dk55 ac questions

[arsenix2001]

Careful with that tho, my compressor on my ls190 and c190 skid steers stayed on all the time.

 

[8404]

what part needs replaced to make the compressor work correctly, im going to put in the shop tomarrow

 

[grsthegreat]

My DK45 has 4 air filters, but there all accessable fromn the underside of the roof via 4 separate access doors. Each has 2 screws.

I second or third the low freon post. this is what happens to residential units when there low on freon also. they freeze up solid

 

[8404]

Ok so i had my local car mechanic look at my AC and he hooked it up to some kind of pressure checking thing and he said my tractor held 35psi in the AC system at idle and at high RPM, he said he thought it was were it should be and he didnt add any Freeon but he also said the compressor didnt cut on and off with him either.. and wasnt shure if the tractor system even had pressure switches. .... so i used the tracter for about 5 hours of bush hogging and it again stayed very comfortable for about an hour or so before the vents stoped blowing air out, the vent were still cold just no air flow. so i started turning off the AC for a coulple laps around the feild untill i couldnt stand the heat and would turn the AC back on again and it worked great the airflow was hard and verry cold. but of course i couldnt go long before it would ice up again. so im still need some advice from other kioti owners.
-does this AC unit have pressure switches?
- how much PSI should the system be holding? as of now its 34,35 PSI
-and will i need only Kioti parts to fix it or can a local Aircondision shop get
the parts to fix this?

 

[steve0413]

I'm no A/C expert, but I've seen where it needs to be 50-55 psi.

Edit: I got that number off the R-134a can. It's based on an ambient temperature of 100 degrees. If Northern Mississippi is like here in Arkansas and it was tested outside, then it seems to me that you need to add refrigerant. According to the table on the can, 35 psi would be normal if the ambient temperature was 60-70 degrees. Also, the freezing up is a definite sign of low refrigerant.

 

[slc10844]

Since it is working until the evaporator freezes it has enough freon. There are usually 2 pressure switchs and a relay in the system. Both switchs are usually mounted on a refrigerant line, one before and one after the compressor. A high pressure switch may actually be mounted on the compressor and protects the system from high pressure. The low pressure switch cycles the compressor. Both switches, on most systems, feed a relay that controls the compressor. If the relay sticks it will cause the compressor to stay engaged all of the time. Check the clutch by disconnecting the battery to see if the clutch releases (rotate the clutch by hand). Some relays are fed by battery current and are hot all of the time, even with the key in the off position. If it releases there is probably a stuck relay in the system somewhere, usually in the fuse panel. Some of the new automotive systems also use a computer to control the A/C depending on input from various sensors. I'm not familiar with the Kioti system, but I doubt that there is a computer used for A/C control.

 

[arsenix2001]

Ill say again, if you are confident you have all filters and coil fins clean, it appears that the system is operating on low pressure, and you cannot accuratly measure just by guages. It needs to be evacuated and recharged to the proper weight spec of freon and lubricant specified for the tractor. Your symptoms still fit my original guess. And lastly I would not be suprised if it has no pressure switch, none of my new holland skid steers did. If it were me, i would be finding a dealer to reference thier shop (not owners) manual to check all filter/screen locations and the operation of the compressor. **** they should know right off the bat if they work on many. Have them properly recharge your system and add tracer dye. You will then have working ac, and can check for leaks with a black light

 

[8404]

arsenix2001, I hear you im going to call tomarrow, Im one of those people who bought a Kioti knowing there is no dealer near by so have two buy parts online then find a mechanic to help me fix it. So ill call a Kioti dealer tomarrow. I only found one switch looking thing on the inside of the canister looking thing it has wire going to it. and one relay switch in the fuse box. I checked the compressor too, it turns by hand with the wire disconected, i toulk a picture of some parts incase someone can see something important.

 

[slc10844]

Check the part number of the a/c relay with one of the other relays, like the headlight, and if it is the same part number switch the relay and see if the a/c runs and cycles. If there is no change you might an expansion valve in the system. The switch on the dryer (the black canister) is the low pressure switch. This appears to be a similar to the old Chrysler system which used an expansion valve to regulate the flow of freon. All the low pressure switch does with this system is shut the compressor down if the freon is below a certain pressure. The newer systems regulate the flow by turning the compressor on and off. An expansion valve is like a rectangular block of metal at the end of the line from the dryer.

 

[slc10844]

The dryer has a sight glass on the top. Run the a/c for severl minutes until it stabilizes. Look in the sight glass and you will probably see air bubbles. A constant flow of bubbles may indicate the need for freon. If you only see occasional bubbles you are OK. The best way is to drain the system and recharge with the recommended amount of freon.