Farm Equipment - Filters ???

Filters ???

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=204471
Printed Date: 28 Jul 2025 at 4:55pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Filters ???

Posted By: Ray54
Subject: Filters ???
Date Posted: 09 Dec 2024 at 12:09pm

There are questions fairly often about filters. From one that is current what is different about engine oil, hydraulic oil, and fuel filters. I understand full flow and by pass, what other difference really matter.

Back before everything went computer, I remember the big master cataloged of filters Wix, Baldwin and others had. They had generic listings you could start with how fine you wanted to filter it by Microns. The thread pitches and size, and the fiscal size of the filter.

I have a AC HD 5 crawler. It had 2 matching canister filters. One engine oil, the other primary fuel filter. ( Confused

For some unknown reason some old filter numbers are imbedded in my brain, others NO CLUE.) It came when others made all real discissions. We always used the same Fram CP 1 filter in both. After I was buying filters, a helpful person at fuel and oil distributor got the BOOK out and tells me I could use finer micron filter to better filter the fuel.

So as per the other filter question of today. Someone looking for a hydraulic filter, a dealer only item. Well some comes up with a "WILL FIT" number that is listed as engine oil filter. Other than micron size of filtering agent what would be different?

Replies:

Posted By: steve(ill)
Date Posted: 09 Dec 2024 at 4:53pm

other than micron size and thread size, and O-ring location..... the only thing to worry about is the pressure rating.... Most filters will be adequate and interchange if the thread size and micron size are OK..... I have done that on some industrial equip..

some filters have an internal BYPASS.. if the filter gets restricted, the valve opens and allows the oil to bypass the filter element so you dont cavitate or backpressure the pump... some do not bypass internally.... engine filters might be on the PRESSURE side and run 20- 60 psi....hydraulic systems run 3000 psi, so MOST of the hydraulic filters are on the SUCTION side of the pump ... or return line of the hydraulics.

-------------
Like them all, but love the "B"s.

Posted By: acken
Date Posted: 09 Dec 2024 at 7:18pm

I have installed high pressure hydraulic filters a number of times. Never seen any in spin on, canister only, and the filter housing was very substantial.

Posted By: steve(ill)
Date Posted: 09 Dec 2024 at 7:51pm

Correct--- here is GOOGLE

AI Overview

https://support.google.com/websearch?p=ai_overviews&hl=en" rel="nofollow - - Learn more

The maximum pressure a typical spin-on oil filter can handle is usually around 150 to 200 PSI (pounds per square inch), depending on the specific filter design and manufacturer; however, it's important to consult the filter's specifications for the exact pressure rating.

Key points to remember:

Normal engine oil pressure:
Most car engines operate at an oil pressure between 40 and 60 PSI, so the filter should easily handle this range.
Pressure surges:
Even though the normal operating pressure is lower, the filter may experience temporary pressure spikes during engine start-up or heavy acceleration.
Bypass valve:
Most oil filters have a bypass valve that opens if the pressure drop across the filter becomes too high, preventing damage to the filter or engine.

-------------
Like them all, but love the "B"s.

Posted By: Coke-in-MN
Date Posted: 10 Dec 2024 at 10:54am

If you dig a little with search engine there are a lot of cross reference charts online
Found the filter for my Moto Guzzi Jackal is same filter used on my Norton Commando and it interchanges to many European cars .
Just going through a filter search for my AC 715B TLB- for hydraulic system .
Even on that machines engine - they do not list the PH8A filter for Perkins 4-236 but that is what I use .
On my HD5 I made up my own base filter plate and now use the PH8A on it as both fuel and oil filter instead of the old cartridge style - which interchanged with 1952 Chrysler 6 cyl engine bypass filter

The pressure relief is one setting as is the anti-drain back feature for position filter is mounted in .

-------------
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."