Farm Equipment - Model C Lubrication Questions

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Model C Lubrication Questions

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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=143165
Printed Date: 18 Jul 2025 at 8:06pm
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Topic: Model C Lubrication Questions

Posted By: Injnray
Subject: Model C Lubrication Questions
Date Posted: 06 Oct 2017 at 8:50am

Just got my 1st tractor, a 1942 AC Model C with original 6V electric start and PTO w hydraulics. 3 questions about lubrication.

1. How do I lubricate the generator and starter motor, as the original AC service manual says to do? (It doesn't explain how to do it.)

2. Is it OK to use 10W30 syntheic oil in this tractor, or should I stick with 10W30 conventional oil?

3. Should I use the SAE 20W oil in the transmission and shared sump that the manual specifies, or should I use a special shared sump oil that Chris Pratt recommends in his "The Little ACs" book?

Thanks for your patience with this tractor newbie. I want to do what is best for this tractor and so will appreciate help from those of you who are more expert about these things.

Injnray

Replies:

Posted By: steve(ill)
Date Posted: 06 Oct 2017 at 9:11am

look at the generator and see if there are two small oil "cups" on each end that you can drip 1-2 drops of oil into for the bearings. MOST starters do not have lube points... I would use CONVENTIONAL 10w 30 oil in the motor.. Transmission can be 20 wt, but MOSWT people these days use Universal Tractor FLuid. You can get a 5 gallon bucket at the Farm store for $25-30. Normally it will say UTF or JD 303... Similar to the old AC spec.

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

Posted By: CrestonM
Date Posted: 06 Oct 2017 at 9:19am

I tried finding some 20 wt in Hutchinson for my Super 100, and that stuff must be non-existent these days...I tried 4 places, and nobody carries it or had heard of it.

Posted By: Hubert (Ga)engine7
Date Posted: 06 Oct 2017 at 10:10am

10W40 in the engine and universal hytrans in the transmission/hydraulics, few drops of oil for each end of the generator. You will have to pull the starter to lube it. I use dry film lube on the starter bendix, put too much oil on it and it will collect dirt and start sticking.

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Just an old country boy saved by the grace of God.

Posted By: Gerald J.
Date Posted: 06 Oct 2017 at 10:12am

I don't know any reason not to use synthetic oil except for cost. It should last a lot longer than conventional oil and lubricate as well. It does tend to find slight leaks and to leak more than conventional oil in my experience.

As for generator and starter lubrication there should be details in the shop manual I have on line for, B,C, G, and CA at;
http://geraldj.networkiowa.com/Trees/Allis-Chalmers-G-B-C-CA-Service.pdf" rel="nofollow - http://geraldj.networkiowa.com/Trees/Allis-Chalmers-G-B-C-CA-Service.pdf

Gerald J.

Posted By: DougS
Date Posted: 06 Oct 2017 at 10:13am

What Steve said. You don't want detergent oil in the hydraulics either.

Posted By: Injnray
Date Posted: 08 Oct 2017 at 9:13pm

Thanks to all who replied to my lubrication questions.

I pulled the filler plug on the transmission/PTO shared system today and found it filled to the edge of the filler plug opening, which is good. The fluid is kind of a hazy goldish color.

Is this the proper color for the fluid you guys recommended in your answers to my lubrication questions?

Posted By: mdm1
Date Posted: 09 Oct 2017 at 6:07am

I put semi-synthetic oil in my WD-45. Great way to find leaks! Never again.

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Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!