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Farmall & IHC Tractors Discussion Forum
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400 Hydraulic System

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Paul in WI

03-12-2008 13:57:50




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My Hydraulic Pump/system just stoped working. It is full of oil, tractor starts and runs with no noises that are out of the norm.

It has 3 remotes and all have stoped working. Hitch and loader do not move and the motor RPM doesn't change at all when trying to use any of the remotes.

Any ideas where I should start looking and testing? Can a pump just quit working?
thanks!

Paul




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Arlen -MN.

03-12-2008 19:27:45




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 Re: 400 Hydraulic System in reply to Paul in WI, 03-12-2008 13:57:50  
You need to prime your pump. Make sure you have enough oil in the resevoir. Remove a slotted plug on the pump. It has a spring and a steel ball check valve under it. Remove these ( be carefull not to lose them) and pump in oil with a pump oil can. Replace all parts and try it. This has worked for me many times.



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mkirsch

03-13-2008 05:23:54




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 Re: 400 Hydraulic System in reply to Arlen -MN., 03-12-2008 19:27:45  
The pump doesn't just lose prime. Something else would need to be wrong for that to happen.
Either there's an air leak or a restriction in a line somewhere if the pump has lost prime.



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1958johndeere620

03-12-2008 17:27:40




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 Re: 400 Hydraulic System in reply to Paul in WI, 03-12-2008 13:57:50  
Put a gauge on the pump. That would tell you if the problem is the pump or the valves. It is supposed to have 30 to 60 psi with valves in neutral and 12 to 1500 psi at high pressure. It sounds like you have no pressure as you said the motor does not lug when levers moved. The trouble shooting section of my book says
1 Loss of fluid
2 pump failure
3 Faulty pressure regulator valve
4 leakage past lift cylinder seals ( not likley as all of your valves stopped at same time )
5 plugged intake screen

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Red Mist

03-12-2008 17:01:33




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 Re: 400 Hydraulic System in reply to Paul in WI, 03-12-2008 13:57:50  
Be careful until you have diagnosed the problem. You could burn up your pump.
mike



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r4etired

03-12-2008 14:12:12




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 Re: 400 Hydraulic System in reply to Paul in WI, 03-12-2008 13:57:50  
It could quit because the filter collapsed and can't get any oil.



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