Case CX240B Fault Code !7204

[rjones7211]

2007 Case CX240B.

Machine blew a hydraulic hose right off of the hydraulic pump. Got a new hose and washed everything down to get rid of the oil mess.

Afterwards, the machine started throwing a !7204 code on the display. Power save solenoid disconnected or short. But we continued to run it until the coil pack came in. Changed coil pack, put everything back together and now the machine will not operate. Had a broken wire on the pig tail going to that coil pack. Repaired broken wire.

Machine will start and run no problem, but there is absolutely no hydraulic function on the machine and it still shows the !7204 code.

I really feel like the broken wire shorted out a sensor somewhere but don't know where to start. Have been on phone with case and they've helped troubleshoot a lot of it, but still haven't figured out the problem.

Any help is appreciated!

 

[Kobe Steel]

Try checking that the power save coil pack/solenoid you had replaced is the correct type by part number and check that the faulty one you removed was the power save solenoid and not the lever lock solenoid. Once you have confirmed the power save solenoids location on the manifold , disconnect it and test to see if the hydraulic functions have returned, the 7204 code may still be displayed. If still no hydraulics are working then check fuses and also check that the lever lock solenoid has not blown.

Best regards

 

[rjones7211]

I was told by Case that all 5 of the coil packs on that solenoid valve bank are the same. So they're interchangeable.

So far, the lockout solenoid appears to be working correctly when I check voltage on pigtail coming from the machine.

None of the spools on the valve bank are stuck.

The power save, 2 stage travel, and I think the swing break solenoids all show 28 volts constantly on the red wire on pigtail coming from machine, whether that function is on or off.

 

[Kobe Steel]

If the lockout solenoid is switching on and off then you can go into the service check screen and check that you have pilot pressure at the control valve when a function is activated. If you do not have any pilot pressure then you may need to check the pilot pressure with a hydraulic test gauge. I can send you the sequence step chart to access the service menu screen if you need. The coils are the same but the spools underneath the coil packs are different from one another although these don't appear to be a replaceable item from Case so as long as you haven't swapped any of the spools underneath the coil packs then this should not be the issue. Did you try removing the connector to the power save solenoid and testing to see if any of the hydraulics functions are working?

 

[rjones7211]

Yes, I tried running machine with power save solenoid unhooked. No go.

What is the sequence step chart for accessing the service screen?

Also, would the negative pressure relief valve have anything to do with the hydraulics not working?

I appreciate your help!

 

[Kobe Steel]

Yes , when negative control pressure is high pump displacement/ flow is low so as you move a function the corresponding pump negative control pressure should drop. It is possible that the power save solenoid spool is stuck and not releasing even when the power has been removed. I will send you a copy of the service chart I have for Sumitomo but it should hopefully be the same layout for your Case CX model.

 

[rjones7211]

It seems the spool moves freely when I inspected it. The spring behind the spool is in place as well.

I keep wondering if the broken wire that I repaired on the power save solenoid caused a short on a sensor someplace?

 

[markp2510]

Iam having a very similar problem. Did you finally solve this problem?

 

[rjones7211]

We ended up getting it fixed. We think the power save solenoid spool was stuck which finally allowed the machine to move. We've had that problem on an older 9030B as well. But ultimately, what completely cleared the code and fixed the machine was puting in a new ecm. Price on that wasn't bad but labor was outrageous.

 

[markp2510]

Thanks for the update. Appreciate you getting back to me.