A/C not keeping up on M6800

[moesfarm]

I just bought a 02 M6800 with 1900 hrs.I thought the A/C was really working good and it was as long as temps. were below 80 degrees.When the temp get above 80 it gets kinda uncomfortable in cab.I have put the guages on and the pressures are about right.When i first got it I had to add 134a untill sight glass on dryer cleared up.
I have blowed out condensor and checked cab filter.
Would a 12VDC extra push fan on the condensor coil help my problem?
I guess i could have the windows tinted but i had rather not.

 

[TripleR]

A TBN member did this and reported it really helped, hope there isn't a problem posting the link as many of us belong to both forums:

http://www.tractorbynet.com/forums/.../214851-improving-kubota-ac-cab-tractors.html

 

[Tx Jim]

If not bubbles are visible in sight glass you have installed too much R134A. R12 & R134A are different when it comes o bubbles.

 

[Bulldog]

On my 9000 the A/C performance always has been affected by how clean the radiator is. In dirty conditions it needs cleaned at least daily and sometimes several times a day to keep it working right. My opinion all Kubota tractors need bigger cooling systems.

 

[TripleR]

On my 9000 the A/C performance always has been affected by how clean the radiator is. In dirty conditions it needs cleaned at least daily and sometimes several times a day to keep it working right. My opinion all Kubota tractors need bigger cooling systems.

I agree, the AC in our L570 and M8540 keep us comfortable, but the AC on our Case CX80 would run you out of the cab and we could run it on lower settings. It was not as susceptible to debris as our Kubotas. Overall we prefer Kubota, but do wish the AC was a little stronger.