• Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

Case TR320 soleniod voltage

Mike AL

Member
Joined
Sep 8, 2013
Messages
18
Location
AL
I have acquired a Case 2012 TR320 that was described as having several hydraulic problems, after some investigation it looks to me like electronic problems. I will just focus on one but adding external power to the solenoids made them all work as they should.
Tilt down is very slow, shows approx 450 psi and stops when contacts the ground. (will not lift front of machine off the ground) When I add an external power source to bring the working voltage to between 6.5 to 8 volts it operates fast and lifts the machine. The working voltage to the solenoids from the UCM that I have checked are in the 5.25 to 5.5 volt range.
This brings me to the question. Is the UCM providing the correct voltage 5 to 5.5 volts or should it be higher? It appears to take at least 6.5V to make things work.
 

Txhayseed

Senior Member
Joined
Dec 23, 2019
Messages
610
Location
Texas
5 to 5.5 volts it’s the normal nominal voltage on Most canbus systems. The days of testing for battery reference voltage at solenoids and controllers and sensors are long gone. I will
Say this from my personal experience case has the worst wiring and routing I’ve dealt with. We used to run a heavy case fleet and I’ve replaced a lot of harness in sr and tr machines. They rub through in several locations. The way they ground the wiring with bolts that pass into the body with silicone globbed on there and that fuse box, what a turd design that is. Not saying your problem is electric but if you suspect that the main problem areas we had was of course the fuse block corrosion on both sides. Where the harness feed into the canopy right you flip the cab and right behind your foot kick panel under where your seat would be closed the main harness ducks under a cover right the before coming back up at crossing under the pumps. Multiple failures at those locations over the years.
 

Mike AL

Member
Joined
Sep 8, 2013
Messages
18
Location
AL
Hey thanks for the reply, I was thinking the UCM was bad but if the voltage is correct I'm not going there yet. I have read about the wiring problems for this model and already repaired 2 broken wires in the joystick.
They showed no damage on the outside jacket, were in a straight area but just broke inside. I have tested some of the wiring from end to end with a meter and so far have not found any trouble except for the joystick
but will keep looking. The service manual covers Pulse width modulation for solenoids, I'm not sure what that is but is that how all of them work or just certain ones? I'm guessing that is built in the UCM?
Anyway I plan on taking it to Case in a few weeks so they can plug into the computer to see if anything stands out but in the mean time I'll keep looking.
Thanks
 

GaryHoff

Senior Member
Joined
Feb 25, 2009
Messages
810
Location
Alberta, Canada
Occupation
Heavey Equipment Mechanic
As Txhayseed mentioned, the harnesses in these machines are prone to issues, but would likely result in a fault code for your control valve circuit. It is however worth looking at the locations he mentioned. Also clean up the ground posts you will see under the cab as well.

There was a series of software updates for these machines. So depending on your software version, you will have some control in your ICU, for parameters that you can adjust.

The UCM will vary the voltage to the solenoids on the loader control valve, to adjust speed and aggressiveness. Your UCM may just be on the lowest setting.

I would try and adjust your settings in your ICU.

All changes must be made with the engine in the off position and the electronics asleep.

1. Before sitting in the seat, press and hold the aux override button (4) and the operate button (3) at the same time for five to seven seconds until SETUP (1) appears in the display. After seeing setup in the display, you may sit in the operator’s seat.

2. Press the start button (2) to scroll between the different menus until EH (1) appears on the display.

3. Press the power button (5) to enter the EH menu.

4. Press the start button (2) to enter the machine function screen (drive, lift, or tilt function).

5. Press the power button (5) to enter the desired machine function speed options (1).

6. Press the start button (2) to scroll to the desired speed level (High, Med-2, Med-1, or Low), then press the power button (5) to save.

7. If no other adjustments are needed, press the aux override button (4) to exit the machine function. If additional adjustments are needed, follow steps five and six.

8. Leave the operator’s seat for five seconds before trying to start the unit.

NOTE: If the machine does not move after step seven, additional electronic reset time is needed. Leave the operator’s seat for one minute.

 
Last edited:

Mike AL

Member
Joined
Sep 8, 2013
Messages
18
Location
AL
GaryHoff I do remember changing all of those settings to high not long after I got the machine but had forgotten about them. So today I changed them all to low to see what would happen and nothing happens.
The settings are saved but everything operates the same no matter what the settings are.
I do show 1 fault code which looks like will have to be cleared by Case: 1207
1207 - Memory Parameters - Invalid Configuration Between IC and UCM
Context:
On EH controlled machines, error code 9403 and/or 1207 displays after updating the earlier instrument cluster software to version 1.3.0.0
Diagnostic Trouble Code 9403 has an error priority of Amber.
There are no restrictions with Diagnostic Trouble Code 9403.

I also monitored PWM signal and voltage to a few of the solenoids, maybe someone will know if these are normal, all freq were the same at 500Hz

------------- bucket extend--------- Bucket retract--------- Arms Raise---------- Arms Lower
Duty Cycle------ 44.5% -------------- 46.6%------------------- 55.5%--------------55.7%
Voltage----------5.23V---------------- 5V------------------------3.8V----------------3.7V
PSI -------------- 450------------------1800---------------------2100----------------Not sure very slow

Bucket retract does not have enough pressure to operate the hydraulic bucket latch unless I add external battery voltage to the retract solenoid, then works very good.
I'm getting a few years on me now and have been waiting for the weather to cool off to work on this thing.
 
Last edited:

GaryHoff

Senior Member
Joined
Feb 25, 2009
Messages
810
Location
Alberta, Canada
Occupation
Heavey Equipment Mechanic
Sounds like the UCM or ICU was improperly programmed. May have miss matched versions of ICM to UCM, or calibrations had failed after programming. I believe you will need the dealer to install new software.
 

CMC76

Active Member
Joined
Mar 16, 2019
Messages
42
Location
Wisconsin
Just got my NH c238 back after having some major wiring surgery. Initially suspected diodes, which indeed were shot. But in addition a bunch of worn wiring. Particularly in the harness in the ceiling. After the repair I probably should have just gone with a brand new harness.
Point of all this, after the repair they got voltage all back in spec and were able to calibrate the controls.
It certainly wasn't free. But good work by triebold implement. And they did a few other things that were above and beyond.
 

Mike AL

Member
Joined
Sep 8, 2013
Messages
18
Location
AL
I got the TR320 back from the dealer a few days ago and looks like my problem had everything to do with the 1207 fault code. (Invalid Configuration Between IC and UCM) The TR320 a track machine was programmed
as a SR160 wheeled machine. Once it was programmed to the correct model all was good. I didn't expect that to be the only problem since it was bought from a Case dealer as a fixer upper. Like I have seen on this site
many times, don't over look the simple things.
Now that it's working like it should I was still curious about the original question of the solenoid voltage. The speed of different functions (raise, lower, tilt) can be set to 1 of 4 choices from low to high. Here's what
I found for the down tilt I'm sure the other functions work the same.

set to low: 4.5V only duty cycle 38% (very slow)
High: tilt starts to move at 4.5V, voltage increases as handle goes to full tilt, at full tilt 6.1 V duty cycle approx 50%
med 2: at full tilt 5.6V duty cycle 46%
So I guess the operating voltage is 4.5 to 6 volts, the higher the voltage the faster it operates, other brands and models may be different.
Thanks for the replies.
 
Top