Caterpillar D6R Loss of Clutch Pressure

[dcditommaso]

I appreciate the insight on all this. It would be a stretch to take the PV out of the one D6R and use it in the other.

Could there be a check valve stuck open in the system maybe? The way I’m picturing this from a flow perspective is that the solenoid is opening, and the oil is just stuck flowing in one direction (the problem) instead of to the transmission. Maybe a check valve that’s between the PV and the transmission in some way?

 

[Nige]

Do you have the schematic for the power train oil system and the text explanation of how it is supposed to operate.?

Another question I don't think has been asked. How did this issue start; suddenly overnight or gradually got worse over time.?

 

[Mquinista]

The PV sort of does not direct oil... it does cut off oil ... wich is not the same thing.
I just don´t understand what is a solenoid control doing there... as that is suposed to be a safety feature and u can see my point.

Maybe u can try run the system with the said solenoid at the X RPM feature offline and check pressures.
Some of those tractors also use pressure acumulator, does your have one and its working correct.

And @ 20K hour , is the charge pump good enough?

Good luck

 

[Nige]

Could there be a check valve stuck open in the system maybe?

See the illustration below.

 

[Deimos]

Based on the description of the problem and the steps you took to diagnose it, I can assume that the transmission pump has failed.