Too much freon???

[Dadnatron]

Too much pressure in the AC system (ie too much 'freon') will typically cause the compressor to NOT kick on. If you have a clutch problem, it could be that there was a discrepancy between what the clutch and belts were 'trying' to do and what the compressor would allow them to do were 2 different things.

I have a JD, and last year, my AC started decreasing its coldness. I tested pressure and it was low, so I just 'dumped' a can in the system, suspecting I had a leak, so I went to the high side of 'full'. After that, I still couldn't get any cold air... so I fussed around with it for quite a while, suspecting my AC was 'out' somehow that I couldn't recognize. I went online and one thing I found was that too much pressure/too full of a system will cause the compressor to not function. I checked pressures again, and they were still on the 'high' side, so I bled off some and bamm.... I watched my compressor begin cycling. I KNOW this can happen now, so I am extra careful to insure that I watch both the compressor and the gauge when I charge any AC system.

 

[Coyote machine]

He did say belts are fairly new so that mean's belts had been changed.

If you say so: it was not clear anything had been done, especially since he had said no one had touched the tractor since he owned it. Ambiguous much?!:confused2:
I go by what's written, unless of course what's said isn't what's meant, as in this thread.:confused3:

 

[Complete Turf Care]

So you did what we did and it helped your situation.

That痴 good to know.

 

[Coyote machine]

OP, here's what I'd like to know. If no one touched your tractor, except you, how did your AC system get over full to begin with? Systems do not overfill themselves. :confused2:

 

[The Fred]

I over charged my own 2 years ago when I installed a turbocharger on my L3940 Cab but the A/C worked just fine until this year when we have had unusually hot weather. It's the same A/C system you have.

My symptoms were a click up in behind the headliner (ceiling) and the A/C would blow warm until the click of the relay was heard again. There's a sensor in the high side line to protect the system in the event of over-pressurization. In my case the high side was bouncing off 300 lbs.

I recycled the charge and soon realized I had 1/2 pound too much R134a in there. Once I got the charge right the system is running perfectly.

I do fair amount of A/C work on cars and I see this issue come up after someone charges a system with a can from the auto parts store. In my case it was 8 ounces too much that reared it's head on the first 95 degree day we had a month ago.

The only way to get the charge correct is by weighing it. The other method is using a chart to check static pressure of the system in a temperature controlled environment. In your case at 70 degrees F your pressure should be 70 psi. It's hard to check outdoors but the best time is in the shop maybe first thing in the morning before you use the machine, Low and high side should be the same pressure.


Good luck, Fred

Pressure - Temperature Chart for HFC-134a

 

[4570Man]

OP, here's what I'd like to know. If no one touched your tractor, except you, how did your AC system get over full to begin with? Systems do not overfill themselves. :confused2:

I’m guessing it wasn’t.

 

[Complete Turf Care]

OP, here's what I'd like to know. If no one touched your tractor, except you, how did your AC system get over full to begin with? Systems do not overfill themselves. :confused2:

That's what I don't understand either.

I bought it with about 250 hours on it and I put another 1000 on it and I don't have any record of any maintenance to the AC, other than the belt about 300 hours back.

 

[Coyote machine]

Are sight glasses still used for auto AC systems? How about on tractor AC? Back when I had my shop we had a Snap-On AC station that included a vacuum system, a charge tank for old style Freon, and gauges to read pressures in the lines, etc., and an in-line sight glass where one could see flow of Freon through the glass. One could see if there were too many bubbles in the flow - and indicator of not enough Freon charge in the lines.

 

[countrybumpkin]

Very few if any have the sight glasses anymore.

1300 hrs and now it’s has to much Freon , I don’t think so, you have a something else wrong in the system someplace causing the pressure to build.

 

[The Fred]

Very few if any have the sight glasses anymore.

1300 hrs and now it’s has to much Freon , I don’t think so, you have a something else wrong in the system someplace causing the pressure to build.

HOT WEATHER this year compared to before.

What's going to make more pressure in the system if nobody fooled with it? That's right nothing will, think about it.