2025 at 8:22am
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Topic: Hydraulic Valve Question D Roadgrader
Posted By: D-Patrol
Subject: Hydraulic Valve Question D Roadgrader
Date Posted: 05 Sep 2018 at 1:43pm
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All Concerned! I finally got my ring and pinion repaired and am back in business, except for one little problem. The Hydraulic Valve which controls the left bank of three levers is leaking where the plunger or spool goes into the control mechanizum (SP). I called the local hydraulic shop and they want to know the (1) Gallons Per Minute flow rate, (2) Open or Closed System, (3) the PSI?
Can you help me? Need advice and information!
Thank you so much....!
Michael Clites
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Replies:
Posted By: CAL(KS)
Date Posted: 05 Sep 2018 at 2:08pm
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I would guess an open center system but i dont own one. graders prior to serial # 5378 used a hydreco valve and graders #5378 and up use a husco valve. the valves should have tags on them you can give the numbers to your shop. i have serious doubts its more than 30 gpm but i cant say for sure. GPM and pressure should be listed in a service or operators manaul. you say left bank that sounds like the auxiliary valve
parts book http://files.minnpar.com/partbooks/MOTOR%20GRADER%20MANUALS/ALLIS%20CHALMERS%20MOTOR%20GRADER%20MANUALS/D%20PM%20%2370667884.PDF" rel="nofollow - http://files.minnpar.com/partbooks/MOTOR%20GRADER%20MANUALS/ALLIS%20CHALMERS%20MOTOR%20GRADER%20MANUALS/D%20PM%20%2370667884.PDF
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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20
Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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Posted By: D-Patrol
Date Posted: 05 Sep 2018 at 3:01pm
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Hi, Thank you for your response. I had one fellow on the phone tell me, he thought the flow would be 8-10 gallons per minute, the PSI would be 2200 and that the system would be open. I have a parts manual but not the owners/operators manual. Can you tell me where I can get an owners manual. I am also seeking a creeper tranny attachment, a power steering unit, and a cab. Do you know where I can get an owners manual. Mike
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Posted By: im4racin
Date Posted: 05 Sep 2018 at 3:35pm
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hold on!!! if you have the early sn you just need a seal from napa. mine were leaking and I got a seal from them and fixed it. I can get that number if you need it. as for the creeper....good luck. try wellers at 1-800-255-9325. they have been very good at helping me with parts
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Posted By: D-Patrol
Date Posted: 06 Sep 2018 at 12:29pm
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Yes Please!! That would be great. If you send me an email address, I can send you pictures of my to IOT determine if it’s the same. My email is michaelkclites@hotmail.com. I am in Carthage SD. I ran across a chap in Nebraska who had a cab, but I can’t find his email anymore.
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