Yesterday's Tractor Co. Shop Now
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
Classified Ads
Photo Ads
Tractor Parts

Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs

Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
Tool Talk Discussion Forum

Re: Air operated vacum pump ?

[Show Entire Topic]  

Welcome Guest, Log in or Register
Author  [Modern View]

06-02-2013 04:14:14

Report to Moderator

I have done AC work off and on for over 25 years and never had a problem with a system evacuated with my air operated pump. The water will boil in a vacuum as long as you are not doing a repair in extremely cold weather it will boil out. Do a good repair by flushing system and replacing dryer/accumulator then run your pump long enough there should be no problems. One of the biggest problems I have seen is people pull the vacuum on them and call it good, they don't leave it on there long enough to boil out any moisture.

[Log in to Reply]   [No Email]

06-02-2013 07:41:24

Report to Moderator
 Re: Air operated vacum pump ? in reply to tom-ky, 06-02-2013 04:14:14  
Tom, I agree that if you wait long enough, even one of the venturi vacuum pumps will dry out a system. But who really wants to have their air compressor running non-stop for the four or five hours it will take?

Let's assume your venturi will pull down to 28.5 inches/30,000 microns (which is probably generous). The boiling point of water is about 90 degrees F at that temperature. If it's a hot day, that venturi will do a reasonable job of drying the system. Not great, but good enough. But if it's a cool day, it is simply not going to work. To boil water at 70 degrees, you need to get below 20,000 microns, and it's absurd to think you can do that with a venturi. Given that even a garbage HF vacuum pump will pull down to 100 microns, it's really not worth it to use a venturi. The pump will do a better job faster, and use much less electricity.

[Log in to Reply]  [No Email]

06-02-2013 07:51:58

Report to Moderator
 Re: Air operated vacum pump ? in reply to MarkB_MI, 06-02-2013 07:41:24  
Quoting Removed, click Modern View to see

Mark, I agree if I was going to do more AC work I would buy one of the HF pumps. My MAC pulls over 29" on the gauge. If I have replaced the dryer and flushed the system once it gets done to the lowest reading I generally run a hour or less, my AC training only suggested 30 minutes. Like you said there would be a big difference in electricity usage, even a HF pump would pay for itself instead of hiring out a job if a person is capable of doing the job.

[Log in to Reply]  [No Email]
[Show Entire Topic]     [Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:

Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a company you can trust and have generous return policies. Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ About Us ]

Home  |  Forums

Copyright © 1997-2018 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters