Garden Tractors - 720 Gas Cap

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720 Gas Cap

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Garden Tractors
Forum Description: A great place to discuss the Simplicity and Allis Chalmers Garden Models
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=203179
Printed Date: 24 Nov 2024 at 5:18am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 720 Gas Cap

Posted By: Dave (NE)
Subject: 720 Gas Cap
Date Posted: 13 Sep 2024 at 8:17am

For some reason, over the past several months the gas cap on my 720 will not easily come off as it used to. I have to use considerable pressure to lift and remove it. Yes, the nob parts on the cap are lined up with the notches in the neck of the tank, so that is not the issue. Any ideas? Thanks, Dave

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Do not argue with an idiot. He will drag you down to his level and beat you with experience. Mark Twain.

Replies:

Posted By: AC720Man
Date Posted: 19 Sep 2024 at 9:11pm

It may be the gasket sticking? My 720 would be running fine and then shut off. 20 minutes later it would start and run for 5 minutes and shut off. I lifted the hood and noticed the tank sides were sucked in. Removed the cap and the tank took a big breath of fresh air and the tank sides returned to their normal shape. Replaced both of my 720 caps with one with a gauge . Problem solved.

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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD

Posted By: Dave (NE)
Date Posted: 19 Sep 2024 at 9:30pm

Yeah, its like the cap shrunk up or something. Hot or cold, it doesn't want to easily come off. Crazy thing!

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Do not argue with an idiot. He will drag you down to his level and beat you with experience. Mark Twain.

Posted By: Herb(GA)
Date Posted: 20 Sep 2024 at 8:07am

I have filed the outside of the tank opening to reduce this tight fit. First, to be on the safe side I plugged the tank opening with clean rag. Herb(GA)

Posted By: Dave (NE)
Date Posted: 20 Sep 2024 at 8:11am

Yeah, I was thinking about doing that on the outside of the tank. Or, perhaps a wire wheel in my drill and do the inside of the cap.

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Do not argue with an idiot. He will drag you down to his level and beat you with experience. Mark Twain.

Posted By: Gary (sw Wis.)
Date Posted: 21 Sep 2024 at 7:43am

If it's plastic you might try leaving it off for a month or so. Remove it completely not just loose, need to get it away from the gas. That works on chain saw caps.

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190XT - D17 - D14 - WD45 w/loader - WD - (2)B110 - 616H - 610 - B-208 - WD with 190 Mounted Corn Picker - All Crop 60

Posted By: Dave (NE)
Date Posted: 21 Sep 2024 at 8:33am

Yes, it is plastic. So, keeping it away from the gas fumes will let it expand back out?

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Do not argue with an idiot. He will drag you down to his level and beat you with experience. Mark Twain.

Posted By: Gary (sw Wis.)
Date Posted: 21 Sep 2024 at 4:46pm

Yes, I do it with chain saw caps all the time. The chain saw cap fit inside the tank and your mower cap go over the neck but I think it's worth a try.

One more thought is the tank plastic? If so it may have expanded.

I would like to know if it works.

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190XT - D17 - D14 - WD45 w/loader - WD - (2)B110 - 616H - 610 - B-208 - WD with 190 Mounted Corn Picker - All Crop 60

Posted By: Dave (NE)
Date Posted: 21 Sep 2024 at 5:29pm

Tank is not plastic.

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Do not argue with an idiot. He will drag you down to his level and beat you with experience. Mark Twain.