I am having trouble locating refrigerant capacity and oil type as the sticker is too faded on the machine and the manual the owner has does not have the information. Trying to help a friend replace the a/c compressor ,due to excessive clutch current draw, on this july 4th holiday . Any info. would be greatly appreciated. thanks in advance!!!
Not sure what an excessive 'clutch current draw' would have to do with evacuating the A/C unless you will be replacing the entire compressor. If doing so, it is not required but advisable to replace the dryer - IF the 'system' will be 'open' for an extended period. IF the leak / bleeding of the system is very slow there will be little or no oil required (depending on what's replaced) as it settles to the lower parts of the system when it changes from a 'mist' to a liquid as the pressure lowers. The 'capacity' of the unit is based upon a total vacuum being drawn. If this is not done, less Freon is required. A good approximation would be 32 oz for a Deere, however a better way would be to measure HIside and LOside pressure with gauges. IN THE OLD DAYS with po' folk like me . . . what you did was run the tractor / vehicle at a good RPM (around 2,000 for cars, trucks - 1,500 for tractors) A/C on max, and charge the system until the 'return line' at the 'compressor' gets COLD (on a hot day). Not saying you should do that, and I expect dissenters that make a living working on A/C's, but having many years of experience, it works.
Is it a Sanden compressor? If so here is the procedure for changing the coil, no refrigerant required. If you do have to break into the system, somebody on the forum with access to the proper computer system will have the proper refrigerant weight eventually. Failing that, I can tell you the superheat method. The above method works, of course, but can leave you low or high on refrigerant depending.
I have never seen -every Deere compressor- but I would think it would be very unusual to not be able to replace a clutch coil without having to open the system. A lot depends on how much room there is to work on the compressor and, if there is very little room, can you move it to a workable location. Opening the system would be a -last resort for me-. Sanden makes very good compressors so I would think a clutch coil failure would be rare.