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Kubota L4310 HST with Cab is regularly HOT

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HardWorker
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2002-04-17          37570


I was curious if anyone out there has the L4310 HST with the cab? The A/C will not cool properly and the tractor overheats as well. Brand new. It seems that the HST heat exchanger, the AC, the radiator and the battery are all jammed into the same small area and expected to be cooled. Doesn't work with much stress or high ambient air temp. Anyone in the same boat?

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Kubota L4310 HST with Cab is regularly HOT

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Bird Senter
Join Date: Jun 1999
Posts: 962
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2002-04-18          37571


HardWorker, I've no personal experience with cab Kubotas, but the only time I've heard of such a problem was an M6800, and the mechanics found that the only problem was debris in the front end from dust, seed, etc. that accumulated there while he was cutting hay and mowing pastures. The solution was simply washing it out, and the AC worked fine again. ....

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Kubota L4310 HST with Cab is regularly HOT

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TomG
Join Date: Feb 2002
Posts: 5406 Upper Ottawa Valley
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2002-04-18          37575


You'd sure think that a tractor that's designed to use an air-conditioned cab would be adequately engineered to accommodate the heat load. If not, it's probably cause for grumbling to dealer etc.. It's possible that a simple deflector could be designed to get some heat out of the engine compartment.

On the other hand, it's possible that the situation is that both the engine and HST are running a bit hot during a break-in period. Perhaps everything will run better after the tractor has a few hours. I also recall and old discussion about whether HST's run cooler on synthetic fluid. I don't remember a conclusion from that discussion, but it may be possible to reduce the heat load by using a different hydraulic fluid.
....

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Kubota L4310 HST with Cab is regularly HOT

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Roy Jackson
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2002-04-18          37578


"The A/C will not cool properly and the tractor overheats as well. Brand new. It seems that the HST heat exchanger, the AC, the radiator and the battery are all jammed into the same small area and expected to be cooled."

"the mechanics found that the only problem was debris in the front end from dust, seed, etc. that accumulated there while he was cutting hay and mowing pastures."


The manual for my Deere specifically mentions keeping the radiator and grill clean and clear of debris.
I've not had any problems with the tractor overheating, but a friend of mine (also with a Deere) has had to clean off the affected areas during brush hogging.

I do hit the radiator and grill areas with a hose (air or water) after each use. If you're not doing that...you might want to start. You might also keep a small still brush in the cab so you can brush off any clogging debris as you work.

A car doesn't depend on the grill at road speeds...much of the cooling air comes up from underneath the car (also, road speeds reduce the need for the fan). Our tractors run at very low velocities, thus increasing the importance of a clear path for cooling air flows. ....

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Kubota L4310 HST with Cab is regularly HOT

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Roy Jackson
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2002-04-18          37579


"...small still brush ..."

That should have been small STIFF BRISTLED BRUSH. ....

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Kubota L4310 HST with Cab is regularly HOT

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Morgan Wright
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2002-04-18          37582


The first time my Kubota overheated from a clogged grill I looked around to see who was honking at me. There was nobody for miles around, I thought I was hearing things.

My boat does the same thing...the horn honks if it overheats. Very weird. ....

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Kubota L4310 HST with Cab is regularly HOT

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Roy Jackson
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2002-04-18          37583


"The first time my Kubota overheated from a clogged grill I looked around to see who was honking at me. There was nobody for miles around, I thought I was hearing things.

My boat does the same thing...the horn honks if it overheats. Very weird."

Well, might be weird, but it saved your engine...and a lot of money.
I take it your Kubota and boat don't have temperature gages? ....

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____________________________________________________________________________________
Kubota L4310 HST with Cab is regularly HOT

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ht
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2002-10-02          43265


Did you ever get the overheating problem resolved? I'm looking to purcase the same model and it gets very hot around here during the summer. ....

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Kubota L4310 HST with Cab is regularly HOT

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Charlton2
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2002-10-03          43276


I have a 2000 3710, A/C is cold. The fan blower could use a little more power but it has been adequate. I have used it for two summers.

Have you taken a reading as to the temp of the air coming out of the vent? I will check mine this weekend and let you know.

Dave
....

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Kubota L4310 HST with Cab is regularly HOT

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Art White
Join Date: Jan 2000
Posts: 6877 Waterville New York
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2002-10-03          43278


Many tractor companies pile all the cooling with the batteries and the air conditioner together up front as that is the coolest temp available for the tractor to cool with. We have many of those cab tractors out and we have not had a problem with them when the front is kept clean. ....

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Kubota L4310 HST with Cab is regularly HOT

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jeff r
Join Date: Jul 2003
Posts: 428 burton. michigan
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2002-10-04          43327


Check to see if your compressor is low on r134 refrigerant. You might have a leak and if you do it will not cool being low on refrigerant. Happened to me when I owned a JD 4020 with cab air but the JD used the impossible to get R12. There should be roughly a 20 degree difference between the temperature of the cooled air coming from the evaporator and the outside ambient temperature. You will need a set of AC refrgerate gauges to see if the compressor is running "high head pressure". Boyles LAW at work here guys. ....

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Kubota L4310 HST with Cab is regularly HOT

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wlpepper
Join Date: Apr 2014
Posts: 2 texas
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2014-04-07          189964


My L4310 hst is 2000 year and 1200 hours. In Texas heat every thing must be perfectly clean to cool above 100 degrees. The three radiators, water, oil, air must be whistle clean. I blow out with air then high pressure water. You must remove screen and really clean . When temp is above 100 inside temp still rises into the eighties, but is tolerable. THE SYSTEM IS MARGINALLY DESIGNED. GOOD LUCK ....

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Kubota L4310 HST with Cab is regularly HOT

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Art White
Join Date: Jan 2000
Posts: 6877 Waterville New York
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2014-04-07          189971



It was the late 90's that Kubota brought the first factory cabs out for us to enjoy. It was nearly ten years before anyone else introduced them as a factory option on compact tractors.
They have improved as we would expect from when they were first introduced and the air conditioning system today works much better although it is hard for us in NY to top the Texas air over 100 degree's! ....

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Kubota L4310 HST with Cab is regularly HOT

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Murf
Join Date: Dec 1999
Posts: 7141 Toronto Area, Ontario, Canada
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2014-04-11          190027


The other issue is the double-edged sword being all that glass, while it offers outstanding visibility, it offers zero insulation and further allows some pretty significant solar gain.


Best of luck. ....

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Kubota L4310 HST with Cab is regularly HOT

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Art White
Join Date: Jan 2000
Posts: 6877 Waterville New York
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2014-04-12          190044



Good call on the glass issue Murf! Going back into the seventies when tractor cabs were first introduced most companies had issues! I was fortunate enough to have a friend that did a lot of work with air conditioning on cars. I hired him and had no trouble finding work for him all summer long on all makes of tractors. Today our shop might have several a week during the worst part of the heat where we were several a day!
Back then they found that the lower windows on the front of cabs would run twenty to thirty degrees warmer then the air because of the engine heat. Not like a car with a 50 mph breeze! ....

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