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4230 Freon and oil charge?

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PostPosted: Wed May 30, 2007 1:30 pm    Post subject: 4230 Freon and oil charge? Reply to specific post Reply with quote

I just changed out the ac compressor, dryer, expansion valve, and flushed/blew down the lines, condenser and evap cores. How much freon and oil needs to be added back to the system? I have a 4030 book that says it holds 11 oz of oil and 64 oz of freon. Would this be correct for a late model 4230?

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PostPosted: Wed May 30, 2007 3:09 pm    Post subject: Re: 4230 Freon and oil charge? Reply to specific post Reply with quote

If you're charging with R-134a, the general rule of thumb is to charge with 80% of the recommended R-12 charge. Around 3.5 lbs of R-134a in a Deere tractor equipped with a Sound-Gard will give usually give you about the best results, but you may want to start with 3 pounds, run the system for 10-15 minutes to normalize it, and then see what your pressures and air-duct temps look like. Run the engine at about 1200-1500 rpm with the thermostatic switch turned to max and the blowers on high. If it doesn't seem to be cooling sufficiently, add refrigerant an ounce or two at a time and watch the duct temp between additions. Keep in mind that air duct temp will depend a lot on how the thermostatic switch is adjusted and at what point it shuts the compressor off, as compressor cycling is controlled by evaporator temp. All the switches vary some and some will allow a colder air duct temp than others before cutting power to the compressor. You don't want it too cold or the evaporator may freeze up. Also make sure your main cab filter and the foam recirculation filter above the plastic grille or new or at least good and clean. If the recirc filter is plugged, too much ambient air is drawn in and not enough already-cool cab air is recirculated and your air-duct temps will suffer. The 4230 manual calls for the same 4 lbs that your 4030 book does. Charge by weight alone and don't pay any attention to the sight-glass if using R-134a - a full charge of R-134 will still have bubbles in it. In fact, I've recently seen new R-134-compatible receiver-driers from Deere that don't even have a sight glass anymore. And normally we don't add any additional oil, either. If you're using a rebuilt compressor from Deere, it should have sufficient oil in it for the system to work fine, at least they always have for me. Too much oil will cause as many issues as too little. You might consider putting in a charge of leak-detection dye or charging with pre-dyed R-134 if going that route, as it will make finding any leaks in the future much easier.

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PostPosted: Wed May 30, 2007 5:49 pm    Post subject: Re: 4230 Freon and oil charge? Reply to specific post Reply with quote

If you are getting your compressor from Deere:

Do not trust the instructions that come with the compressor. The instructions claim the compressor has a full system charge.{10-11 oz} I've found that maybe 1 in 5 has this. The rest only have a "replacement" charge of about 5 or 6 oz. I'm talking about the TY6770 and the latest replacement for it, SRC's SE501457. So figure on dumping the oil and pouring in a full charge of PAG 150 if you're sticking with the original style compressor. Hopefully, you're doing a complete flush with OTC's excellent {and darned expensive} set-up.

Some extra effort spent now getting everything clean on the inside and out sure helps efficiency and longevity.


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