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CA Hydraulic/Transmission Oil

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=208707
Printed Date: 30 Oct 2025 at 7:14am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com


Topic: CA Hydraulic/Transmission Oil
Posted By: dfwallis
Subject: CA Hydraulic/Transmission Oil
Date Posted: 29 Oct 2025 at 12:26pm
CA recommended SAE 10W <40f, 20W >40f

I bought hydraulic fluid at NAPA, showed them a picture of the 10W20 product I wanted, paid, but they brought out a 30W product and put it in the car.  I didn't pay attention that they didn't give me what I asked for.  Anyway, the pump works well but sometimes it takes a while longer than desired to prime.  Nobody uses SAE oil ratings for hydraulic fluid any more, and it's not clear what the best ISO grade to use is:

SAE 10 weight viscosity:  45mm**2/s at 40C, 7.0mm**2/s at 100C
SAE 20 weight:  61mm**2/s at 40C, 8.5mm**2/s at 100C
ISO 32 weight:  32mm**2/s at 40C, 5.5mm**2/s at 100C
ISO 46 weight:  46mm**2/s at 40C, 7.0mm**2/s at 100C
ISO 68 weight:  68mm**2/s at 40C, 9.5mm**2/s at 100C

None of the ISO ratings match the original specs.  I don't suppose those were too precise.  I'm inclined to go with ISO46AW.  But that seems to equate more closely to a SAE 10 weight.  Hopefully, the "AW" additives will help make up for any differences.  yes/no?

Why are they rating these at 40C??? that's 104F (and 212F).


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1952 CA13092



Replies:
Posted By: Les Kerf
Date Posted: 29 Oct 2025 at 1:26pm
Considering the 'relatively' light work your CA will likely see in Texas, I would use the ISO 32. If you intend to cultivate cotton in 95 degree heat for 12 hours at a time then use the ISO 46.

The ISO 32 works perfectly in my somewhat cooler climate here in northern Idaho, ISO 46 is somewhat sluggish.


Posted By: Dennis J OPKs
Date Posted: 29 Oct 2025 at 1:46pm
I have used straight 30w non-detergent in KS, not zero temps and it works fine.


Posted By: DrAllis
Date Posted: 29 Oct 2025 at 5:34pm
Why wouldn't one use 821XL/PermaTran/HyTran/HyGard ???  All readily available and correct everything mixed in.


Posted By: dfwallis
Date Posted: 29 Oct 2025 at 5:41pm
Originally posted by Dennis J OPKs Dennis J OPKs wrote:

I have used straight 30w non-detergent in KS, not zero temps and it works fine.

At some point, AC added a check valve in the inlet, presumably to improve priming.  1952 doesn't seem to have a check valve/ball.  It's a minor problem, but sometimes it can take 10-15 seconds (or longer if its cold) before it starts to pump, usually on a fresh startup.  May be a combination of wear and oil viscosity.  With thicker oil, it was nearly impossible to get it to prime.


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1952 CA13092


Posted By: dfwallis
Date Posted: 29 Oct 2025 at 5:44pm
Originally posted by DrAllis DrAllis wrote:

Why wouldn't one use 821XL/PermaTran/HyTran/HyGard ???  All readily available and correct everything mixed in.

That's roughly what it has in it (821Xl compliant).  That's roughly 10W30 and it has trouble priming sometimes.


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1952 CA13092


Posted By: dfwallis
Date Posted: 29 Oct 2025 at 6:05pm
Originally posted by Les Kerf Les Kerf wrote:

Considering the 'relatively' light work your CA will likely see in Texas, I would use the ISO 32. If you intend to cultivate cotton in 95 degree heat for 12 hours at a time then use the ISO 46.

The ISO 32 works perfectly in my somewhat cooler climate here in northern Idaho, ISO 46 is somewhat sluggish.

The tractor is in Indiana.  It will have a relatively easy life for the foreseeable future.  It may on occasion do some plowing/discing.  My brother is eyeing it for his garden.   It may be used for some brush hogging if I get the smaller one working, but mostly finish mowing.


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1952 CA13092



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