I have a 7610 cab tractor bout a 85 model.How much should the low side pressure be at the compressor?I don't know the brand because it's been painted over.It's been hot here in mo. and it would be nice to get the ac working better but don't want to put in too much freon.Oh,I'm assuming it's 134-a ?
freon pressure
- Thread starter jake123
- Start date
- Views: 14961
It should be r12 if it's an 85. That is unless it has been retrofitted. Google r12 and r134a fittings an look at the images. It's not too hard to retro it. And you'll want to because 12 is high dolla. If'n you can get it
hizoot
Gold Member
There isnt a magic pressure number...but needs to be slightly above freezing temp on the gauge.(once the cab has cooled down to low 70's)
There is a corresponding temperature chart on the guage for each refrigerant. To correctly charge it,there are alot more readings than just pressures...such as outdoor ambient,indoor (cab) ambient,line temps ,superheat,subcooling,etc....
superheat on lowside should be 12 degrees,subcooling on high side should be 3 degrees
..oh,btw...this is at 1500 rpm
There is a corresponding temperature chart on the guage for each refrigerant. To correctly charge it,there are alot more readings than just pressures...such as outdoor ambient,indoor (cab) ambient,line temps ,superheat,subcooling,etc....
superheat on lowside should be 12 degrees,subcooling on high side should be 3 degrees
..oh,btw...this is at 1500 rpm
Well I wish I could get the cab in the 70's lol I think i'll put my ac temp guage in the vent and try to lower the pressure first,notice temp and i can always add some more if it gets worse.I will keep it at 1500 rpm's also,thanks for the info.
Not so fast, your a/c gauge MUST have a 134 scale on it.
As for R-12, not is it only big bucks, you must be licensed and have a reclaiming station.
RickB
Super Star Member
- Joined
- Sep 18, 2000
- Messages
- 15,143
- Location
- Up the road from Dollar General WNC
- Tractor
- Just a Scag
That value is pretty much immaterial.
