If your exp valve or orifice was plugged, your high side would be SKY high, like 400+ and low would be basically close to zero (suction from compressor).
If it has never been apart, leave it alone & clean everything up really really well. High high side is typical of low airflow across the condenser. High low side is indicative of hot air flowing across the evaporator. Yours aren't too far out of line for dirt, or low airflow across the condenser, in my opinion (depending on the actual air temp and if the cabin doors were closed, etc).
Replacing the TxV is at this point the last thing I'd do. First run the water hose over the condenser with the engine running and see if the high side pressure comes down. If it does, what's the low side doing? It should come down too.
With the hood up and checking a/c pressures on most tractors your high and low sides are GOING to be high, lack of airflow across the condenser. When the hood is down, air is pulled by the fan across them. Hence, the reason I suggested using some water to cool the condenser with the hood up.
These tractors have a scroll compressor which is VERY efficient, also expensive if you have to replace it. Because they are so efficient they will many times take a very long time to equalize. Remember, the condenser is under a lot of pressure, the evaporator a lot less pressure, and there are two ways for them to equalize, through the TxV or through the compressor. The TxV may "close" enough to stop flow with the engine off forcing refrigerant attempt to equalize through the compressor. Very common.
Another thought, if the TxV is "plugged", what's it plugged with? And why? Those questions need to be addressed. Simply replacing the part doesn't solve the whole problem, particularly with a/c systems. Typically if the txv were plugged, or stuck, the high side pressure will run up to around 450-500 psi, at which time the high pressure switch will turn the compressor off. You arent' seeing this, thus I do not believe that the txv is the issue here. But I could be wrong.
If it has never been apart, leave it alone & clean everything up really really well. High high side is typical of low airflow across the condenser. High low side is indicative of hot air flowing across the evaporator. Yours aren't too far out of line for dirt, or low airflow across the condenser, in my opinion (depending on the actual air temp and if the cabin doors were closed, etc).
Replacing the TxV is at this point the last thing I'd do. First run the water hose over the condenser with the engine running and see if the high side pressure comes down. If it does, what's the low side doing? It should come down too.
With the hood up and checking a/c pressures on most tractors your high and low sides are GOING to be high, lack of airflow across the condenser. When the hood is down, air is pulled by the fan across them. Hence, the reason I suggested using some water to cool the condenser with the hood up.
These tractors have a scroll compressor which is VERY efficient, also expensive if you have to replace it. Because they are so efficient they will many times take a very long time to equalize. Remember, the condenser is under a lot of pressure, the evaporator a lot less pressure, and there are two ways for them to equalize, through the TxV or through the compressor. The TxV may "close" enough to stop flow with the engine off forcing refrigerant attempt to equalize through the compressor. Very common.
Another thought, if the TxV is "plugged", what's it plugged with? And why? Those questions need to be addressed. Simply replacing the part doesn't solve the whole problem, particularly with a/c systems. Typically if the txv were plugged, or stuck, the high side pressure will run up to around 450-500 psi, at which time the high pressure switch will turn the compressor off. You arent' seeing this, thus I do not believe that the txv is the issue here. But I could be wrong.
