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AC 7GB

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=32479
Printed Date: 27 Jun 2025 at 9:54am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: AC 7GB

Posted By: Larry F
Subject: AC 7GB
Date Posted: 19 Jun 2011 at 1:37pm

My AC7GB hydraulic pump for the bucket and rippers has a vent fitting. This hole constantly leaks fluid. I even attached an extension of 3 feet to this fitting. It pushed fluid up to the top of the extension which was above the hydraulic tank by about a foot. The amount of fulid that comes out is about a pint a day even when the machine is not running. I can not understand why the fluid keeps comming out when the machine is not running. The bucket has plenty of power so there does not seem to be a problem with the pump power. Is there suposed to be a releif valve at this vent ? Any help will be appericated. Thank you. Larry

Replies:

Posted By: dadsdozerhd5b
Date Posted: 19 Jun 2011 at 7:16pm

some hydraulic pumps have a return fitting to the tank for leakage inside the pump. it may be to tell you there is internal leakage. you coould just pipe it to the tank and forget about it.

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HD5B, HD5G, (2) FARMALL A's, CUB. DO IT RIGHT THE FIRST TIME, IGNORE THE LAUGHTER. FLANNEL IS ALWAYS IN STYLE.