Typical JD Air conditioning System pressures.

[4020guru]

What are the typical systems pressure for a John Deere R-134a A/C Unit ? I charged a 4455 yesterday and had the low side at 10 psi. Never checked the hi-side. Cooled really well with a low side of 10 psi. The saturation temp of 40 degrees (ideal for AC) is 35 psi. If I were to bring it up to that low side pressure I am sure I would flood the compressor. I had the tractor running 1500 rpms while charging. Any advice and tips to charging these deeres would be greatly appreciated, and yes I am certified to handle refrigerant.

 

[tim s]

On a hot day the High side will be around 190-210psi and the low from 10-35 psi, I had a 4230 Friday that would not cool and had zero low pressure, I changed the expansion valve and it cool great..

 

[Tx Jim]

Ambient temp affects AC system pressures. Higher ambient temps causes higher system pressures. On 95-100 degree day my 4255 AC high side can get up to 250 psi.