D8T No Reverse

DieselPirate · Mar 4, 2020

Hi all,
I'm new here. Have a D8T s/n: KPZ00863.
The machine will not go into reverse, I have active codes 1405-5, 673-2, and 585-2 coming up on the dash panel. Can anyone provide me with information on troubleshooting these codes?

Thanks in advance!

laycobeau · Mar 4, 2020

585-2 and 673-2 speed sensor #1 erratic output. 1405-5 solenoid #5 low current Best I can tell. anyone know for sure?
one

DieselPirate · Mar 4, 2020

That's correct

Nige · Mar 4, 2020

Check your PM's.

Mark250 · Mar 4, 2020

here is solenoid test procedure for 1405-5

Nige · Mar 4, 2020

#5 solenoid valve (first speed clutch) Diagnostic Code and the machine has no reverse. Hmmmmm.

Mark250 · Mar 4, 2020

Are we sure we are not talking about CID 1401 code which is the reverse solenoid?
may be a misprint?

Nige · Mar 4, 2020

True dat. We can only wait until the OP reposts.
Take a look at the WAX-prefix C7 thread will you please. I'm having issues finding a Flash File Part Number.

DieselPirate · Mar 4, 2020

Which of the 5 solenoids is #5?

DieselPirate · Mar 4, 2020

I've already checked #1 transmission speed sensor and have determined that it is out of spec. Will replace that plus #2 and the harness as it has been spliced back together.

Nige · Mar 4, 2020

DieselPirate said:
Which of the 5 solenoids is #5?

See attachment. I suggest that you double check using the wire colours & numbers on the electrical schematic I sent to you.

DieselPirate said:
Will replace that plus #2 and the harness as it has been spliced back together.

Are you referring to the short harness 217-4627 that it inside the transmission itself.? A known failure mode, especially in view of how hot they get. There is an upgraded harness available that came in from machine S/N KPZ01174 onwards, so your machine has the former design of harness. See attachments for Part Numbers and how to install. You will no longer be able to buy 217-4627.

DieselPirate · Mar 6, 2020

When I pulled the plate on the back of the transmission and locater #5 solenoid It wasnt plugged in correctly, plug was upside down and wouldn't latch. Plugged it back up and that code went away. However, the speed sensor codes still remain and now the machine won't go into forward or reverse...

Nige · Mar 6, 2020

How come it was plugged in upside down.? That makes no sense unless someone unplugged it and reconnected it again, but why were they in there in the first place.? Are you even sure that the 5 solenoids are connected correctly..? Like spark plug leads on an petrol engine has someone got the connectors crossed up.?

Has the transmission been removed from this machine recently or has someone else been in there messing before you were assigned to work on the machine.?

I sent you the Troubleshooting Procedures for all three Codes that you posted in your OP. Did you do those procedures to try to diagnose what was wrong and if so what were the results.?

DieselPirate · Mar 6, 2020

This machine came from the RB auction last year and hasn't really been moved since we hauled it, at that time everything was working fine until they decided they want to put it to work. Supposedly the transmission was rebuilt sometime prior to getting it here

Nige · Mar 6, 2020

So the machine has never worked on your job site. Good to know where we stand. You could have put that info in the OP, it would have been a great help.
I love that word - "supposedly" ......... hardy f'kin har......

In that case start from first pricniples - Assume nothing.
First thing I would do is closely inspect the transmission wiring harness (see post #11). Replace the harness with a new one if it shows signs of having been repaired.
Then work with the Electrical Schematic and make sure that everything is connected correctly tov the transmission solenoids - again assume nothing.
Finally do the Troubleshooting Procedures that I sent to you for the 673-2, and 585-2 and post the results.

That should be enough to keep you busy for a while.

DieselPirate · Mar 6, 2020

Number 1 speed sensor is definitely bad. Tests on number 2 all come back fine. Driveshaft is only locking up in 2F and machine has to be revved really high for machine to move. Before I reconnected solenoid #5 it would lock up in 1F and move at idle. Gonna order the speed sensor and see what happens then. If speed sensor 1 has failed would that cause a code for number 2 as well? Thanks for the help!

Nige · Mar 6, 2020

I strongly suggest that you go through the wiring of the internal transmission harness using the Electrical Schematic and the wire colours/numbers.

I sincerely believe that wiring is wrongly connected (or the internal harness has been badly repaired and wires have been crossed while making the repair) somewhere inside the transmission between the plug on the outside and the five solenoid valves, because correctly plugging in the #5 solenoid connector that you found inverted should not generate the symptoms that you are now reporting.

Go back to first principles. Trace EVERY individual wire in the transmission harness by colour & number and make sure that each one is connected to the place where it should be connected. You have the electrical schematic. It ain't hard.

DieselPirate · Mar 6, 2020

I did trace all wires. They're all hooked up correctly. I made a typo in the earlier post about the wiring that had been repaired. That wire was going to the output sensor on the torque converter. Not the internal harness on the transmission.

Nige · Mar 6, 2020

In that case, did your 1405 Code go away when you correctly connected the #5 solenoid.?

DieselPirate · Mar 6, 2020

Yes. 1405 code went away. Codes for speed sensors remain activ . Machine would go into 1F and move before I connected the plug to #5 solenoid

D8T No Reverse

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