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IH 684 aux valve low pressure

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Joined: 21 Jun 2021
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PostPosted: Mon Jun 21, 2021 9:38 pm    Post subject: IH 684 aux valve low pressure Reply to specific post Reply with quote

Have a few problems. When i pull the aux valve (one way) lever nothing happens but when i give some rpm to the engine pressure starts to go upwards all the way to 2500 psi (measured from the aux valve) on max engine rpm. Aux pressure is related to engine rpm. I would like to use hydraulic log splitter but its not possible if i have to rev the engine on 2300 rpm!
Second problem is when i move the lever all the way down engine sounds to carry load much more than when the lever is pulled fully up.
So far I have taken apart the unloading/flow control valve and the aux valve but found nothing wrong in there.
Pump is fairly new, oil and filter are new. Steering and 3point hitch works fine.
EDIT: When the aux lever is pulled the 3point hitch makes small upward movement.

This post was edited by Case845XL on 06/21/2021 at 11:11 pm.

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caterpillar guy
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Joined: 24 Jun 2007
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PostPosted: Tue Jun 22, 2021 1:50 am    Post subject: Re: IH 684 aux valve low pressure Reply to specific post Reply with quote

The lever pushed all the way down is a float position. With the lever in the middle position neutral up should pressurize and down just before the detent should do likewise. Now you said you changed the filter. Did you put the tin screen back in and the right way? Also is the system full of crude that it could already be plugged again? If these all are good then you may have a blown gasket in the MCV An o-ring could also be partially squeezed out of place on assembly on it somewhere also. You really need to put it on a flow rater to measure the volume and pressure at the same time. This will give you the health of the pump and valves as well as tell you what pressure the system is doing this at. I believe there is a valve under the tinwork at the front of the seat that may have a bearing on this problem. Can't remember without digging out the book for the 574 which is the same basic tractor just a model older.
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