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HD5 "P" gage?

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=103122
Printed Date: 19 Jul 2025 at 5:38pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: HD5 "P" gage?

Posted By: Dandy Dave
Subject: HD5 "P" gage?
Date Posted: 12 Mar 2015 at 5:55am

4 gages in the dash. Engine oil pressure, Amps, Temp, Also a 4th gage marked "P" What is it for? Thanks, Dandy Dave!

Replies:

Posted By: Coke-in-MN
Date Posted: 12 Mar 2015 at 8:29am

Fuel Pressure from primary pump

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: Dandy Dave
Date Posted: 12 Mar 2015 at 8:49am

OK, That makes sense. Cat had them on the Fuel filter housing on the older machines. This HD5 belongs to a buddy that is about 800 miles south of me so I could not just stop over and look. Thanks, Dandy Dave!

Posted By: Coke-in-MN
Date Posted: 12 Mar 2015 at 9:24am

The original gauge has a diaphragm on it and also a snubbed restriction so gauge will not show pulses from the gear pump and flow to injector pulses .

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."