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AC 190 hydraulic issues |
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Allis Eli ![]() Bronze Level ![]() Joined: 17 Apr 2024 Location: MN Points: 27 |
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Hi everyone just joined the forum. Looking for some advice on my Allis Chalmers 190 with low hydraulic pressure
when bought the tractor it had been sitting for 5 years. It has 3900 hours gas engine. I just got it running and now it runs and drives good. however the hydraulic linkage was stuck so I freed that up. I tried to lift a 5x6 round bale on the three point and it would not lift. it did not even pull the engine down so I changed the hydraulic filter and filled oil. power steering works and so does the power director. I already pulled both the relief valves on the valve stack they were clean so I reinstalled both of them. still won't lift bale. if I understand correctly the front relief valve is for the traction boost and the back one is three point? so does the relief vale need new seals or swap or something. or is the pump possibly going out. thanks |
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DrAllis ![]() Orange Level Access ![]() Joined: 12 Sep 2009 Points: 19714 |
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Swap the two relief valve positions and try it. If you now have hydraulics, the one in the Traction Booster location needs a seal kit or replace with new.
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Lynn Marshall ![]() Orange Level Access ![]() ![]() Joined: 13 Sep 2009 Location: Dana, Iowa Points: 2162 |
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The relief valves are adjustable. A quality gauge plugged into one of the remote outlets will tell you what you have now and later, after you have adjusted it. 2300 psi is approximately what you want. Half a turn at a time with the screw. You don't want to overdo it.
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Allis Eli ![]() Bronze Level ![]() Joined: 17 Apr 2024 Location: MN Points: 27 |
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okay thanks for the reply's. I will switch the relief valves I don't have a hydraulic gauge where would you recommend for getting one.
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AC720Man ![]() Orange Level ![]() ![]() Joined: 10 Oct 2016 Location: Shenandoah, Va Points: 4750 |
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Don't forget to check the sump screen under the tractor. When I bought mine is was really dirty and obviously had not been cleaned for a long time. After cleaning it and swapping valves, although it helped, the pump was in dire need of a rebuild. Sent it to SLI for a rebuild and luckily they was able to rebuild it. Now it works great. My good friend just had to purchase a new pump for his series 1 as his could not be rebuilt. $2,800, I hope a valve swap fixes your issue. Rebuilt his valve since it kept sticking but unfortunately the pump was the issue.
Edited by AC720Man - 17 Apr 2024 at 10:24pm |
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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DrAllis ![]() Orange Level Access ![]() Joined: 12 Sep 2009 Points: 19714 |
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Get yourself a 3,000 psi gauge and attach a hydraulic tip onto it. Plug it in a remote outlet and activate that remote lever with engine throttled up to 2,000 RPM or more. Traction Booster relief valve is 2100 psi and main relief is 22-2300 psi max.
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Allis Eli ![]() Bronze Level ![]() Joined: 17 Apr 2024 Location: MN Points: 27 |
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hey everyone here is a quick update on the 190. I took out both relief valves and opened them to inspect the orings. on both of them they were completely worn out and cracked. where would you recommend getting new ones. I did find part number (70276323) are these the right seals? also 100 bucks seems like a awful lot for some orings and other parts anyone have any good sources to get these cheaper? thanks for everything
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AC720Man ![]() Orange Level ![]() ![]() Joined: 10 Oct 2016 Location: Shenandoah, Va Points: 4750 |
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I remember those being really expensive when we rebuilt Mutts, I mean crazy expensive from AGCO. The parts book or an AGCO dealer can verify the part number.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Allis Eli ![]() Bronze Level ![]() Joined: 17 Apr 2024 Location: MN Points: 27 |
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okay thanks
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SteveM C/IL ![]() Orange Level Access ![]() Joined: 12 Sep 2009 Location: Shelbyville IL Points: 8073 |
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It will be money well spent. It gives your tractor back. A year from now you'll not know it.
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ksbowman ![]() Silver Level ![]() Joined: 19 Mar 2013 Location: Paola, Ks Points: 227 |
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When I rebuilt the relief valves on my 180 I just used the ones out of my O-ring kit. That was about a year ago and it is still working great.
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Allis Eli ![]() Bronze Level ![]() Joined: 17 Apr 2024 Location: MN Points: 27 |
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so your saying that you just bought some cheap orings that were close to the right size? I have a lot of good orings I am just not sure if they are hydraulic rated or whatever. thanks
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DrAllis ![]() Orange Level Access ![]() Joined: 12 Sep 2009 Points: 19714 |
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There is at least ONE split back-up ring and you aren't going to kind that very easy. They are not "cheap" quality Orings.
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Allis Eli ![]() Bronze Level ![]() Joined: 17 Apr 2024 Location: MN Points: 27 |
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okay so you would recommend just biting the bullet and getting the 100$ set from Agco
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DrAllis ![]() Orange Level Access ![]() Joined: 12 Sep 2009 Points: 19714 |
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I don't like their prices either, but how much screwing around does one want to do to try and duplicate the correct parts ???
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Allis Eli ![]() Bronze Level ![]() Joined: 17 Apr 2024 Location: MN Points: 27 |
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okay sounds good I will order the good ones
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DrAllis ![]() Orange Level Access ![]() Joined: 12 Sep 2009 Points: 19714 |
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As with ANY relief valve rebuilding, I never change the adjustment screw from where it was unless pressure testing reveals otherwise. Ease a remote lever (with 3000 psi gauge plugged in) into engagement SLOWLY ( at 2,000 RPM) to see what you have and do NOT exceed 2200-2300 psi or you will explode the hydraulic pump.
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ac fleet ![]() Orange Level ![]() Joined: 12 Jan 2014 Location: Arrowsmith, ILL Points: 2238 |
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Might pay to get the right stuff and not have to do the job over again with possible more damage the next time! I just paid $75. at IH for a z-turn mower ignition switch that should have been $20 tops, BUT at least it works so I guess the dealers gotta have somebody pay for their fancy stores! The choice is yours!
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http://machinebuildersnetwork.com/
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EPALLIS ![]() Orange Level ![]() Joined: 12 Sep 2009 Location: Illinois Points: 1118 |
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I think most on here have "their issues with AGCO". However, at the end of the day and when all is said and done, I am so grateful they are still here and servicing 60 year old tractors. Not all companies would do that. Good luck and hope the repair goes well!
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Allis Eli ![]() Bronze Level ![]() Joined: 17 Apr 2024 Location: MN Points: 27 |
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hey everyone I did some more research on the hydraulic relief valves for my 190 and found that A&W tractor has a brand new relief valve for 115$ or I could just spend 100$ on seals. would you guys by the whole relief valve or just the seals. I feel like it would be much easier just to install the new relief valves them taker the old ones apart and install new seals. thanks
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Allis Eli ![]() Bronze Level ![]() Joined: 17 Apr 2024 Location: MN Points: 27 |
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hey everyone today I hooked up a three point tiller to my 190. I lifted it fine its a larger one 400-500lbs. It still won't lift a round bale. do you think the relief valve is maybe just out of adjustment? if it is how would I adjust it. I am assuming I would get a 3,000 psi gauge and put it on the remotes and them turn the screw in for more psi and out for less?
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DrAllis ![]() Orange Level Access ![]() Joined: 12 Sep 2009 Points: 19714 |
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Relief valve must be set for 2,200 to 2,300 PSI. Top link for the three point hitch should be in the TOP hole on a factory three point hitch.
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Allis Eli ![]() Bronze Level ![]() Joined: 17 Apr 2024 Location: MN Points: 27 |
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thanks Dr Allis
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DrAllis ![]() Orange Level Access ![]() Joined: 12 Sep 2009 Points: 19714 |
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Failure to be able to adjust the main relief valve to the proper pressure with the engine at 2,000 RPM would indicate the hydraulic pump lift section has a problem.
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Allis Eli ![]() Bronze Level ![]() Joined: 17 Apr 2024 Location: MN Points: 27 |
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hey all. I decided to bite the bullet and order a new relief valve from A&W tractor. which relief valve do I need to take and and put in the new one. is it the Relief valve on the back of the valve stack or front? thanks
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DrAllis ![]() Orange Level Access ![]() Joined: 12 Sep 2009 Points: 19714 |
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Rear cartridge is the main relief valve.
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Allis Eli ![]() Bronze Level ![]() Joined: 17 Apr 2024 Location: MN Points: 27 |
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thanks Dr allis. also the new relief valve is supposed to be pre set at 2000 psi. I assume I would still want to back the screw out and pressure test it then and add pressure little by little?
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DrAllis ![]() Orange Level Access ![]() Joined: 12 Sep 2009 Points: 19714 |
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No. If it is supposed to be set at 2,000, it should be at 2,000. CAREFULLY and GENTLY ease into your remote lever with a 3,000 psi gauge and do NOT exceed 2300 psi. In fact, the truth of the matter is this......if 2,000 psi system pressure will lift the heaviest item you have, the hydraulic pump will last longer at 2,000 psi than it will at 2,300 psi.
Edited by DrAllis - 25 Apr 2024 at 2:20pm |
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GSTROM99 ![]() Silver Level ![]() ![]() Joined: 12 Dec 2020 Location: Greene, IA Points: 231 |
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You can't guess what the pressure is. Like voltage, you need to measure it. 3k psi gauges are available almost everywhere. Amzn is a good source. I ordered a 5k psi gauge (for my D-17 hyd issue) from my local NAPA (I like to shop local whenever I can). The fittings were the challenge.
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Allis Eli ![]() Bronze Level ![]() Joined: 17 Apr 2024 Location: MN Points: 27 |
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I got a good gauge 5k psi gauge plugged into the remotes. so I will just install it and test carefully from there
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