JD 6330 lost drive

[young bull]

Our 6330 has lost drive it’s come up with the error code EPC524230.03 which reads as proportional solenoid valve for transmission enable stuck in open position. At first I thought there would be a relay gone wrong somewhere but can’t seem to find one relating to the transmission. I then tried to turning the come home relay which shows as active on the screen but the tractor still does not drive so I’m thinking that rules out an electrical fault?

I then took the valve out the bottom of the transmission, there appeared to be some oil running down the electrical connector, I then cleaned it with paraffin, I did notice there seemed to be an O ring missing at the top of the valve so have replaced this but has made no difference. Is there anything else I should check before I order a new valve?

Thanks

 

[Tractortech]

Now Then..
How many hours has it done?? If oil is present in the connector, usually that's a sign of failure.
There is no O-Ring fitted to the top groove, so you don't need it..

 

[mtx.jag]

@Phil P

 

[young bull]

Now Then..
How many hours has it done?? If oil is present in the connector, usually that's a sign of failure.
There is no O-Ring fitted to the top groove, so you don't need it..

About 3250 hours it’s sounding like a new valve then?

Thanks

 

[Phil P]

The code is saying the enable valve is stuck open. The transmission controller establishes the this by looking at enable pressure using the enable pressure sensor on the front of the transmission. First thing to do is see if there is actually pressure at the sensor or if it’s giving a false reading (faulty sensor). I’d stick a gauge on and see whether it actually valve fault or a sensor fault.

 

[young bull]

The code is saying the enable valve is stuck open. The transmission controller establishes the this by looking at enable pressure using the enable pressure sensor on the front of the transmission. First thing to do is see if there is actually pressure at the sensor or if it’s giving a false reading (faulty sensor). I’d stick a gauge on and see whether it actually valve fault or a sensor fault.

Thank you, I’ve ordered a pressure testing kit, what pressure should I be looking for to see if the sensor is working? Or is it a case of if there is pressure the sensor is working if there isn’t any pressure the sensor is faulty?

Thanks

 

[Phil P]

Thank you, I’ve ordered a pressure testing kit, what pressure should I be looking for to see if the sensor is working? Or is it a case of if there is pressure the sensor is working if there isn’t any pressure the sensor is faulty?

Thanks

With the F/R level in N you shouldn’t have any enable pressure, if there’s pressure there the valve must be open.
I can’t remember if it’s either address 11,12 or 13 in the EPC that displays enable pressure that the sensor is seeing (it’s been a while now since I’ve looked at one!) but it should be zero in neutral and around 12-14 bar with a direction selected.

 

[young bull]

With the F/R level in N you shouldn’t have any enable pressure, if there’s pressure there the valve must be open.
I can’t remember if it’s either address 11,12 or 13 in the EPC that displays enable pressure that the sensor is seeing (it’s been a while now since I’ve looked at one!) but it should be zero in neutral and around 12-14 bar with a direction selected.

Ah thank you that is really helpful, I’ve just looked now and I can’t see 11,12 or 13 but there is 14, could this be the one you’re thinking of? If so it’s showing 0 with the F/R in all three positions? Is this indicating a faulty sensor?

Thanks again

 

[young bull]

Just had another look and if I put revs to 1500 it is showing roundabout 28 in address 14 with it in forwards or reverse, when put back into neutral this figure drops a couple but doesn’t seem to go back to 0 unless I knock the revs off. Therefore the valve must be stuck open as per your post?

 

[SteveO]

Does the O ring need to be there on any tractor ? Can it be that on DirectDrive it does have that O ring ? I have seen them with and without it on valves.

 

[Phil P]

Just had another look and if I put revs to 1500 it is showing roundabout 28 in address 14 with it in forwards or reverse, when put back into neutral this figure drops a couple but doesn’t seem to go back to 0 unless I knock the revs off. Therefore the valve must be stuck open as per your post?

Need to be in technician mode to get the other addresses, can’t remember what 14 is to be honest but it could be pressure.

 

[Tractortech]

EPC 013 is the enable pressure sensor in volts & Kpa.
EPC 014 is the transmission speed sensor, displayed as RPM.
EPC 013 is only visible in 'technician mode'.
With the ignition on, there should be 0.5 - 0.55 volts, displayed as 0050XXXX.
With the engine running and the range lever in Neutral, FNR in N you should have XXXX0000. With the FNR in F or R it should read XXXX1400 or thereabouts. It should decrease to XXXX0000 as you press the clutch pedal.
You don't really need the pressure gauge..