First, 1500 rpm is to high to do any pressure testing while sitting in the garage or in the driveway. 1000 rpm is high enough to tell if the fan is pulling anything. driving down the road puts lots of air through a condenser. The best way to check high, high side pressure is with a garden hose. 134a will come right down to about 200 psi quickly if the system can work.
At 300,000 miles you need to replace the whole system except the evaporator. If you pull the orifice tube it likely will be almost plugged. Now, to dispel the kitchen legend about the desiccant being what plugs the orifice, it isn't the culprit. Crap coming out of the compressor piston rings is. The desiccant won't get to the orfice through a modern condenser, the holes are just to small. The desiccant would have to leave the accumulator, get to and through the compressor and get through the condenser to arrive at the orifice tube. Won't happen. Systems that use a dryer instead of an accumulator don't use an orifice tube. They use expansion valves and the expansion valve is the next thing downstream from the dryer and will plug off from the desiccant and one good size grain will do the damage.
Upload one or more videos to your post. Photo filesizes should be less than 300K and Videos, less than 2MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
