Re: OT;Caterpillar 330c air conditioning

Posted by NC Wayne on June 28, 2006 at 20:24:04 from (152.163.100.74):

In Reply to: OT;Caterpillar 330c air conditioning posted by caterpillarman on June 27, 2006 at 18:35:05:

I have to agree with Jonthan, one of the first thing I check when I get a customer says the A/C doesn't seem cold enough is the evaporator coil. Well actually the first thing is checking the pressures and then typically I move straight to the coil based on what I find. The problem I run into is to trying convince the operators that the machine has to be run with the doors shut all the time for the system to stay even relatively clean. That's a hard sell, especially for an excavator operator, and even more so if the machine's being used to set pipe, etc and the door is being left open for communication purposes. Still I have to stress to them if they want it to work when they need it, run the heat when it's cold and, if it's hot run the A/C, but don't run it with the doors open.... The filter behind the cab for the outside air intake is a paper filter and does a decent job of cleaning the air if outside air is being used but the one at the actual intake in the cab isn't so much a filter as a piece of extreemly course mesh to keep big stuff out. I've cleaned out two so far this year and both had the coils so stopped up with dust that I was really suprised that it had been passing enough air for the heat to have been working over the winter. If the 330c's A/C setup is anything like the one on a 320B it's a real pain in the a-- to take all the interior out from behind the seat and then to open up the housing in order to access the coil. The bad thing is the heating coil is first in line with the A/C coil burried behind it so it's not even possible to really blow the whole thing out using compressed air because the trach winds up just getting caught between the two coils making matters worse instead of getting blown out. Good luck.

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