Farm Equipment - B power unit pump

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B power unit pump

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=173914
Printed Date: 07 Oct 2025 at 1:53pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: B power unit pump

Posted By: allis g
Subject: B power unit pump
Date Posted: 28 Aug 2020 at 5:37pm

I am finally getting around to the B Power unit. It came off of a lettuce picker many years ago from a farm in the Santa Maria valley in California. question is, there is what looks like an extra oil pump on the side of the engine behind the oil filter. It has a wire out of the top that goes to the kill switch on the magneto there is a rotating piece on top of that and 1/8" lines tee'd into the oil line for the oil filter. Am I correct that it is an oil pump and what is the correct name for it? What does the rotating piece do? It is made of brass. any idea where to get some kind of instructions for it. Thanks all for the help

Replies:

Posted By: Boss Man
Date Posted: 28 Aug 2020 at 9:10pm

The fact that there's a wire going to the mag would make me think its some kind of murphy switch that shuts the engine down if the oil pressure drops.

Posted By: allis g
Date Posted: 29 Aug 2020 at 12:23am

thanks ill start there