Case 4230 stuck in 4wd

[Andy Nash]

Hi, this is my first post on here.
I have various IH tractors in differing stages of disrepair, including the above 4230 which will no longer come out of 4wd.
I don't have a workshop manual for this tractor, so was wondering if anyone could give me any pointers on fixing it. So far, I've established that the solenoid is receiving power, and has a resistance of about 10.5 ohms - so I assume that is ok.
Thanks for any replies.

 

[Still Farming]

Solenoid under brake pedal side maybe knackered ?

 

[Andy Nash]

Thanks for that, but I think it must be ok because the solenoid is still getting power, and my understanding is that when it is energised the 4wd should disengage.

 

[Still Farming]

May be other way round as if fails goes into 4wd I think ?

 

[Andy Nash]

Is it not just a switch under the brake pedal?
So that when you brake, the switch breaks the circuit to the 4wd solenoid and 4wd comes in.

 

[sawdust]

Thanks for that, but I think it must be ok because the solenoid is still getting power, and my understanding is that when it is energised the 4wd should disengage.

Even though the solenoid is getting power, the solenoid itself, could still be burnt out!

 

[Andy Nash]

Even though the solenoid is getting power, the solenoid itself, could still be burnt out!

Thanks for that. I'm guessing not because I'm getting a reading when I test for resistance? So the coil is not open circuit, whether it's still faulty or not I have no idea.

 

[Mursal]

So you have enough power to light a good size bulb across the coil?

If so its the coil, if not its a bad connection somewhere.

 

[Andy Nash]

No, not tried that. I put an ohmmeter across the live solenoid wire and it's metal base and got a reading of 10.5 ohms.
I then shorted the terminals across a tractor battery and got a reasonable spark, so I'm assuming the coil can handle current ok.

 

[del_boy]

I remember having a nh 7840 and it would stay in 4wd if a brake light bulb went, might be worth checking your bulbs

 

[Andy Nash]

Thanks, I will try that.
I think it is a mechanical fault though since there is power getting to the solenoid.

 

[Mursal]

How do you know?

 

[Andy Nash]

Ah, I think I know what you mean. I've tested the supply for voltage, but not whether it will produce a current. So, if I connect a biggish bulb across the supply and it lights up the supply must be good.
Electrics are not my thing!

 

[Mursal]

Now you have it .............

 

[REStracTORATION]

Take the solenoid out and clean it it could be sticking if brakes are going etc.
They go to 4wd as default power to hold in 2wd.
I had one last week that was stuck in 4wd the hitch had come slack and flattened the oil supply pipe .
Is it a splitter model test them solenoids for 4 wd.

 

[Andy Nash]

I've cleaned it and going to check the power supply to it tomorrow.
Then I'll look at that oil pipe and see if it's got damaged.
Thanks for the tip off.
Mine has the shuttle gearbox. It lost reverse last year and I got someone to repair it at great expense. Since then the PTO clutch went and now the 4wd. So the 4wd drop box is going to have to come off anyway to gain access to do the pto pack, I thought it might be easier to try and diagnose the fault before I started pulling things to bits.

 

[Mursal]

Feck .........

 

[Richard Devon]

it would be wise to put a gauge in the supply to the MFD and see if you have 320psi before you start pulling it down. It maybe that you have a leak elsewhere in the circuit

 

[Andy Nash]

Quite...

 

[Andy Nash]

Thanks Richard, I have a guage.