Kubota AC Repair

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.

many thanks

Greg

Replies:

• Re: Kubota AC Repair Mark Robke 18:36:18 07/11/14 (0)
• Re: Kubota AC Repair MSM 14:21:55 07/10/14 (0)
• Re: Kubota AC Repair jm. 12:29:47 07/10/14 (3)
  • Re: Kubota AC Repair psbhouston 12:48:04 07/10/14 (1)
    • Re: Kubota AC Repair jm. 14:56:41 07/10/14 (0)
  • Re: Kubota AC Repair psbhouston 12:47:41 07/10/14 (0)
• Re: Kubota AC Repair Allan In NE 10:43:26 07/10/14 (2)
  • Re: Kubota AC Repair psbhouston 10:58:58 07/10/14 (1)
    • Re: Kubota AC Repair psbhouston 11:04:51 07/10/14 (0)

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