A C problems Kubota M105S

NHbalerman · Jul 10, 2016

I am having problems with the AC it was working fine and the next morning it would not work,the fan works ,the light is on at that push button,the temp is set all the way cool but my problem is the compressor is not coming on and there is no fire to the compressor,I have checked the fuses under the dash under the hood and the breakers on top of the cab,put a jumper wire on the high pressure switch but it does not have any fire to it either,dont know what else to do. Thanks

Ken Macfarlane · Jul 10, 2016

Did you check the handful of fusible links the kubotas use?

ben brown · Jul 10, 2016

im beyt your low on Freon

4520BW · Jul 11, 2016

Try jumping the low pressure switch. That will tell you if its low on Freon or if you have an electrical issue.

NHbalerman · Jul 11, 2016

I did jump across the switch and I think that I have checked all the fuses that I can find,but I will keep looking

Tx Jim · Jul 11, 2016

IMHO one of the cheapest investments you could make is purchasing a set of R134a gauges and learn how to CORRECTLY utilize them if you don't already have them. According to my Kubota M7040 tech manual there is also a fuse for AC under the hood at location "Y".

MARK ROBKE · Jul 11, 2016

I would think the hi psi switch is normally closed,so jumping it would do nothing anyway.If your tractor has a ccot system,like most cars,(an accumulator instead of a drier) you would have a low pressure switch on the accumulator.Check for voltage there,and jump the terminals if you do.If clutch engages and it cools good=bad switch;if it engages but does not cool good=low on refrigerant.If no voltage go back to the switch,or fuse,or possible relay for the ac clutch.Maybe wiring issue also.Mark

NHbalerman · Jul 11, 2016

Ok I will see if I can find a low pressure switch

guido · Jul 11, 2016

Hello nhbalerman,

Besides checking the fuse At D, also check the relay at y,

Guido.

jm. · Jul 11, 2016

M7040 as pictured below and M 1055 are close to the same but your fuse is in a different location. I am with most of the other posters your low pressure switch is open because of low Freon. As the other poster says jump it and see but once you see the compressor work you will need a set of gauges to add the Freon right. Ninety percent of the KUBOTA air problems we see in the shop are folks adding too much Freon after their condenser stopped up . That system is loaded with safeguards, high pressure switch will kick out if head pressure gets too high.

jimg.allentown · Jul 11, 2016

Freon is a DuPont registered trademark. We have not used it since about 1993. These days, it is called refrigerant R-134a.

A C problems Kubota M105S

NHbalerman

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Ken Macfarlane

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ben brown

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4520BW

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NHbalerman

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Tx Jim

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MARK ROBKE

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NHbalerman

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guido

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jm.

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jimg.allentown

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