8070 air cond pressure switch
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=142494
Printed Date: 16 Dec 2025 at 4:15am
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Topic: 8070 air cond pressure switch
Posted By: Ron(AB)
Subject: 8070 air cond pressure switch
Date Posted: 15 Sep 2017 at 2:45pm
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I'm installing a new compressor (dryer & exp valve too) and was wondering if it was normal for the compressor not to engage with the key, fan, and ac turned on? Just want to make sure everything works before putting in the 12a. 
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Replies:
Posted By: Ron(AB)
Date Posted: 15 Sep 2017 at 2:47pm
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I was thinking the pressure sensor needs some charge (pressure) to ground the mag. Is that true? |
Posted By: CAL(KS)
Date Posted: 15 Sep 2017 at 2:56pm
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if that system has a low pressure switch it wont engage the pump until there is enough pressure ------------- Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20 Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15 |
Posted By: Stan R
Date Posted: 15 Sep 2017 at 4:27pm
| What does the wiring/ wiring diagram show? Then you will know. |
Posted By: SteveM C/IL
Date Posted: 15 Sep 2017 at 6:39pm
| low press switch up front at dryer.no clutch till some pressure or jump switch to draw in Freon(make clutch run) |
Posted By: wekracer
Date Posted: 15 Sep 2017 at 7:24pm
| Did you pull a vacuum on it. The freon is under enough pressure in the tank to activate the low switch without having to jump the compressor. Just open the low valve and let it run for a minute or two. |
Posted By: Ron(AB)
Date Posted: 15 Sep 2017 at 7:35pm
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Right, I needed to jump the low pressure switch at the dryer. Thanks Everything checks! It's been a while since I did one. |