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Farmall & IHC Tractors Discussion Forum
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674 hydraulic relief valve

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ian Davies

03-01-2005 22:34:16




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My front end loader will only lift 1000 pound I am suspecting its the relief valve after changing the hydraulic filter and no improvement. But where is the relief valve located i suspect it is in the MCV where the filter is but which part of it my manual doesnt show it? Any knowlagable help appreciated




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Bernard le mécano

03-02-2005 09:58:30




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 Re: 674 hydraulic relief valve in reply to ian Davies, 03-01-2005 22:34:16  
Hi, the relief valve is located under the MCV, it have 2 plug, the thin one is the relief valve. The large is the priority valve that allow 3 gpm to the steering and 9 to the hitch and remote, for a 574. Have you check for the high pressure test, check on remote and loader coupler. About +- 2500 psi at 1500 rpm, if not may be the trouble is the pump. Bernard le mécano Québec Canada



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Ian Davies

03-02-2005 18:26:07




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 Re: 674 hydraulic relief valve in reply to Bernard le mécano, 03-02-2005 09:58:30  
Thanks Bernard you are always very knowladgable I have replaced the remote have not done a high pressure test, i will put a washer or 2 under the relief valve that should give me more pressure hopefully not to much to split the pump housing.



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