51 CA hydros won’t lower???
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=185833
Printed Date: 22 May 2025 at 5:32pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 51 CA hydros won’t lower???
Posted By: bigredneck61088
Subject: 51 CA hydros won’t lower???
Date Posted: 17 Jan 2022 at 12:17am
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My 1951 CA has always worked flawlessly in the hydro dept since I’ve had it from my grandpa. The lift arm hydros, cylinders were rebuilt two years ago just because they leaked bad and other than some leaky axle seals never had an issue… tractor has a snap coupler converted blade for snow and driveway I was plowing tonight and noticed the lowering position when i threw the lever was getting lower to the floor board to drop the blade, I was able to finish but by the time I parked it the cylinders will not lower…. Even with the heavy blade hanging they won’t go down, I tried changing pump settings and no luck… I will check it in the morning and see if they have dropped any Where do I start to troubleshoot? Traction boost? Linkage?? Pump and hydros have worked flawlessly until today, never had an issue lifts and lowers great, I checked the linkage and nothing seems out of whack, I don’t know a lot about hydraulics in general and the manual is not great for troubleshooting this but I rebuilt the whole engine on this tractor and am mechanically inclined I wouldn’t think it’s the pump itself as it lifts and works fine and the drop on these things is basically the implement weight? any guidance??? Like I said I have never had a problem until today with it . I did drain the trans/hydros while it was warm and I am gonna put new in tomorrow maybe flushing some crap out? |
Replies:
Posted By: steve(ill)
Date Posted: 17 Jan 2022 at 1:18pm
Brandon, i dont know much about the CA, but have worked on many B models ( different pump).. The description you have of getting "more slop" in the handle and moving further, then stopping all together... i have seen on the external linkage with plates STUCK ( item 33- 35) , ball or spring broken or missing ( 36- 37) , etc..Sometimes just spraying penetrant on 33-35 could free things up... Cleaning out the oil is a good plan... But "change over a short period of time" could be some wear in the external linkage.. look at drawing below..... im assuming you dont have water froze in the valve body. ------------- Like them all, but love the "B"s. |
Posted By: bigredneck61088
Date Posted: 17 Jan 2022 at 4:05pm
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I went out today and they didn’t drift down still stuck up… with the converted snap coupler blade hanging. None of the linkage looked out of whack and nothing froze that I could see. It all externally looks as it did when it was working Didn’t have enough time to do anything else, used the quad to do the drive today I have it set in the hold mode, should I try switching to the other modes to see if it works that way? |
Posted By: ACCA52
Date Posted: 17 Jan 2022 at 6:07pm
| Check under tractor to see if bunch of snow/ice is interfering with the traction booster, or lock out the traction boost with the knob |
Posted By: bigredneck61088
Date Posted: 18 Jan 2022 at 12:19am
| I don’t know a lot about the traction boost, just because it’s always worked, I’ll check it for ice tomorrow wasn’t bad when I parked it but I didn’t look close, but how do I lock it out with the knob??? |
Posted By: ACCA52
Date Posted: 18 Jan 2022 at 10:43am
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Posted By: bigredneck61088
Date Posted: 18 Jan 2022 at 9:19pm
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Ran it a bunch today and monkeyed with it…. I let it run a while to warm up the case, checked traction boost and un pinned it working it manually with pliers and it tried to raise. All linkages and all seem to be set right. I un pinned the plates and they weren’t froze and separated. After a while running I could bump it up and it would creep down a few inches and slow, hydros work real fast up now. I pulled it into the heated garage and gonna let it sit overnight, I was able to monkey it and get it to drop after shutting it off but I was bumping the lever back and forth and I was in the almost up position… but the lever is real funky like something is stuck or froze inside, we will see what a night of warmth does. After it froze up I drained and I refilled all the trans fluid today before running it so if it did have water it should have flushed some… could something be froze up in there? I was running standard universal trans fluid with a little Lucas hydro fix to slow the axle seal leaks and everything worked fine prior to the other day Should I plan on taking apart the hold valve? Is that something that could have an issue…. Pump has good up pressure so I’m not sure what to get into next |
Posted By: bigredneck61088
Date Posted: 14 May 2022 at 6:30am
| In case anyone wanted an update, took the pump and hold valve to sandy lake, they rebuilt both and several springs and other parts broken, back on the tractor and working fine! Thanks for all the help gents |
Posted By: DaveSB
Date Posted: 14 May 2022 at 5:14pm
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Glad you got it fixed. ------------- 1948 C, 1953 CA, 1948 WD, 1961 D-17 Series 2 Diesel, 1939 WC, 1957 D14 |