Allis 7040 air conditioning system
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=196598
Printed Date: 11 Feb 2026 at 10:51am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis 7040 air conditioning system
Posted By: captaindana
Subject: Allis 7040 air conditioning system
Date Posted: 10 Aug 2023 at 8:05am
How many pounds of r134 does it call for? Thanks! Dana
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Blue Skies and Tail Winds
Dana
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Replies:
Posted By: Alvin M
Date Posted: 10 Aug 2023 at 10:52am
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on from new A6 3.8 Seltec Kit 3.25-3.4 New delco A6 3.25-3.50
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Posted By: captaindana
Date Posted: 11 Aug 2023 at 8:55am
Thank you!
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Blue Skies and Tail Winds
Dana
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Posted By: tbran
Date Posted: 11 Aug 2023 at 9:24am
FROM OUR EXPERIENCE.. on older systems they are like mother in laws.. each a little different. We always charge the older systems on a 90 degree day to no more than 225-250 on the high side and it should be less than 20 on the low side WITH THE SIDE SHEETS ON. Then it will be cold at the evaporator, the air flow will determine BTU cooling - Then at about 1500 RPM close the doors and turn the fan to low - watch the low pressure - it should go to 12-14 PSI and the thermostat should kick off the compressor. Anything abnormal, there is an issue .
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: captaindana
Date Posted: 11 Aug 2023 at 10:35am
Thank you Tim!
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Blue Skies and Tail Winds
Dana
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Posted By: CptPerez
Date Posted: 11 Feb 2026 at 8:13am
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most 7000‑series systems that were converted from R12 to R134a seem to run fine with roughly 70 to 80 percent of the original R12 charge. If you know the original spec, that usually gets you close. Curious if you’re still running the stock compressor and hoses, or if anything was changed during the conversion.
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Posted By: Vaterlemon
Date Posted: 11 Feb 2026 at 8:27am
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I usually put in around 3 pounds of R134a. The system cools well at that charge without flooding the compressor. Keep an eye on pressures as you fill.
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