Case 621D no movement

Hello everyone. One day when I tried to start machine batteries were weak so I replaced them. Once I got it started, I noticed I no longer had any N in the transmission indicator there was also a brake light (in instrument cluster) that would stay on for a long period. No matter what I did the parking brake switch would aways stay lit as if the parking brake never releases. Prior to this, I would start machine and unit would beep at me and brake light would not go out. Then it would make a loud buzzing noise Cycling the key, it still beeped for a while then eventually shut off. I am thinking it may be an issue with the brake pressure switch. I see two switches on a unit below the brake pedal.where front and rear brake lines seem to end up. Does any one know that the 621d (with low to no brake pressure) would have some fail safe to not allow it to move? I am also wondering which of those two switches would be the one likely causing this problem, what each is for and how to tell difference between the two.
Thanks

The brake valve under the cab could be the issue. Check the pressure switches there and the accumulators under cab for brake operation. If the accumulator is low the pressure will not build and park brake will not release or transmission engage.

Thanks Coy for information, I proceeded with information you gave me and used diagnostic information as per the manuel by scrolling through the instrument cluster using the program/reset and up down switches to check the brake switches.
display location number 17 (brake pressure switch status) showed a 01 which stated open which was normal pressure
display location number 44 (redundant brake pressure switch) 00 which is switch closed which is also normal
Seems like under the cab there is a hydraulic control unit that has two swithes on it one looks like it is in the line for the front brakes and other for the rear. I am guessing these are the brake and redundant brake switches (want to make sure I am correct). Finally I went to
display location number 45 was able to check service brake foot switch it cylced from 00 to 01 as I pressed on the brakes. I also saw in display location number 031 that if there was a TECM shutdown there would be 400 displayed, but mine stays at 000 (shift not in process) no matter what gear I put it in. I am assuming this means all swithes are working properly for the brakes.
So I did a little more reading and found out fault codes start at positions 71 and run up to poistion 90. There were several codes one at about 27 hrs ago 47000 CAN interface failure where no signals received over one second of time and 1 hr later 46229 which is an error at communication on CAN .
Since the code 47000 came up 1st,went though possiilbe steps for repair: clear codes, restart machien and monitior it. I proceeded to do that, (there were 4 other faults that also cleared) but it seems like this is a hard failure and I can not find any more information on it.. Is this CAN controller in the cluster? Any advice on where I may or where to look for more information?

I believe the 47000 code deals with the transmission auto adjustment. The 46229 I'm not sure what it is but if you have the service manual there should be a fault code list and explanation in there.

Still have not got problem fixed, but I do believe the transmission ECU is the issue. I got to plug one in from another loader (different brand but same zf transmission) and now I have transmission notifications showing up in dash again. Parking brake does not release now and I have a few codes. should i check pressure with a gauge at the brake valve or is going though the program mode on the dash in position 17 (brake pressure switch status) good enough. What else could cause the parking brake not to release? Is there way to by pass it? Does any one know where I can get a used one or possibly this one repaired? Part number is 87427310
thanks

Just a few things before you condemn a transmission controller.

In my experience, the transmission controllers rarely fail. However, I have seen instrument cluster failures.

Might seem like a basic step, but please check all of your fuses. Remove them all and check for corrosion.

In regards to the brake pressure sensors, you can just jump them with some wire to trick the controller. The 2 that are the same are normally open, close at 900psi. The third is normally closed. Opens at 1700psi. Fourth one is for brake lights. You should be able to trick the cluster if brake switches are your issue. You can check this in the monitor on brake pressure switch status.

Make sure your brake lights work. Early machines were wired funny, and a damaged or burnt brake light can cause issues.

Are there any active fault codes right now?

I do have some codes and so everybody else can see what we talked about here is what you shared with me.


the 1st two codes are on the original module
47000 CAN interface failure
46229 Error at communication at CAN


these are codes on new module
46021 logical error at FNR switch
46058 short circuit to battery voltage or open circuit at output speed sensor
46150 not listed in service manual
46246 Clutch adjustment data lost
....
It would appear that the different software may be the cause of several codes. It would also appear that the TCM from your Doosan is coming online, while the Case TCM is not coming online.
So i will check the following as you suggested..

"Locate the 9 pin deutsch diagnostic connector in the cab.

With the Doosan TCM installed:
With the key off, measure resistance from pin C to pin D
With the key on, measure voltage from pin A to pin C
With the key on, measure voltage from pin A to pin D


With the Case TCM installed:
With the key off, measure resistance from pin C to pin D
With the key on, measure voltage from pin A to pin C
With the key on, measure voltage from pin A to pin D"

I willl try this weekend then I will let you know my results.

If it was just a software mismatch, are you aware of anyone that can get ora way to load the right software on the other unit or am I just better off getting one from another case unit.. I have located a few of them but they are twice the money.

Some of the other things I retested tested
went to display location 017, brake pressure switch status had an 01 for status manual says this is normal
went to display location 043, parking brake switch status seemed to switch from 00 to 01 when toggling switch so it seems to work;
went to display location 044 redundant brake pressure switch and it was at 00 ( per manual this means switch is closed = normal operation.)
went to location 045 and with new control module it does not change from 00, so I thnk this may be why it never releases parking brake.
So what can I do for this part of the problem? I would imagine one of the switches is not working. As you were mentioning above, if I unplug this switch and short it out it should both change the indicator to a 01 and make brake lights illuminate. I found the two that look the same and had pigtails coming off sensors and also one that has a metal clip in it to hold it in place (looks like a bosch injecor style connector) and this plug is right at the sensor. Is the other one for the brake pedal switch closer to the top of the brake unit? I could not find this fourth connector you mentioned.
One other detail I did not share that may not be relevant. I did break the front windshield and cleaned up a bunch of glass. Some was even buried under the brake pedal. I do seem to get full travel out of the pedal. Unit was covered and glass replaced with in a few days, just waited to clean it up.

See attached pictures, the 2 same brake switches are item 15, near the accumulators under the cab.

The other 2 brake switches are at the brake pedal. They are not pointed out in the picture, but you can see the sensor pigtails.

I found the two on my accumulators and the two on the brake valve.. The two So it appears as if the ones in the front are the actual brake switches and the ones on the accumalotors are the redundant ones.

Ok, so I got a case transmission ecu, once I cleared all diagnostic codes, nothing came back. however still does not move. When I go to position 45mto check foot brake, it stays in 00 and I have no brake lights. So I am guessing that is the problem. I also found in manual foot brake switch is a connector that has a red and tan wire so it helped me located it. Tomorrow I will check for power on red wire and go from there.

Sounds like you have made some progress. Keep us posted. You will also have to calibrate the transmission.

Got machine to move, have a code 46025 which is for open circuit ride control, and relay is missing. Do you have a picture of fuse box and relay placement. My relay box is missing one, not sure if I took it out when I started testing and lost it, or if I put one in the wrong place and I should be missing one. On another note, I found info in manual for transmission recalibration. Any hints or things I need to watch for. Also I notied I do not have auto function in transmision display in cluster. Will that come after I do the recalibration?

Here is the fuse box, early serial number range

Here is the fuse box, late serial number range JEE 0135501~

The transmission calibration is fairly straight forward, just follow the instructions. You will have to have the transmission at operating temperature, in order to do a calibration. Calibration will fail if the temperature gets too low, or there is machine movement. Make sure your park brake is working, or chalk your wheels tight. Make sure the transmission is really hot before you start the calibration. It will cool off during the calibration, and if it falls below the threshold the calibration will fail. I would also recommend doing another calibration after working the machine a hour or so.

I believe your auto function will work after the transmission calibration.

521D, 621D, 721D transmission calibration

Transmission Clutch Calibration
Clutch Calibration ensures the most optimum shifting
of the transmission. Before doing the following
transmission clutch calibration procedures make
sure of the following:
1. The machine is running and the transmission oil
is warm.
2. Engine low idle speed is correct.
3. The transmission is in neutral.
4. The park brake is applied.
5. If steps 1 through 4 have been accomplished,
calibrate the transmission clutches as follows:
A. Put the transmission in the manual shift mode
and the gear selector in 3rd gear neutral.
B. Press the program/reset switch to program.
C. Press the up/down count switch to up count
until the display reads 011.
D. Put the program/reset switch in the OFF
(center) position.
E. Press the up/down count switch to up count
twice, so the display reads 02.
F. 2 00 00 will begin to flash in the display center.
G. After one second, the Clutch Calibration Main
Code status will be displayed in the 3rd and
4th spaces (2 XX 00, the XX represents the
3rd and 4th spaces).
H. The Modulation Cycle Number will be
displayed in the 1st and 2nd spaces (2 00 XX,
the XX represents the 1st and 2nd spaces).
I. During Clutch Calibration, the Clutch
Calibration Main Code will change from 01 to
07 as the process is completed. Code 07
indicates that the calibration process is
complete and the information center will return
to normal working status.
J. If any of the Clutch Calibration parameters are
incorrect, the display center will stop flashing
and display a code in the 1st, 2nd, 3rd, and
4th spaces.
If this occurs, the code in the 3rd and 4th
spaces will be a Clutch Calibration Main Code
09 through 14 and indicate what process the
calibration was in when it was aborted
The 1st and 2nd spaces will produce the
Clutch Calibration Sub Code, which is the
code that informs the operator of the reason
the process was aborted.
K. After completing the Clutch Calibration
procedure, turn the machine OFF for 15
seconds. This sets the calibration in the
controller.



CLUTCH CALIBRATION MAIN CODES
Main Code Meaning
00 Clutch Calibration Mode was not
initiated because one of the
requirements was not met.
01 Adjusting 1st gear.
02 Adjusting 2nd gear.
03 Adjusting 3rd gear.
04 Adjusting 4th gear.
05 Adjusting Forward gear.
06 Adjusting Reverse gear.
07 Clutch Calibration Completed.
08 Operator aborted calibration
procedure.
09 Aborted while adjusting 1st gear.
10 Aborted while adjusting 2nd gear.
11 Aborted while adjusting 3rd gear.
12 Aborted while adjusting 4th gear.
13 Aborted while adjusting Forward
gear.
14 Aborted while adjusting Reverse
gear.



CLUTCH CALIBRATION SUB CODES
Sub Code Meaning
00 Calibration in process.
01 Fault present.
02 Shift lever not in neutral.

ok so I looked at a few things, on the two rows of relays, I do not have the relay on 1st row, 2nd from bottom. I do have one in 2nd row 2nd from bottom even though picture shows it does not take one. When I switched them, unit would no longer move.
So I put them back the way they were. For a side note, I noticed today unit may be idling a bit high. Is there a position in program reset switch that I would get a read out of the rpm?

Then I tried to calibrate clutch and no luck. I figured it was not warm enough, when I went to 007 and then watched the temperature of fluid, driving around in 3rd gear it never went above 70 degrees. I then just held brake while it was in forward and saw temperature start to climb up to 90 ish but I did not want to continue and cause any damage. So I just stopped. I do also remember when I put it in calibration mode I got a 20805 in display ( think it is a code saying it was trying to adjust forward clutches but idle was to high. ) What should I do?