WD hydraulics loose pressure
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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=144649
Printed Date: 28 Aug 2025 at 12:58am
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Topic: WD hydraulics loose pressure
Posted By: truckerfarmer
Subject: WD hydraulics loose pressure
Date Posted: 21 Nov 2017 at 6:48am
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After about an hour of moving snow it starts to loose pressure and won't lift the loader with a bucket full of snow. It is a trip bucket, and is plumbed to the remote coupler on the back. Using SAE 30 hydraulic fluid. I rebuilt the pump when I put the loader on it. Could use a couple more shims. Builds about 2700 psi. Has small diameter cylinders on the loader. Only thing I can come up with is foaming. If I let it sit for an hour, it will work again. Anybody got any other ideas? ------------- Looking at the past to see the future. '53 WD, '53 WD45, WD snap coupler field cultivator, #53 plow,'53 HD5B dozer Duct tape.... Can't fix stupidity. But will muffle the sound of it! |
Replies:
Posted By: truckerfarmer
Date Posted: 21 Nov 2017 at 7:00am
  Couple pics of tractor and loader. Loader is a New Idea 50?. Tag is messed up so I can't read the last number. ------------- Looking at the past to see the future. '53 WD, '53 WD45, WD snap coupler field cultivator, #53 plow,'53 HD5B dozer Duct tape.... Can't fix stupidity. But will muffle the sound of it! |
Posted By: Allis dave
Date Posted: 21 Nov 2017 at 7:06am
| hmm, hard to say, but at only 2700PSI you could definitely use another shim or two to get to 300-3500PSI. I'd say once the oil gets warm and thins down, you're losing pressure. Maybe it's leaking past an oring or check valve. I can't really think why thinner oil would kick out the relief valve, but maybe so. |
Posted By: truckerfarmer
Date Posted: 22 Nov 2017 at 6:14am
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Actually sae 30 is thick for winter. The WD manual suggests changing to 10 or 20 in the winter depending on temperature. Anybody have any idea what model my loader is. That is not the correct bucket. Also the front of the mount is not original either. It is supposed to have 2 pieces of flat iron hanging down from the frame that a large shaft goes through. The shaft was rusted tight in the tube that it slides through and the ends were bent. I fabricated my own mounts for it. ------------- Looking at the past to see the future. '53 WD, '53 WD45, WD snap coupler field cultivator, #53 plow,'53 HD5B dozer Duct tape.... Can't fix stupidity. But will muffle the sound of it! |
Posted By: truckerfarmer
Date Posted: 22 Nov 2017 at 6:20am
   Here you can see what I did to repair the front mounts. ------------- Looking at the past to see the future. '53 WD, '53 WD45, WD snap coupler field cultivator, #53 plow,'53 HD5B dozer Duct tape.... Can't fix stupidity. But will muffle the sound of it! |
Posted By: Dakota Dave
Date Posted: 22 Nov 2017 at 7:55am
| If you used SAE 30 it's detergent oil it will foam. If it said non detergent than it shouldn't foam. Drain it all out and refill with Hytrans oil. 30 wieght it to heavy for winter use anyway. |
Posted By: Allis dave
Date Posted: 22 Nov 2017 at 8:30am
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30 weight is too heavy for winter, BUT that's not his problem. If it was only an oil weight issues, it would work poorly then get better as the oil warmed and thinned. He has the opposite problem. The hydraulics stop working as everything warms up. Or at least after awhile of use. If you drain and switch oil, make sure all your cylinders are retracted so you'll get all the old oil out of them as well.
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Posted By: truckerfarmer
Date Posted: 23 Nov 2017 at 12:15am
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I'm using SAE 30 non-detergent ISO 68 hydraulic fluid. ------------- Looking at the past to see the future. '53 WD, '53 WD45, WD snap coupler field cultivator, #53 plow,'53 HD5B dozer Duct tape.... Can't fix stupidity. But will muffle the sound of it! |
Posted By: LeonR2013
Date Posted: 23 Nov 2017 at 7:29am
| Well, we've been working on 54 years, and there's one thing I've learned, if it comes down to putting time into your wife or the tractor, put it into the wife if you plan to keep her. You don't have to tell her, she'll notice. If it's to be a farm tractor and used regularly, then it's a tool and not a toy, and she'll be satisfied with that. You guys that have a wife that helps you when you just need that extra hand for a minute, willing to go to a meet with you, able to sit around with a bunch of old wind bags and hear the same old stories every time you have a get together and in general give you support, then you have a keeper and she deserves her share of the time too. Leon |