Am working on a unit that has an obvious restriction within the A/C circuit...Discovered this is a fixed orifice system...Planned on changing receiver/dryer and was informed by Cat that orifice is contained within this assembly...They also list an orifice assembly that was superceeded by this new dryer assembly...My question is this...Is there an orifice in this system that needs to be removed so that new assembly can do its job?...If so,where would it be located?...Evaporator liquid line from condensor I assume...
If you have the orifice tube it is in the accumulator and can be replaced. The best way to find the blockage is to run the system and look for the frost on the outside. Could be a drop of water that reclaiming the gas and revacuming would correct??? Later Bob
Thanks for your reply...Am going to look at this in more detail tomorrow...Not intimately familiar with set up on this one,but I know what to look for...Will have to swag it a little here(scientific wild guess)...You are correct on diagnosis...Noticed that guys with D6R machines had same symptoms this one does...Low pressure/Suction @ less than 20 carrying to a vacuum....High side crazy high,350 to outa control...My first time on this site...I am a very technical kind of guy, glad to find this...Will get to the bottom of this and post a solution tomorrow...Thx. bro....
I picked a couple of D6N at random (there are 20+ different models) and both listed a separate Part Number for the orifice to that of the Part Number of the receiver/dryer. Buy the receiver/dryer and the orifice comes installed, but you can get the orifice separately. Post the S/N of your machine, or at least the S/N prefix.
This may or may not apply, but we have had numerous failures on Cat A/C systems that incorporate quick couplers at the dryers. Mostly on machines where the dryer is mounted on the engine, usually a dozer. the vibration causes the lock balls in the coupler to eat into the groove on the male end, resulting in loss of flow and freezing at the coupler. Easy to spot when system has been running for a while. Just another thought on where to look.