Posted by psbhouston on July 10, 2014 at 10:09:05 from (64.253.68.106):
I could use some advice. I have a Kubota M9540. The evaporator in cab was plugged. Cleaned it out and now it blows strong air thru the system. I hooked up manifold gauges and both Low/High side pressures were too high. (50/350).
I am sure that one of my guys added freon in the field and overcharged and introduced air into system. I evacuated the system and checked for leaks. None noticed. The systems holds 1.87 to 2 lbs of R134. I charged it with about 20oz and pressures are already back to 40psi Low / 280psi High. Air temp at vent is 67degrees so its cooling a bit - but what am I missing?
Manual says clean condenser / check "heat sensitizing tube and expansion valve??? What is a heat sensitizing tube?
I thought expansion valve would not cause high pressures on both sides? But - I know only enough to be dangerous. Need help please - don't want to kill the system.
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