4720 Low AC

[jcalla]

I,m replacing my ac compressor for the 4th time on my 2010 4720 tractor. How do I get the right sub-cooling charge into the system?

JPC

 

[Tx Jim]

AC systems that have failed compressors need to have interior components flushed very well. Are you keeping refrigerant charge pressures within chart pressures. The radiator, condenser & evaporator external fines need to be keep clean similar to their automobile counterparts.https://www.electronicshub.org/ac-pressure-chart/

I have a '91 JD 4255 with 12,000 hrs of use that I've owned since Feb '93 on it's 2nd compressor due to AC clutch failure & a '11 Kubota M7040 with 2000 hrs of use with original AC compressor.

 

[jcalla]

AC systems that have failed compressors need to have interior components flushed very well. Are you keeping refrigerant charge pressures within chart pressures. The radiator, condenser & evaporator external fines need to be keep clean similar to their automobile counterparts.https://www.electronicshub.org/ac-pressure-chart/

I have a '91 JD 4255 with 12,000 hrs of use that I've owned since Feb '93 on it's 2nd compressor due to AC clutch failure & a '11 Kubota M7040 with 2000 hrs of use with original AC compressor.

How do I clean the expansion valve? Should I replace it?

 

[Tx Jim]

In order to clean or change expansion valve one must remove refrigerant utilizing a refrigerant recovery system, disconnect AC lines to R&R EV. Then one must utilize a vacuum pump to remove air & moisture from AC system then reinstall refrigerant to correct level. Observation of AC operating pressures would determine if EV possibly requires replacement.

 

[jcalla]

In order to clean or change expansion valve one must remove refrigerant utilizing a refrigerant recovery system, disconnect AC lines to R&R EV. Then one must utilize a vacuum pump to remove air & moisture from AC system then reinstall refrigerant to correct level. Observation of AC operating pressures would determine if EV possibly requires replacement.

OK, I understand that process. I plan to do all that plus make the changes that Tractor Time with Tim suggested in his video, 6 improvements for better ac . I do plan to replace the TXV also just in case it is dirty. What product would I use to flush the evaporator & condenser while I have both the TXV & ac compressor removed?

Thanks,
JPC