[AT] not antique but tractor related.

Sun Jul 21 20:43:36 PDT 2019

The real mystery is why does it only work when we start using the 
tractor in the middle of the day??  It only happens when I s tart the 
tractor and the cab interior is hot......   I don't have the patience to 
diagnose things with the heat and humidity here and no real place to 
work anymore.  The ice storms and tornadoes took out my tractor shed and 
shade trees.  The barns are full of stuff that was in the sheds.  I am 
really getting sick of Oklahoma.

Cecil

On 7/21/2019 10:27 PM, Spencer Yost wrote:
> I know zip about refrigeration, and Brad clearly knows a ton more, but 
> I can tell you the solutions I have had in cars I’ve had over the 
> years the with those same symptoms:
>
> Dirty condenser(power steering leak put oil on it which attracted 
> dirt, etc and had to fix the power steering leak too).
> Blocked condenser( never understood how a condenser could get 
> “blocked” but replacing it worked)
> Bad compressor
> Bad wiring to the compressor clutch(worked intermittently)
> Low freon(but you already checked that)
> Bad cabin fan(it turned but actually was running on low regardless of 
> the setting).
>
> As a data point, I must say the cabin fan and bad compressor most 
> closely matched your symptoms.
>
> As a second data point, I must admit my umbrella is no match for an 
> air-conditioned cab (-;
>
> Because I know zip about refrigeration these were all repaired by the 
> local mechanics(Except the low Freon which I can handle, and the 
> electrical problem with the clutch which I managed to fix myself), so 
> take it with a grain of salt.  I have to assume they they told me the 
> truth and I trust them but????
>
> Doubt this helps but I’d thought I’d throw that out there just in case.
>
> Spencer Yost
>
> On Jul 21, 2019, at 10:48 PM, <bradloomis at charter.net 
> <mailto:bradloomis at charter.net>> <bradloomis at charter.net 
> <mailto:bradloomis at charter.net>> wrote:
>
>> If it’s that hot and cutting out on a HP switch, it could be actual 
>> high pressure. I’d be leery of bypassing a HP safety. Is there a 
>> possibility of non-condensables in the system? Of course that would 
>> mean you’ve had the system open or it has run in a vacuum with a 
>> leak. I never did automotive A/C only commercial and industrial 
>> refrigeration. In commercial 134a does not do well with dirty 
>> condensers. Can’t tell you home many compressors I’ve replaced on 
>> beverage coolers like every convenience store in the world has 
>> because the condensers suck a zillion tons of dust and lint a day. 
>> R12 would tolerate periods of high discharge way better than 134a. It 
>> doesn’t do well in my vehicles either. If it gets really hot as 
>> California can, any extra load on the engine, be it my VW diesel or 
>> my truck, you can tell the A/C output drops 10-20°. Temporary, but 
>> noticeable on a really hot day.
>>
>> Are the air filters you speak of on the evaporator or condenser? 
>> Clean your condenser, again. Or you have an electrical issue that is 
>> causing something to open, the clutch, a safety, overload. Harder to 
>> track for sure as you’d have to ohm those items when the A/C quits 
>> while it’s hot.
>>
>> Best I can think of.
>>
>> Brad
>>
>> *From:*AT <at-bounces at lists.antique-tractor.com 
>> <mailto:at-bounces at lists.antique-tractor.com>> *On Behalf Of *Cecil 
>> Bearden
>> *Sent:* Sunday, July 21, 2019 7:32 PM
>> *To:* at at lists.antique-tractor.com <mailto:at at lists.antique-tractor.com>
>> *Subject:* Re: [AT] not antique but tractor related.
>>
>> I have worked on vehicle air conditioning systems since I was 13 yrs 
>> old.  That is about 52 years.  I have seen a lot of crazy problems 
>> and fixed every one that I was asked to work on. Having said that, I 
>> am stumped.  The TS110 money pit has always had a great air 
>> conditioner.  a couple of weeks ago I was cutting hay in a field a 
>> little ways from home, so I had the atv to travel back and forth in 
>> case of breakdown, etc...  I baled for about 3 hours, then stopped 
>> for lunch.  I returned and started the tractor and noted the a/c was 
>> not working.  The compressor was not turning.  I tried many different 
>> thing including bypassing the low pressure cutout that had been 
>> replaced a day earlier.  It finally started working after I had the 
>> doors open to the wind and the interior of the cab cooled off.  This 
>> took about an hour.  It worked fine.  I put it in the shed.  2 days 
>> later I had to bale another field and got started about 1pm.  It was 
>> hot and the A/c would work for about 2 or 3 minutes then quit for 10 
>> to 15 then run just a little then quit again.  I spent the next 3 
>> hours in a 95deg greenhouse.    I spent last Friday morning checking 
>> the freon levels and the switch connections.  I found the air filters 
>> were really badly plugged.  I found the only ones were 65 miles away 
>> and got them.  Without the filters the A/C worked fine and had the 
>> correct pressures for a R134 system.   Today I got started baling 
>> about 10 am and baled until 5pm and only once was it blowing not real 
>> cold, but other wise worked fine...   Later this evening it was 
>> starting to rain and I went to back it into the shed, the interior of 
>> the cab was hotter  than a 2 dollar pistol.  The A/C would not blow 
>> anything but hot air.  The heater does not work on this so, it is not 
>> heater hoses.  When the interior is hot, the system will not get 
>> started....    I am thinking a high pressure cutout switch.  I really 
>> hat to bypass things, but I have seen so many NH tractors at sales of 
>> this vintage that have an extra switch in the cab for turning on the 
>> A/C clutch, I think maybe it is a design defect as there are so 
>> many......  Anyone had any experience like this???
>> Cecil
>>
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