No oil pressure on a C
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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=162033
Printed Date: 06 Sep 2025 at 5:59pm
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Topic: No oil pressure on a C
Posted By: Lon(MN)
Subject: No oil pressure on a C
Date Posted: 19 Jun 2019 at 6:35am
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Bought a C. Non-running, just the way I like it. After fixing a few things I got it running but no oil pressure. After a bit was able to prime the pump and got oil pressure. Drove it around and made a few more repairs. (jumps out of third gear). Next day while deciding the fate of this tractor I wanted to move it to a remote corner. Started it and no oil pressure again. What will I find when I get it apart?
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Replies:
Posted By: DougS
Date Posted: 19 Jun 2019 at 6:44am
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Have you checked the oil filter first? |
Posted By: Dave(inMA)
Date Posted: 19 Jun 2019 at 6:57am
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Might be missing the center tube in the filter. If so, that messes with the pressure. ------------- WC, CA, D14, WD45 |
Posted By: Lonn
Date Posted: 19 Jun 2019 at 7:23am
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or could have one of those crappy filters wix made for a short while. ------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
Posted By: Lon(MN)
Date Posted: 19 Jun 2019 at 7:48am
| By no pressure, I meant to say no oil at all coming from the pump. After I primed it, then I had pressure. The next day no oil at all. |
Posted By: CAL(KS)
Date Posted: 19 Jun 2019 at 8:14am
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isnt there a check ball in there? ------------- 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 |
Posted By: Gerald J.
Date Posted: 19 Jun 2019 at 8:53am
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The shop manual could help with details: http://geraldj.networkiowa.com/Trees/Allis-Chalmers-G-B-C-CA-Service.pdf" rel="nofollow - http://geraldj.networkiowa.com/Trees/Allis-Chalmers-G-B-C-CA-Service.pdf Gerald J. |
Posted By: Dick L
Date Posted: 19 Jun 2019 at 11:19am
Think about placing a drinking straw in a glass of liquid then placing a finger over the top of the straw and lifting the straw out of the liquid. You see it retains the liquid but when you remove your finger and the liquid drains out or in the oil pumps case, looses its prime. To loose its prime it has to have air to hold it finger in place to hold the oil from running back down into the oil pan so to speak. A cracked or loose stand pipe will cause it at the bottom end or to much clearance over the pump vane rotor. That can be caused from wear on the cover or a thicker gasket than around .007 under the cover. It could be in some cases the ball check in the stem but it would cause a freer flow thru the stem into the camshaft that could effect the pressure. All of which means at the very least removing the oil pan and then splitting the tractor if it is not found on the bottom side. Other than that is to prime the pump before each start. |
Lon(MN) wrote:Posted By: PaulB
Date Posted: 19 Jun 2019 at 3:54pm
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Rust or a worn spot on the check ball is what I have usually found. ------------- If it was fun to pull in LOW gear, I could have a John Deere. Real pullers don't have speed limits. If you can't make it GO... make it SHINY |