D21 hydraulic flow control
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=197858
Printed Date: 25 Sep 2024 at 1:31am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: D21 hydraulic flow control
Posted By: 55allis
Subject: D21 hydraulic flow control
Date Posted: 24 Oct 2023 at 2:14pm
Hi a’ll!!
So this may be a silly question but here it goes, so when i pick up an implement with it it takes too long so I’m wondering how to adjust it so it goes faster?
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1955 AC WD45 diesel with D262 repower, 1949 AC WD45
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Replies:
Posted By: DrAllis
Date Posted: 24 Oct 2023 at 6:32pm
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No tractor manufacturer offered such a thing until the early 1970's, like a 7030/50 Allis or 4430/4630 Deere. A healthy D-21 hydraulic system should have 16.5 GPM oil flow at 2,000 psi at the remote outlets with the engine running 2,200 RPM's. If it is slow, you either have a weak pump lift section, a low PSI main relief valve, too large of diameter cylinder(s) you are trying to lift or the wrong couplers/hose tips on the back of the tractor. By comparison, a D-17 IV, 170-175-180-185-190-190XT-200 has 12 GPM at the rear outlets.
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Posted By: 55allis
Date Posted: 24 Oct 2023 at 6:42pm
We hooked it on a 20’ deere disk and it has to be about half throttle to make it go up…
I’m not sure what would be normal but I want to make sure everything right.
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1955 AC WD45 diesel with D262 repower, 1949 AC WD45
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Posted By: DougG
Date Posted: 24 Oct 2023 at 6:50pm
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Seems right- open her up ! That 426 sounds nice wide open! Thats how they work the best, and hydraulics should be faster,
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Posted By: DrAllis
Date Posted: 24 Oct 2023 at 7:25pm
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Funny you should mention a Deere disc. Last time I had a serious tractor hydraulic complaint, the 7020 tractor was hooked to a Deere disc. Customer complained the hydraulics on his new 7020 weren't up to the task. His old One-Seventy loader tractor was better. I called his bluff. Made him back the old tractor over and hook up to the disc. It wouldn't raise it any higher than the 7020 did. I then greased the saddles on the discs axle tubes and then both tractors would lift the disc all the way up just fine.
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Posted By: 55allis
Date Posted: 24 Oct 2023 at 11:04pm
I thought about that…
Also had it on a Deere field cultivator, did the same thing (both was greased up).
We have it on an auger right now and it slow with that too…
I have a tester that may give us an idea of how much pressure…
But I’m not sure how to test the gpms….
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1955 AC WD45 diesel with D262 repower, 1949 AC WD45
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Posted By: DrAllis
Date Posted: 25 Oct 2023 at 2:01am
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Are you absitively 100% positive you have proper and compatible hydraulic couplers and tips on the back end of the tractor ?? Also, I believe on the D-21 the two left outlets go to the left remote lever. The center two hoses go to the right remote lever.
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Posted By: DrAllis
Date Posted: 25 Oct 2023 at 2:14am
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Thinking about this, with the engine running at 1,100 RPM there should be 8.25 GPM out a remote coupler. I'd expect one 3"diameter x 8" stroke hyd cylinder to raise an implement in 3 seconds.
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Posted By: 55allis
Date Posted: 25 Oct 2023 at 8:01am
When I get it back I will confirm that everything is right and do some testing…
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1955 AC WD45 diesel with D262 repower, 1949 AC WD45
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